Category: Class 7

Balbharti Maharashtra State Board Class 7 English Solutions Chapter 1.2 Odd One In Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 7 English Solutions Chapter 1.2 Odd One In

Class 7 English Chapter 1.2 Odd One In Textbook Questions and Answers

1. Read aloud the conversations in the story turn by turn.

Question 1.
Read aloud the conversations in the story turn by turn.

2. Write about Malti and Rima using the following points:

Question 1.
Write about Malti and Rima using the following points:

Use details from the story and your own imagination when you write the above descriptions.
Answer:

Points		Rima
Appearance	Simple, oily hair, long skirt	Stylish.
Studies	Studious, intelligent, scored well in studies. She was good at Maths.	She was also good in studies.
Singing	She had a melodious and well-trained voice. She wins the first prize in the Inter­house singing competition.	She was also good at singing and wins the first prize in her own category in the Inter­house singing competition.
Attitude Towards Others	Helpful and respectful. Ready to learn from others and improve.	Rude, arrogant, unkind behaviour. She didn’t like to be corrected.
Weak Points	Her English was poor.	She was weak in Hindi. She was jealous of others and thought others to be inferior to her.

3. Imagine you are Malti. Write any one event in the story from Malti’s point of view.

Question 1.
Imagine you are Malti. Write any one event in the story from Malti’s point of view.
Answer:
Yesterday, I was absent from school. I decided to ask Rima and other classmates about the lessons taught by teachers. As soon as I uttered “I wanted to aks you about English assignment”, Rima and her friends burst out laughing. At first I didn’t understand why they were laughing. Then Rima started mocking at me, repeating the word ‘aks’.

Other girls giggled and looked at me with contempt. I felt very bad but I requested Rima to teach me English as she was good in English and its pronunciation. But she told me rudely that as I belong to the countryside, I am incapable of speaking proper English. There was a lump in my throat as I could not bear this humiliation. I wanted to retort but I couldn’t find the right words. I burst into tears and decided to run away from there.

4. How do you behave with your classmates? Write about your attitude and behaviour in the appropriate column:
(Some actions: Ask others for help, Refuse help, Judge others by their appearance, Judge others by their accent)

Question 1.
How do you behave with your classmates? Write about your attitude and behaviour in the appropriate column:
(Some actions: Ask others for help, Refuse help, Judge others by their appearance, Judge others by their accent)

Answer:

Always	Sometimes	Never
I help others.	I am sometimes grumpy towards my friends.	I am never judgemental.
I share my tiffin with my friends.	I enquire about the health of a sick classmate.	I never use harsh words.
I always respect others.	I sometimes visit NGO’s to volunteer.	I never misbehave in class.

Note: Students do the exercise based on their own individual behaviour.

5. Talk about: (a) your strengths (b) your weaknesses (c) the changes that you would like lo see in yourself (3 each).

Question a.
Your strengths:
Answer:
My biggest strength is my willingness to learn and improve myself. I am very polite and humble. I am also a good listener due to which I make friends very easily.

Question b.
Your weaknesses:
Answer:
I am lazy when it comes to doing homework.
I have a phobia of speaking in front of a large group. This has developed into stage fright. I also can’t stop eating once I start. This makes me fall sick very often.

Question c.
The changes that you would like to see in yourself:
Answer:
I would like to get rid of my laziness. I want to start cultivating the habit of reading to improve my language. I would like to participate confidently in competitions. And lastly I want to control my diet for a healthy living.

6. Discuss: Is it necessary to develop a good accent? Why? What efforts can you take to improve your pronunciation? With your teacher’s help, find out how to use online dictionaries for the purpose.

Question 1.
Discuss: Is it necessary to develop a good accent? Why? What efforts can you take to improve your pronunciation? With your teacher’s help, find out how to use online dictionaries for the purpose.
Answer:
Yes, it is extremely necessary to develop a good accent because it aids in communication. A proper accent is important to understand and be understood. I can refer a dictionary that provides pronunciation key. I can also listen to news channels such as BBC that helps us to speak English the way the natives do. Besides, no matter what the language, avoiding the influence of mother tongue can help improve pronunciation.

7. list all the adverbs that end with ‘-ly’ from the passage.

Question 1.
list all the adverbs that end with ‘-ly’ from the passage.
Answer:

1. quietly
2. rudely
3. cattily
4. uncharitably
5. sadly
6. snidely
7. abundantly
8. readily
9. cheerfully
10. mercilessly
11. particularly
12. roundly
13. badly
14. stubbornly

8. Language Study:

Question 1.
Types of nouns: You know that a noun is a word used as the name of a person, place or thing. The names given to particular persons, places, animals etc. are proper nouns and the rest are common nouns. For example, ‘Ria’ is a proper noun, because it is the name of a particular person. But, ‘girl’ Is a common noun, as It is not the name of a particular person. ‘Ahmednagar’ Is a proper noun, because it is the name of a particular place. ‘Town’ Is a common noun, because it is not the name of a particular place.
Answer:

Write at least 5 common nouns and 5 proper nouns each. Proper nouns are always written with a capital letter at the beginning. Can you think of proper nouns that include two or more words? How are they written? Find at least ten such nouns.
Examples: Seva Hospital, The Times of India.

Class 7 English Chapter 1.2 Odd One In Additional Important Questions and Answers

Answer the following questions.

Question 1.
Complete the web.
Answer:
i.

ii.

Question 2.
How did Rima and her friends try to offend Malti?
Answer:
Rima and her friends tried to. offend Malti by asking her about the oil on her hair and her long skirt.

Question 3.
Guess what Malti was about to say when the teacher entered?
Answer:
When the teacher entered, Malti was about to probably justify why she wore long skirt or oiled her hair.

Question 4.
What did Rima and her gang decide to do during the Inter-house singing competition? Did they succeed? Why?
Answer:
Rima and her gang decided to jeer when Malti sang but they did not succeed as there was such absolute silence that they did’not dare to do so. They were sure to get caught if they did

Question 5.
Why did Rima feel no joy even though she came first in her category?
Answer:
(Rima had thought that Malti must be a miserable singer and would lose in the singing competition but Malti won the first prize. Rima felt no joy even though she came first in her category as she was proved wrong and may be she even felt jealous of Malti.

Question 6.
Why did Rima walk off in a huff?
Answer:
Rima’s friends told her that she was rude to Malti. This shocked Rima as her own friends had turned against her. So, she walked off in a huff.

Question 7.
What would you have done if you would have been in Malti’s place?
Answer:
If I would have been in Malti’s place, I would have done exactly what Malti did. I would have let my work and performance speak for myself. I would have also tried to befriend Rima by helping her or praising her for her strengths.

Question 8.
Write a character sketch of Rima.
Answer:
Rima was a school-going girl who had her own clique of stylish girls. She was quick to judge people by their outward appearance. She was a bit of a snob who didn’t hesitate to comment on Malti’s oily hair. She had an envious nature as she wasn’t happy about Malti winning the first prize although she herself had also won the first prize in her own category. She thought herself to be far more superior as she was city-bred and could speak good English. She was too proud to accept her mistake when her friends pointed it out to her.

Question 9.
Discuss the meaning in the context of the story.
Answer:

1. befriended (v) – became friends
2. snob (n) – criticizing people coming from lower social class or are less education
3. forte (n) – something one is good at
4. belied (v) – failed to give a true impression or to tell lie
5. smart (adj) – intelligent, clever
6. confident (adj) – feeling or showing confidence in oneself or one’s abilities or qualities or being sure about ones abilities.
7. insufferable (adj) – intolerable

Reading Skills, Vocabulary and Grammar

Read the following passage and do the activities.

Simple Factual Questions:

Question 1.
Fill in the blanks:
i. “Any new girls in your class?” enquired her father …………. .
ii. “She can’t speak …………. English.
Answer:
i. Mr. Sen
ii. much

Question 2.
Say whether true or false and correct in case the statement is false.
Rima can’t speak much English.
Answer:
False. Malti can’t speak much English.

Complex Factual Questions:

Question 1.
How did Rima describe Malti to her father?
Answer:
Rima described to her father that Malti was a funny girl from a state at the other end of the country who could not speak much English. She also added that Malti came with oily hair and a bindi and spoke with a strange accent.

Question 2.
Do Rima and her parents share the same attitude?
Answer:
No, Rima and her parents do not share the same’attitude. The parents confront Rima with reality. We know that because Rima’s parents defend and praise Malti when Rima criticizes her.

Vocabulary:

Question 1.
Guess the meanings of the following words in the context of the story
Answer:

• settling in (v) – to arrange oneself comfortably in
• sniffed (v) – drew in air audibly to show dislike
• mimicked (v) – imitated the voice and behaviour
• grimaced (v) – made a twisted expression on face to express disgust.

Grammar:

Question 1.
Write at least 4 Proper nouns from the above passage.
Answer:

1. Rima
2. Mr. Sen
3. Malti
4. English

Question 2.
Write at least 4 Common nouns from the above passage.
Answer:

1. mother
2. day
3. girls
4. school

Personal Response:

Question 1.
Have you ever been a victim of bullying in your class? How did you tackle it?
Answer:
Yes, I have been a victim of bullying in my class due by a handful of bullies in the class. They used to call me ‘teacher’s pet’ and tease me. Initially I was annoyed. But with the help of my parents and teachers I began to help one of the weaker students who used to bully me. In the first semester his grade were raised and he became fan and strong supporter. Eventually the others also realized their mistakes and accepted me as a friend and took my help to improve.

Question 2.
How did Rima decide whether or not Malti was smart? What is your opinion?
Answer:
Rima decided Malti’s smartness by the way she dressed and spoke English. I do not think that we should judge someone’s smartness by their outward appearance. Besides, even if someone does not speak good English, it cap always be learnt and improved upon, and the person may be very good at some other language.

Question 3.
Do Rima and her parents share the same attitude? How do we know that?
Answer:
No, Rima and her parents do not share the same opinion. We know this from the conversation between Rima and her parents. The mother feels that Malti is a clever girl for she raised her hand to answer all questions in the class. When Rima said that Malti’s English is bad and she isn’t clever, her father pointed out to Rima that the same goes with her Hindi.

Read the following passage and do the activities.

Simple Factual Questions:

Question 1.
Complete the web with the names of Rina Clique friends.
Answer:

Complex Factual Questions:

Question 1.
Why was Rima sad and depressed at lunch time?
Answer:
Rima was sad and depressed at lunch time because she knew she had behaved badly with Malti but didn’t want to accept it. Besides her own friends had gone against her.

Question 2.
Which lines from the passage tell us that Malti was a very humble person?
Answer:
“I know my English is weak. Yours is good. Please, will you help me to improve it?” These lines tell us that Malti was very humble.

Vocabulary:

Question 1.
Give the antonyms of:
1. proud
2. mercilessly
Answer:
1. humble
2. mercifully, compassionately

Grammar:

Question 1.
Her own friends had turned against her.
(Separate the subject and predicate)
Answer:
Her own friends – subject
had turned against her – predicate.

Question 2.
Rima was shocked. (Transform into a question)
Answer:
Wasn’t Rima shocked?

Personal Response:

Question 1.
Is it necessary to accept one’s mistake? Why?
Answer:
Yes, it is very necessary for one to accept his mistake, because only when we accept our mistake will we make an attempt to improve ourselves. Besides, one must understand that we are all humans and are bound to make mistakes. What is important is to learn from the mistakes and not repeat them.

Language study:

Do as directed.

Question 1.
Write at least 5 common nouns and 5 proper nouns each.
Answer:

• Common nouns: parents, friends, table, participants, child, etc.
• Proper nouns: Rima, Malti, Saturday, English; Clare, etc.

Question 2.
Can you think of proper nouns that include two or more words? How are they written? Find at least ten such nouns.
Answer:
Proper nouns with two or more words have each word beginning with a capital letter except prepositions and articles.
(a) St. Peter’s Church (b) Marks & Spencer (c) The Retreat Resort (d) United Kingdom (e) Bank of Baroda (f) Big Bazaar (g) The United States of America (h) United Colours of Benetton (i) The Great Escape Water Park (j) Phoenix Market City Mall.

Question 3.
Match the meanings.

Column ‘A’	Column ‘B’
1. forte	a. to arrange oneself comfortably in a new place
2. belied	b. to transfer
3. befriended	c. to express contempt
4. settling in	d. fail to give a true impression of something
5. sniffed	e. intolerable
6. insufferable	f. become a friend when in need of help
	g. something one is good at

Answer:

Column ‘A’	Column ‘B’
1. forte	g. something one is good at
2. belied	d. fail to give a true impression of something
3. befriended	f. become a friend when in need of help
4. settling in	a. to arrange oneself comfortably in a new place
5. sniffed	c. to express contempt
6. insufferable	e. intolerable

Question 4.
Add a suffix to any 4 words from the lesson to make their noun forms.
Answer:

• improve – improvement
• quiet – quietness
• clear – clearance
• bright – brightness

Question 5.
Make sentences using phrases/idioms.
Answer:
Question i.
To help oneself
Answer:
She placed the bowl of dessert on the table and askeci the guests to help themselves.

Question ii.
To dote on someone
Answer:
My best friend’s mother dotes on her and buys her expensive clothes.

Question iii.
To be on the verge of something
Answer:
The differences between the two countries increased so much that they were on the verge of having a war.

Question iv.
To burst into tears
Answer:
When she saw her lost child after seven days, she burst into tears.

Question v.
To walk away in a huff
Answer:
When Hera’s friends started teasing her for her new hairstyle, she walked away in a huff.

Question 6.
Discuss the difference in the meaning of the following words:
Answer:

1. Smart – a clean, tidy, well-dressed person having quick-witted intelligence.
2. confident – a person who believes in oneself or one abilities and qualities.
3. snob – person who believes that his/her taste in a particular area is superior to those of other people.

Do as directed:

Question 1.
The teachers had liked the respectful, intelligent girl from the beginning.
(Pick out the adjectives and state their kind)
Answer:
respectful, intelligent – Adjectives of quality.

Question 2.
Malti sang beautifully.
(Pick out the verb and state whether it is transitive or intransitive)
Answer:
sang – Intransitive.

Question 3.
No one was surprised when Malti won the first prize.
(Pick out the conjunction)
Answer:
when – conjunction.

Question 4.
We put Rima into a good school to make her smart and confident.
(Pick out the preposition)
Answer:
into, to – preposition.

Question 5.
Malti answered ………………. .
(Fill in adverb of your choice to complete the sentence)
Answer:
softly, politely

Question 6.
She can’t speak much English.
(Add a question tag)
Answer:
She can’t speak much English, can she?

Question 7.
Malti looked offended but did not reply. (Replace the underlined conjunction with another conjunction without changing the meaning)
Answer:
Malti looked offended still yet did not reply.

Question 8.
Malti felt bad about their ………………….. .
(Fill in the blank with an abstract noun of your choice)
Answer:
Malti felt bad about their poverty.

Question 9.
This one does not seem smart at all.
(Change the number)
Answer:
These ones do not seem smart at all.

Question 10.
Rima did come first in her category.
(Pick out the adjective)
Answer:
first – adjective

Writing Skills:

Question 1.
Can you imagine what happened next in this story of Rima and Malti? Complete the story on your own.
The time gone by …………….
Answer:
Rima knew that she had behaved very badly. She was too proud to admit it – even to herself. Next day, after a sleepless night, Rima dragged herself to school. When she reached, her friends were already chatting with Malti. This upset her even more. Within a week or so, all her friends had befriended Malti and were all praises about her. But Rima thought otherwise.

She took it to be a wicked plan of Malti to isolate her from her friends. Rima who had always been a topper started losing confidence. This affected her performance in exams. She soon lost the affection of her teachers who thought she needed to change her rude behaviour. Rima’s health suffered and she fell sick very often. After a week’s absence from school, when she resumed, none of her friends asked her about her health.

When she asked for notes that she had missed, no one lent her the books. Rima approached the teacher and requested her to give her a week’s time to complete all the books. She also asked if she could get someone’s book to complete her notes.

The teacher send that Malti had already made notes for Rima with her permission. Rima completed all her books with Malti’s help. She was touched by this kind of gesture. She realised her mistake and apologized to Malti who embraced her. Both Rima and Malti became best of friends. Rima had learnt that beauty is skin deep.

Odd One In Summary in English

Introduction:

The lesson ‘Odd One In’ is an excerpt from the book of the same name by Tithi Tavora. Set against the backdrop of challenges encountered by a newcomer in school. The story highlights the importance of inner beauty as compared to outward appearance.

Paraphrase:

The story revolves around Rima, a city bred brat, who is quick to judge the newcomer, Malti, a countryside girl. Rima and her friends look down upon Malti for her simple looks and dressing sense. However, Malti proves her mettle to them over a period of time. Rima learns a lesson not to judge anyone by their outward appearance and be respectful to one and all. But does she really learn the lesson? Well, read the story to find more….

Glossary:

1. shrugged (v) – raised the shoulders slightly and briefly as a sign that one does not care or know about something.
2. grimaced (v) – made a twisted expression on the face to express disgust or pain or something hurting youth.
3. mimicked (v) – imitatedl the voice and behaviour
4. chorused (v) – said the same thing together
5. giggled (v) – laughed in a silly way
6. cattily (adv) – in a mean way
7. recounted (v) – narrated
8. uncharitably (adv) – in an unkind way
9. atrocious (adj) – bad
10. countered (v) – opposed
11. snidely (adv) – rudely and critically
12. abundantly (adv) – extremely
13. nimble (adj) – quick
14. clique (n) – a group of people who do not readily allow others to join
15. exaggerated (v) – altered; to make something larger than it is.
16. accent (n) – pronunciation
17. countrified (adj) – unsophisticated, simple
18. retort (v) – to reply in a short angry or witty manner
19. jeer (v) – make rude remarks a in a loud voice
20. horrid (adj) – horrible
21. roundly (adv) – completely
22. subdued (adj) – quiet and depressed

Balbharti Maharashtra State Board Class 7 Science Solutions Chapter 11 Cell Structure and Micro-organisms Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 7 Science Solutions Chapter 11 Cell Structure and Micro-organisms

Class 7 Science Chapter 11 Cell Structure and Micro-organisms Textbook Questions and Answers

1. Answer the following questions.

Question a.
What is a cell?
Answer:
The cell is the fundamental, structural and functional unit of living organism.

Question b.
Name the different organelles in a cell.
Answer:
The nucleus, endoplasmic reticulum, Golgi bodies, lysosomes, mitochondria, vacuoles, plastids, chloroplasts are the different organelles in a cell.

Question c.
What are micro-organisms?
Answer:
The organisms which cannot be seen with our eyes but can only be observed under a microscope are called micro-organisms.

Question d.
Which are the different types of micro-organisms?
Answer:
Algae, fungi, bacteria, protozoa and viruses are various types of micro-organism. Some are unicellular and others are multicellular. Some of them are useful and some are harmful.

2. Fill in the blanks with the proper word.

Question a.
The organelle called the ……………. is present in the plant cells only.
Answer:
chloroplasts

Question b.
Garbage is converted into ……….. by microorganisms.
Answer:
fertilizer

Question c.
In the cell, photosynthesis is carried out with the help of …………… .
Answer:
chloroplast

Question d.
An electron microscope is necessary for the study of ……………… .
Answer:
micro-organism

Question e.
The process of preparing their own food in presence of sunlight and chloroplast by plants cells is known as ……….. .
Answer:
photosynthesis.

3. What is the difference between us?

Question a.
Plant cell and animal cell.
Answer:

Plant cell	Animal cell
1. Plant cell has cell wall.	1. Cell wall is absent in animal cell.
2. Plant cell has definite shape due to presence of cell wall.	2. Animal cell do not have definite shape.
3. Plant cell has one big vacuole.	3. Animal cells have many small vacuoles.
4. Plant cell has chloroplast so they produce their own food.	4. Animal cells do not have chloroplast, so they cannot produce their own food.
5. Plant cell has plastids.	5. Plastids are absent in animal cell.
6. Centrosomes are absent in plant cell.	6. Centrosomes are present near the nucleus.
7. Lysosomes are absent in plant cell.	7. Lysosomes are present in animal cell.

Question b.
Prokaryotic cell and Eukaryotic cell
Answer:

Prokaryotic cell	Eukaryotic cell
1. No well defined nucleus.	1. Well defined nucleus with a nuclear membrane
2. Ribosomes are small.	2. Ribosomes are large.
3. A single length of DNA is present.	3. Several lengths of genetic materials (DNA) is present.
4. No other cell organelles are present.	4. Several organelles like mitochondria, chloroplasts, etc. are present.
5. Examples: Bacteria, blue green algae	5. Examples: Euglena, Amoeba, all plant and animal cells

4. Sketch and describe in your on words, the plant cell and animal cell.

Question a.
Sketch and describe ¡n your on words, the plant cell and animal cell.
Answer:
There are two types of cell-animal cells and plant cells. These cells contain various types of membrane beyond cell-organelles. Plant cells have a definite shape due to the presence of cell wall. Besides, unlike animal cells, plant cells contain single large vacuole. All these cells are known as eukaryotic cells. It cell has four main parts: the cell wall, cell membrane, cytoplasm and cell organelles.
1. Cell wall: The cell wall is the outermost covering of a cell. It is present only in plant cells.

2. Plasma membrane: The plasma membrane, also called the cell membrane, is a kind of thin covering, (a) It is extremely delicate and flexible, (b) It is the outermost covering of animal cells.

3. Cytoplasm: The liquid part in the cell, present around the nucleus is called cytoplasm, (a) It occupies the space between the plasma membrane and nucleus, (b) Cell organelles are scattered in the cytoplasm.

4. Cell organelles: These mainly include the nucleus, endoplasmic reticulum, Golgi bodies, lysosomes, mitochondria, vacuoles, plastids etc.

Plant cells contain chloroplasts.
(a) The nucleus is the most important organelle of the cell, (b) There is a porous double membrane around it. (c) The nucleus controls all functions of the cell, (d) The endoplasmic reticulum is a sprawling net-like organelle. Its function is to make necessary changes in the proteins produced by ribosomes and send them to the Golgi bodies, (e) Golgi bodies are made up of several flat sacs. Their function is the proper distribution of proteins.

(f) Mitochondria and plastids are organelles with double outer coverings, (g) As mitochondria produce energy, they are called the powerhouses of the cell, (h) The chloroplasts in plant cells carry out the function of photosynthesis, (i) Vacuoles help to throw out waste products of the cell, (j) Vacuoles in animal cells are small whereas there is only one large vacuole in a plant cell.

5. Explain the uses and the harmful effects of micro-organisms.

Question a.
Explain the uses and the harmful effects of, micro-organisms.
Answer:
Micro-organisms which are helpful are called useful micro-organisms.
Uses:
1. Micro-organisms present in nodules of leguminous plants, convert atmospheric nitrogen into its compounds and these compounds help to increase the soil fertility and protein content in the soil.

2. Some micro-organisms are useful in process of fermentation, making the food easily digestible and more nutritious. For producing milk products like butter, buttermilk, cheese, paneer, etc.

3. Microbes present in soil, dung etc. decompose garbage and convert into manure of best quality and surrounding is kept clean.

4. Microbes are also useful for sewage disposal. They help in decomposition of organic compounds in it.
5. Microbes are used in production of vaccines.

6. Microbes are also used in processes like tanning of skin, production of ropes and strings, from agave.
7. Some microbes use oil for their growth. Such microbes are used to clear a layer of oil floating on the surface of an ocean or lake formed due to leak or spill.

8. Farm waste, human urine and faeces, wet garbage etc. is collected and used in a biogas plant to produce biogas and fertilizer.

Harmful effects:
1. Disease producing micro-organisms are called pathogens, they are harmful micro-organisms.

2. Fungus grows on moist food, and microbes release enterotoxins into the food. Such toxins spoil the foods. Eating such spoiled food causes food poisoning i.e. loose motions and vomiting.

3. Pathogens may be present in water bodies contaminated with sewage, and dirt from surroundings, in food with flies sitting on it. If such contaminated food or water is consumed, we may fall ill with diseases like amoebiasis, typhoid, cholera, hepatitis, gastro, etc.

4. Pathogens are released in the air by a person having infection of the respiratory, sneezes or coughs. A healthy person may get infected by pathogens on breathing in the same air and contract diseases like common cold, cough, diphtheria, pneumonia, tuberculosis, etc.

5. Microbes that cause diseases like malaria, dengue, elephantiasis, yellow fever, chikunguniya, zike
fever etc. gain entry into the human body through the bite of a female mosquito.

6. Give reasons.

Question a.
Diseases spread on a large scale during periods of heavy rainfall and floods.
Answer:

1. Due to floods there is shortage of clean, safe drinking water.
2. It gets contaminated with sewage and dirt having disease causing pathogens, causing disease of alimentary canal, typhoid, cholera, dysentery.
3. Due to stagnant water, many mosquitoes breed on it and cause diseases like malaria, dengue, etc.

Question b.
There is a possibility of food poisoning if we eat stale food.
Answer:

1. Fungus grows quickly on moist and stale food. Micro-organisms grown on the food release toxic materials like enterotoxin into the food.
2. Such toxins spoil the food.
3. Eating such spoiled food may cause loose motions and vomiting. So, we should eat food which is freshly prepared.

Question c.
Soil is turned over during tilling.
Answer:

1. Tilling is done to loosen the soil in initial agricultural practice.
2. Loose soil allows the penetration of roots of the plant.
3. By turning of soil, it allows uniform mixing of manure and fertilizer.
4. It increases the fertility of soil. Seeds also germinate easily in aerated soil. Hence, soil is turned during tilling.

Question d.
Fungus grows quickly in moist or humid condition.
Answer:

1. Fungus needs water and moisture for its growth.
2. Humidity brings about spore germination and the fungus is able to grow and reproduce quickly in moist or humid condition.

Question e.
A refrigerator is used in almost every home.
Answer:

1. Refrigerator is used to keep food item in healthy condition and to keep them fresh.
2. If the food items are kept outside, they spoil very fast due to growth of micro-organisms and they make food spoiled and harmful.
3. The optimum temperature for the growth of micro-organism is 15°C to 35°C.
4. In refrigerator the temperature is kept very low. So, the food is preserved in refrigerator.

Question f.
Bread rises during baking.
Answer:

1. The process of fermentation is used in baking, for example, in making bread. Yeast is added to make the dough rise.
2. The fermentation is a chemical process of conversion of one type of carbon compound into another type of carbon compound by the action of micro-organisms.
3. Heat is generated in this process. Carbon dioxide (CO₂) and some other gases are released.
4. These gases cause an increase in volume so the bread dough rises.

Question g.
Fodder is soaked in water before offering to cattle.
Answer:

1. In dry fodder only some part of it is useful for cattle and rest is wasted.
2. When fodder is soaked in water, it sprouts.
3. So, to make the fodder more nutritious and more easy to digest it is soaked in water before offering to cattle.

7. When will you use a simple microscope and when a compound microscope?

Question a.
When will you use a simple microscope and when a compound microscope?
Answer:

1. I will use a simple microscope to magnify the objects and to see the growth of a fungi or mucor on a piece of moist bread.
2. I will use a compound microscope in Research Laboratory and high school science lab to observe micro-organisms which we are not able to see with our naked eye.

Project:

Question 1.
Visit a bakery in your area, collect information about the process of manufacture of their products and make one of them at home.

Class 7 Science Chapter 11 Cell Structure and Micro-organisms Important Questions and Answers

Fill in the blanks and rewrite the sentences:

Question 1.
………… is the fundamental, structural and functional unit of living organism.
Answer:
Cell

Question 2.
The four main parts of the plant cell are …………, …………, ………… and ………… .
Answer:
cell wall, cell membrane, cytoplasm, cell organelle

Question 3.
Plant cell contains ………… which carry out the process of photosynthesis.
Answer:
chloroplast

Question 4.
…………… are called the power houses of the cell.
Answer:
Mitochondria

Question 5.
The outermost covering of plant cell is …………. .
Answer:
cell wall

Question 6.
The outermost covering of animal cell is ………….
Answer:
plasma membrane

Question 7.
The ………… is the most important organelle of the cell.
Answer:
nucleus

Question 8.
………… is a national movement started several years ago to increase awareness about public hygiene and personal hygiene.
Answer:
Swach Bharat Abhiyan

Question 9.
The body temperature of a healthy human being is about ………… .
Answer:
37°C

Question 10.
Micro-organisms use food stuffs for their own nutrition and release toxic materials called ………. .
Answer:
enterotoxins

Name the following:

Question 1.
An instrument used to observe cells.
Answer:
Microscope

Question 2.
I control the function of a cell.
Answer:
Nucleus

Question 3.
I am like a policeman. I do not allow anything and everything to get in and out of the cell.
Answer:
Cell membrane

Question 4.
Outermost layer of the plant cell.
Answer:
Cell wall

Question 5.
Outermost layer of the animal cell.
Answer:
Cell membrane

Question 6.
I am the jelly like substance containing all the organelles.
Answer:
Cytoplasm

Question 7.
I contain thread like structures called chromosome.
Answer:
Nucleus

Question 8.
Which part of the cell contain organelles.
Answer:
Cytoplasm

Question 9.
The unit of measurement used for expressing dimension, size of the cell.
Answer:
Nanometer, micrometer

Question 10.
The power house of the cell.
Answer:
Mitochondria

Question 11.
Largest organelle in the plant cell.
Answer:
Vacuole

Question 12.
It is necessary for photosynthesis.
Answer:
Chlorophyll

Question 13.
The living substance in the cell.
Answer:
Cytoplasm

Question 14.
A group of cells.
Answer:
Tissue

Question 15.
Empty structures in cytoplasm.
Answer:
Vacuole

State whether the following statements are True or False. Correct and rewrite the false statement:

Question 1.
Cells can be easily seen with naked eyes.
Answer:
False. We can’t see cells with naked eyes, can be seen under microscope

Question 2.
A single cell can perform all the functions in a unicellular organism.
Answer:
True

Question 3.
Cell wall is present in both plant cells and animal cells.
Answer:
False. Cell wall is present only in plant cell

Question 4.
Vacuoles are not found in plant cell.
Answer:
False. Large vacuole is found in plant cell

Question 5.
Tissue is a group of dissimilar cells.
Answer:
False. Tissue is a group of similar cells.

Question 6.
Unicellular organisms have one celled body.
Answer:
True.

Question 7.
The basic living unit of an organism is an organ.
Answer:
False. The basic living unit of an organism is the cell.

Question 8.
The unit of measurement used for expressing dimension size of the cell is centimetre.
Answer:
False. It is nanometer.

Question 9.
Micro-organism cannot grow in extreme adverse conditions.
Answer:
False. Some micro-organisms can survive in extreme adverse conditions e.g. ocean floor, ice polar region, hot water spring.

Question 10.
Some micro-organisms can grow without oxygen.
Answer:
True

Question 11.
Amoeba has irregular shape.
Answer:
True

Question 12.
The process of fermentation is used for making yogurt from milk.
Answer:
True

Question 13.
Micro-organisms need an optimum temperature of 55°C to 70°C to grow.
Answer:
False. They need temperatures between 15°C to 35°C to grow well.

Question 14.
Cells with membrane bound organelles inside them are called prokaryotic cells.
Answer:
False. Cells with membrane bound organelles inside them are called eukaryotic cells.

Question 15.
Golgi bodies are the power houses of the cells.
Answer:
False. Mitochondria are the power houses of the cell.

Choose the correct word.

Question 1.
Which one of the following terms is not a part of the nucleus?
(a) ribosome
(b) DNA
(c) chromosome
(d) gene
Answer:
(a) ribosome

Question 2.
A suitable term for the various components of cell is.
(a) tissue
(b) cell organelle
(c) chromosome
(d) gene
Answer:
(b) cell organelle

Question 3.
The jelly like fluid substance present in the cells is called.
(a) protoplasm
(b) chromosome
(c) chloroplast
(d) cytoplasm
Answer:
(d) cytoplasm

Question 4.
The units of measurement used for expressing dimension size of the cell are,
(a) centimetre
(b) micrometre
(c) nanometre
(d) metre
Answer:
(c) nanometre, (b) micrometre.

Question 5.
The largest cell in the human body
(a) nerve
(b) muscle
(c) liver
(d) kidney
Answer:
(a) nerve

Question 6.
The barrier between protoplasm and other environment in animal cell
(a) plasma membrane
(b) cell wall
(c) nucleus membrane
Answer:
(a) plasma membrane

Question 7.
The term cell wall is given by
(a) Leeuwenhoek
(b) Robert Hooke
(c) Fleming
Answer:
(b) Robert Hooke

Question 8.
The cell theory was proposed by.
(a) Watsonar Cricks
(b) Schleiden
(c) Schwann
(d) Mengal Morgan
Answer:
(b) Schleiden, (c) Schwann.

Question 9.
Which of the following features will help you in distinguishing a plant cell from an animal cell.
(a) cell wall
(b) cell membrane
(c) mitochondria
(d) nucleus
Answer:
(a) cell wall

Question 10.
The gas released during the preparation of bread,
(a) O₂
(b) CO₂
(c) nitrogen
(d) sulphur oxide
Answer:
(b) CO₂

Question 11.
The structural-functional unit of life is called.
(a) cell
(b) tissue
(c) organ
(d) organism
Answer:
(a) cell

Question 12.
Which organelle is called power house of the cell?
(a) centrosome
(b) lysosome
(c) plastid
(d) mitochondria
Answer:
(d) mitochondria

Question 13.
Living substance of cell is called.
(а) cytoplasm
(b) protoplasm
(c) nucleus
(d) chromosome
Answer:
(а) cytoplasm

Give scientific reasons:

Question 1.
Mitochondria are called the power houses of the cell.
Answer:

1. Mitochondria are tiny organelles inside the cells that are involved in releasing energy from food.
2. This process is known as cellular respiration.
3. It is for this reason that mitochondria are often referred to as the power houses of the cell.

Question 2.
A compound microscope is used for observing cells.
Answer:

1. Cell are extremely minute in size.
2. We cannot see cells with naked eye.
3. An object when kept on a glass slide is magnified many times by the lenses of this microscope.
4. Hence, compound microscope is used for observing cells.

Question 3.
Cells are the basic structural units of living organism.
Answer:

1. Cells are the smallest unit from which a living organism is made.
2. A cell contains all the necessary structures which are required to carry out various biological processes.
3. A group of cells makes a tissue, which further makes an organ and many organs together make an organ system and finally organism. Thus, the cells are the basic structural units of living organism.

Answer the following in short:

Question 1.
What is a vaccine?
Answer:
Vaccine is a live micro-organism which is weak but in a very small amount, and is injected into a person so that antibodies are produced against that micro-organism.

Question 2.
What are the similarities between the Plant cell and Animal cell?
Answer:
They both have cell membrane, cytoplasm, nucleus, ribosomes, golgi bodies, mito-chondria, vacuoles and chromosomes.

Question 3.
What do micro-organisms need for growth?
Answer:
Micro-organisms need soil, water and decaying material. Temperature suitable for microbial growth is 15 to 35°C moist, humid and warm climate.

What is the difference between us:

Question 1.
Simple microscope and Compound microscope.
Answer:

Simple microscope	Compound microscope
1. It consists of single lens.	1. It consists of 2 lenses.
2. Magnification power is upto 300X	2. Magnification power is upto 2000X.
3. It uses natural light source.	3. It uses illumination as light source.
4. It is used to observe small objects.	4. It is used to observe very tiny objects or cells which we cannot see with naked eye.

Answer in details:

Question 1.
Explain the functions of organelles in a cell.
Answer:
1. Functions of cell wall: It consist of cellulose. It is present in plant cell only. It is a protective layer outside the cell membrane. It provides structural support and protection.

2. Function of cell membrane: It controls the movement of substances in and out of the cell. It protect the cell from its surrounding.

3. Function of cytoplasm: It is the jelly like liquid, it occupies space between cell membrane and nucleus. All the organelles are scattered in it.

4. Function of Nucleus: It is the brain of the cell. It directs all cell activities, and contains genetic material called chromosomes made of DNA.

5. Function of mitochondria: It is the power house of cell. It produces energy in the form of ATP from the food.

6. Vacuoles: It is the largest organelle in the plant cell surrounded by membrane. It holds material and waste. It maintains proper pressure. It helps to throw out waste products of cell.

Explain:

Question 1.
Ram ate chaat from a street hawker, when he reached home he fell ill and complained of stomach ache. What could be the reason?
Answer:

1. he chaat Ram ate from a street hawker must be contaminated with harmful micro-organism due to dirty water used in it or stale potato used in it.
2. Toxins are produced by micro-organisms in food.
3. Ram ate that and suffered from food poisoning.

Question 2.
With the help of diagram describe Prokaryotic cell.

Answer:

1. Prokaryotic cell do not have well-defined nucleus.
2. The plasma membrane, cytoplasm and nucleoid are the only components.
3. The prokaryotic cells have smaller ribosomes compared to eukaryotic cells.
4. Bacteria and blue green algae are examples of prokaryotic cell.

Question a.
Draw neat and labelled diagram of plant cell.
Answer:

Question b.
Draw neat and labelled diagram of animal cell.
Answer:

Name the types of cells shown in the diagrams.

Question 1.

Answer:

(a) A fat cell
(b) A nerve cell
(c) A sperm cell
(d) Spirogyra
(e) Red Blood cells

Try this:

Answer the following questions:

Question 1.
Keep a moistened piece of bread or bhakari in a closed box. What will you observe after 3-4 days?
Answer:

1. I will observe growth of fungus or mucor. White cotton like layer or black spots.
2. As we know fungus grows in presence of moisture.

Question 2.
Observe a drop of muddy water or water from a stagnant puddle, under the compound microscope.
Answer:

1. We will observe, living things, micro-organism, bacteria, fungi.
2. It will be swarming withbacteria,paramoecium, amoeba, ciliated bacteria and protozoa, etc.

Question 3.
Take a drop of yoghurt or buttermilk on a glass slide and observe it under a compound microscope.
Answer:

1. I will see Lactobacillus rod shapted bacteria and streptococcus spherical shape bacteria which may be in clusters.
2. Lactobacillus use lactose present in the milk and produce lactic acid which gives tangy taste to yoghurt.

Find out:

Answer the following questions:

Question 1.
Which diseases do micro-organism cause in plants and animals?
Answer:
Diseases caused by micro-organism in plants and animals are:

Plants	Animals
Cankers, Downy Mildew, Ergot, Root rot, Rust, Seed Decay, Smut, Soft rot, Wilts, Leaf spot, Crown gel, Curly top, Mosaic leaf, Yellowing of leaf etc.	Anthrax in cattle, Dysentery in monkey, Diphtheria in rabbit, Tuberculosis in cattle, Plaque in rats.

Question 2.
Why are infants vaccinated according to fixed time schedule?
Answer:
Vaccination is done to protect the child against diseases.
1. If a baby is vaccinated by true vaccine schedule, that baby will have immunity to over 14 diseases by the age of two. With the recommended schedule, babies visit their doctor 5 times in the first 15 months and receive protection against upto 14 diseases in as little as 18 shots.
2. We immunize children so young against these diseases because infancy is the time period that kids are most vulnerable to life threatening diseases.
3. It is not advisable to skip or delay vaccines as this will leave the child vulnerable to disease for a longer period of time.

Can you tell?

Answer the following questions:

Question 1.
Observe cells from various parts of plants like leaves, bark, root tips, etc.
Answer:
Question a.
Are the cells that you observed, all alike?
Answer:
No, all cells do not look alike, each one has different shape and size.

Question b.
What are their shapes?
Answer:

1. The cells of leaves, show a green pigment because of chloroplast.
2. The shape of the cell may be spherical or polygonal.
3. The shape of root tips are oval or polygonal and the cells of back are hexagonal in shape.

Question 2.
Observe the roots of the pea, bean and fenugreek plants. What could be the functions of the nodules on their roots.
Answer:

1. Micro-organisms are present in the root nodules.
2. They fix the atmospheric nitrogen and make it available for plants.

Question 3.
What happens if clothes remain damp in the rainy season?
Answer:

1. During rainy season the humidity in the air is quite high and also.
2. Due to presence of moisture in clothes it becomes breeding ground for fungus.
3. It is the favourable condition for growth of fungus.
4. We can see white cotton like growth of fungus on clothes.

Question 4.
What are the black or white spots sometimes seen on gunny bags?
Answer:
These spots are the growth of many microbes such as fungi, mucus, mold, etc.

Question 5.
Why are leather articles like purses, wallets, belts, footwear always polished before storing away?
Answer:
They are polished so as to protect them from the growth of fungus.

1. Polish creates a layer of wax on them so that moisture cannot enter from atmosphere.
2. It prevents the growth of fungus, which damages the leather.

Question 6.
What is the powdery material found on old currency notes or old rubber or paper?
Answer:

1. The powdery material is the spores of fungi.
2. All the materials like gunny bags, cotton clothes, paper, rubber, etc. are plant products and leather is an animal product.
3. In a humid atmosphere, fungi and some other micro-organisms grow on these articles and spoil or damage them.

Question 7.
Why children are vaccinated?
Answer:

1. A vaccine is produced in a laboratory with the help of microbes, that gives immunity against particular diseases.
2. Vaccine is actually a live micro-organism which is weak.
3. When injected into a person in small amount, antibodies are produced.
4. It increases the resistance power against the disease produced by that micro-organism. So, the possibility of contracting that disease is greatly reduced.

Question 8.
Try this and answer the following questions:

In pot A	In pot B
Soil + garden waste + dung + fruit peel vegetable stalks	Pieces of glass + scrap metal + plastic bags + Soil.

Question a.
Did the garbage in pot B remain unchanged.
Answer:

1. Yes, the garbage in pot B remained unchanged because micro-organisms need nutrients for their growth.
2. In pot B there was no medium for growth of micro-organisms.

Question b.
Where did the garbage in pot ‘A’ disappear? Why?
Answer:

1. Microbes present in soil, dung, etc. decompose the garbage to obtain food material.
2. As a result garbage is soon converted into manure of the best quality and our surroundings are kept clean.

Question 9.
What does your mother do to make yoghurt from milk?
Answer:

1. Few drops of yoghurt or buttermilk are mixed with lukewarm milk and it is kept at room temperature for 8-10 hours.
2. Microbes present in the drops of yoghurt quickly multiply and the milk gets converted into yoghurt. This is a process of fermentation.

Question 10.
Who discovered the process of fermentation?
Answer:

1. Louis Pasteur established that fermentation is initiated by living organisms.
2. It involves yeast microbes, breaking down molecules of complex carbohydrates into simple sugar, alcohol and CO₂.

Use your brain power!

Answer the following questions:

Question 1.
How will you know that a foodstuff is spoilt?
Answer:

1. When the food is kept for a long time it allows the growth of bacteria and fungi.
2. We can see the white layer of bacterial or fungal growth on it, it causes a typical odour, or smell, and also the food tastes sour due to presence of enterotoxins produced by fungi in the food.

Question 2.
What precautions will you take while purchasing food? Why?
Answer:

1. We will see the expiry date. If the food is kept for a long period of time, it may allow the growth of many microbes which can cause disease or food poisoning.
2. We will check for any fungal growth, any white or black spots on it.

Question 3.
Why do food poisoning incidents occur during marriage or other community feasts?
Answer:
1. During marriage feast, food is prepared in very large quantity and food may not be properly washed or if it is cooked with water contaminated, with sewage or dirt which has many disease causing microbes, or the people handling the food may be having dirty hands

2. Also the utensils used for cooking and storing food may be dirty, contaminated with dirt and may produce microbes. The consumption of such food is responsible for food poisoning.

Question 4.
How do the cells acquire definite shapes?
Answer:
The cells acquire definite shapes due to the presence of cell wall.

Question 5.
How are cells protected?
Answer:

1. Plant cells are protected due to presence of cell wall.
2. Animal cells are protected by the double plasma membrane.

Question 6.
What are the needs of cells?
Answer:

1. The most important things for a cell are oxygen and glucose.
2. Cell uses these during process of glycolysis and makes ATP which is energy source.

Question 7.
Can the point of a needle accommodate micro-organism?
Answer:
Yes, they are smaller than the point of a needle.

Question 8.
Why should dry and wet waste be collected separately?
Answer:

1. Dry waste consist of plastic, glass, metals, paper, etc. It is easier to segregate dry waste so that it is easier for treatment and recycling of waste.
2. Wet waste consists of organic matter. Wet garbage is converted into manure of the best quality and surroundings are kept clean.

Question 9.
Why is yoghurt mixed in the batter or dough for making rava-idli, butter naan?
Answer:

1. The microbes present in yoghurt are allowed to grow in batter or dough.
2. They break down these substances producing new compound and gases are released as they grow and multiply in them which allows the batter, dough to rise.
3. This process is called fermentation.
4. This makes the food soft and nutritious.

Question 10.
How do preparation like yoghurt, idli, dosa become easy to digest?
Answer:
Fermentation does detoxification and splits complex carbohydrates and proteins into simple ones. Thus, making it easy to digest.

Question 11.
What is the co-relation between the normal body temperature of humans which is 37°C and the optimum temperature for the growth of micro-organism, 15 °C to 35 °C?
Answer:

1. Each micro-organism needs a specific environment for growth and reproduction.
2. Optimum temperature for the growth of micro-organism is 15°C to 35°C.
3. Normal body temperature of human body is 37°C. At that temperature micro-organism can not grow and cause disease.

Question 12.
How do micro-organism survive the adverse conditions?
Answer:

1. During adverse conditions micro-organisms form a thick covering around themselves and stop their life processes.
2. On return of favourable conditions they come out of the protective covering and continue their life processes.

Balbharti Maharashtra State Board Class 7 English Solutions Chapter 1.1 Past, Present, Future Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 7 English Solutions Chapter 1.1 Past, Present, Future

Class 7 English Chapter 1.1 Past, Present, Future Textbook Questions and Answers

1. Read the poem aloud using proper rhythm and intonation.

Question 1.
Read the poem aloud using proper rhythm and intonation.

2. Link the items in the three columns properly.

Question 1.
Link the items in the three columns properly.

Answer:

A	B	C
The past	A soft and mild autumn evening	A pleasant time which has ended
The present hour	A green and flowery spray where a young bird sits	A time, full of life in which you gather strength
The future	A sea beneath a cloudless sun	An exciting, thrilling time which has no end

3. Find the meaning of the following words.
thee, mournfully, spray, mighty

Question 1.
Find the meaning of the following words.
thee, mournfully, spray, mighty
Answer:

• thee – you (archaic/old usage)
• mournfully – sadly
• spray – a flowering branch
• might – physical strength

4. WrIte the adjectives that are used to describe the following.
evening, spray, sea

Question 1.
Write the adjectives that are used to describe the following.
Answer:

• evening – soft, mild
• spray – green, flowery
• sea – mighty, glorious, dazzling

5. Write one line about each of the following with the help of the poem.

Question 1.
Wind in the autumn evening
Answer:
It sighs expressing sadness.

Question 2.
Young bird on the spray.
Answer:
Sits on the flowery branch gathering all its physical and mental strength to explore the blue sky.

Question 3.
The Sea.
Answer:
Vast is the sea beneath the cloudless sun and as it stretches endlessly, it displays might, glorious and dazzling beauty.

6. Language Study:
A simile Is an imaginative comparison of two different things which have something in common. A simile always includes the words ‘as’ or ‘like’. For example: as tall as a tree, as lovely as a flower A metaphor is an imaginative expression that refers to someone/something as another person/thing. It shows thai the person or thing has some quality of that other person or thing. The words ‘as’ or ‘like’ are not used in a metaphor. For example : He is a gem of a person. Time is money. Books are our friends. The clouds are white sheep.
There are three metaphors in the poem. Can you find them?
Answer:
The three metaphors are:
Question i.
‘What is the past like to thee?
An autumn evening soft and mild’
Answer:
Here the past is compared to an autumn evening.

Question ii.
’Tell me, what is the present hour?
A green and flowery spray.’
Answer:
Here the present is compared to a green and flowery spray.

Question iii.
’And what is the future, happy one?
A sea beneath a cloudless sun.’
Answer:
Here the present is compared to a sea beneath a cloudless sun.

Class 7 English Chapter 1.1 Past, Present, Future Additional Important Questions and Answers

Answer the following questions:

Question 1.
What is the central idea of the poem?
Answer:
The central idea of the poem is the child’s definition of different periods of time which is presented in the form of a dialogue between the poetess and the child.

Question 2.
What does the past stand for according to the child?
Answer:
According to the child, the past was a pleasant time but they are moments which cannot be revisited as they would never return back.

Question 3.
How does the child define the present time?
Answer:
For the child, the present is a time where he/she
prepares for the future which is unknown, but also exciting so it is the time to gather strength.

Question 4.
How is the present moment viewed with optimism by the child?
Answer:
The child compares the present time to a green and flowery branch on which a bird is all set to take off and explore the unlimited possibilities which awaits it.
This tells us that the present is something which is viewed with optimism by the child as he believes that once we gather strength, nothing is impossible.

Question 5.
How do you define time?
Answer:
According to me, time is the most precious gift we possess. It is up to us to make utmost use of it. We should plan and prioritise to make use of most of the time in hand.
How true is the Estonian proverb!
“Wasting time is robbing oneself”

Reading Skills and Poetic Device

Read the following extract and do the activities.

Simple Factual Questions:

Question 1.
Fill in the blanks with any four describing words from the extract.
Answer:

Question 2.
Choose the correct alternative and complete the sentence:
For the child in the poem the past was
i. a pleasant time.
ii. an unpleasant experience.
Answer:
For the child in the poem the past was a pleasant time.

Complex Factual Questions:

Question 1.
What is the theme of the poem?
Answer:
The theme of the poem is about time and the child’s definition about the different periods of time.

Question 2.
How is this poem presented?
Answer:
This poem is presented as a dialogue between the poetess and a happy child.

Question 3.
What is the one characteristic of the past? Which is emphasised in the poem?
Answer:
One characteristic of the past which is emphasised in the poem is that we can never go back to it.

Question 4.
How should we make use of the present time?
Answer:
We should make use of the present time by using it to gather strength and courage to face the future.

Poetic Device:

Rewrite the Metaphors as Similes:

Question 1.
The past is an autumn evening soft and mild.
Answer:
The past is like an autumn evening soft and mild.

Question 2.
The present is a green and flowery spray.
Answer:
The present is like a green and flowery spray.

Question 3.
The future is a sea beneath a cloudless sun.
Answer:
The future is like a sea beneath a cloudless sun.

Question 4.
Give the rhyme scheme of the first stanza.
Answer:
The rhyme scheme of the first stanza is (a b a c).

Question 5.i.
Name and explain the figures of speech.
With a wind that sighs mournfully
Answer:
Personification – Wind is given human qualities,

Question ii.
What the past is like to thee?
‘An Autumn evening soft and mild.
Answer:
Simile – Direct comparison of past with an autumn evening.

Formative Assessment

Question 1.
Complete the following stanza to compose a poem on the topic:
The time gone by…….

Past, Present, Future Introduction:

Past, Present, Future written by Emily Bronte is a dialogue between the poetess and a happy child. They discuss what each period of time means to the child, a child with the ability to see beauty and optimism around it.

Past, Present, Future Summary in English

The poetess Emily Bronte begins the poem by asking a happy child what the past is like to him/ her. In response the child compares the past as an autumn evening which is soft and mild with a sad wind sighing in the background.

In response to the query about the present hour the child compares it to the pleasant green and flowery branch wherein a young bird gathers courage and power to mount and fly above the blue sky. In other words the child finds the present filled with hope, courage and aspiration to scale great heights; the time to gather strength.

On being asked about the future the child compares it with a sea under a cloudless sun, a sea which is mighty, glorious, dazzling and never ending. Through these words the child implies about the thrilling and never ending possibilities which awaits for him/her.

Glossary:

1. autumn (n) – the season which follows summer when leaves fall from the trees
2. mild (adj) – not severe or not very harsh
3. mournfully (adv) – with sad feelings
4. spray (n) – a flowering branch
5. mount (n) – to ascend, get ready for take off
6. glorious (adj) – marvellous
7. dazzling (adj) – extremely bright
8. stretching (v) – to be made longer
9. infinity (n) – endlessness
10. sighs (v) – to let out a long breath slowly to express sadness
11. thee (pro) – you
12. mighty (adj) – possessing great power or strength; very powerful
13. beneath (prep) – under

Balbharti Maharashtra State Board Class 7 English Solutions Chapter 4.4 Home Sweet Home Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 7 English Solutions Chapter 4.4 Home Sweet Home

Class 7 English Chapter 4.4 Home Sweet Home Textbook Questions and Answers

1. Write in your own words.

Question a.
How does the poet glorify his home in the first stanza?
Answer:
The poet glorifies his home in the first stanza by saying that we may roam places and stay in palaces but like magic we will get drawn to our home however modest it may be because there
is no place in the world better than our own home.

Question b.
How does the poet describe his home in the second stanza?
Answer:
The poet in the second stanza there is says that all the wonders in the world nothing as compared to his modest home. It is in his humble dwelling that he gets peace of mind which is more precious than anything in the world.

Question c.
What makes the poet remember his mother?
Answer:
The poet spends long periods of time away from home and while gazing at the moon in a faraway place he remembers his mother who must be looking at the moon from their home and remembering her child.

Question d.
What does the poet miss?
Answer:
The poet misses his loving father’s smile and the soothing caress of his loving mother.

Question e.
What does the poet hope for?
Answer:
The poet hopes to return to the warmth and comfort of his humble home and remain there forever.

Question f.
In which professions is a person forced to stay away from his home/homeland for a long time? Try to guess why the poet is forced to stay away from his home.
Answer:
A person is forced to stay away from his home/ homeland for a long time if he is an artist – could be an actor, a writer, a model, a businessman, an interpreter, a trader, a dancer, a singer, etc. A poet needs to be constantly on the move so that he gets inspired to write and create poetry. I think this is the reason the poet is forced to stay away from home.

2. Write out a few things that you would really miss about your home if you were to stay away from it for long.

Question a.
Write out a few things that you would really miss about your home if you were to stay away from it for long.
Answer:

1. I would miss my family members in the first place.
2. I would miss my friends.
3. I would miss the food made at home by my mother.
4. I would miss the love and care I get from my parents and relatives.
5. I would miss the smell of my home, my bed.

Class 7 English Chapter 4.4 Home Sweet Home Additional Important Questions and Answers

Simple Factual Questions.

Question 1.
State Whether the statements are True or False
1. Though we may roam around palaces, but there is no place like home.
2. The birds sings dolefully and does not respond to the poet’s call
Answer:
1. True
2. False

Poetic Devices.

Question 1.
Pick out the rhyming words from the extract.
Answer:
roam-home, there-elsewhere, rain-again, call-all.

Question 2.
Mid pleasures and palaces though we may roam.
Answer:
Alliteration – The sound of ‘p’ is repeated for better poetic effect.

Question 3.
To thee I’ll return, overburdened with care. (Explain the line)
Answer:
The poet says that he’ll return home with a lot of worries.

Question 4.
Pick out the rhyming words from the extract.
Answer:

1. smile – beguile
2. roam – home
3. care – there

Question 5.
Write the rhyme scheme for the first four lines of the extract.
Answer:
The rhyme scheme is aabb.

Name the figures of speech for the following.

Question 1.
How sweet ’tis to sit ‘neath a fond Father’s smile.
Answer:
Alliteration – The sound of’ s’ and’ f’ is repeated for better poetic effect.

Question 2.
But give me, oh, give me, the pleasures of home.
Answer:
Repetition – The words ‘give me’ have been repeated for better poetic effect.

Question 3.
No more from that cottage again will I roam.
Answer:
Inversion – The words are not in order for better poetic effect. The right order is, ‘No more will I roam again from that cottage’.

Question 4.
Be a poet. Try and write a poem on ‘My Home’.
Answer:
My Home

I have a cosy little home,
Made of cement, bricks and dome.
It is coloured beautifully,
With everything arranged wonderfully.
We are a family of five,
When together we come alive.
A place where I can rest.
My home, it is the best.

Home Sweet Home Summary in English

The poet John Howard Payne through his poem conveys the message that ‘Home Sweet Home’ assurs us that there is no place better than home. It is a poem that reaches into the heart. He says that home is a place where we experience independence, safety, privacy and where we can dispense hospitality. The poet says that wherever we might roam or live, there is no comfort like home however big or small it is, because a home is where our family is.

Introduction:

The poem ‘Home Sweet Home’ was written by John Howard Payne, an American actor, poet, playright and author. ‘Home Sweet Home’ is a song adapted from Payne’s opera ‘Clari, the Maid of Milan’.

Glossary:

1. humble (adj) (here) – modest
2. charm (n) – an object believed to have magic powers
3. ‘neath (adj) – below or underneath
4. hallow (v) – to make holy
5. exile (n) – banished from one’s home or country
6. splendour (n)- magnificent
7. vain (adj) – useless
8. gayly (adv) – cheerfully, happily
9. dearer (adj) – precious or greatly valued by someone
10. gaze (v) – to stare intently
11. tread (v) – to walk
12. drear (adj) – cheerless
13. woodbine (n) – any of several climbing vines
14. fragrance (n) – pleasant smell
15. soothe (v) – comfort
16. beguile (v) – to charm, delight or captivate
17. overburdened (adj) – excessively burdened
18. care (n) (here) – worries
19. solace (n) – comfort in a time of loneliness or distress

Balbharti Maharashtra State Board Class 7 English Solutions Chapter 1.6 A Collage Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 7 English Solutions Chapter 1.6 A Collage

Class 7 English Chapter 1.6 A Collage Textbook Questions and Answers

Answer the following questions.

Question 1.
What did Swami Vivekanand make the world aware of?
Answer:
Swami Vivekanand made the world aware of the greatness of Indian Philosophy.

Question 2.
Why did Swami Vivekanand receive a standing ovation at the Parliament of World’s religions?
Answer:
At the Parliament of World’s religions, Swami Vivekanand began his speech with “Sisters and brothers of America!”. For these words, he received a standing ovation.

Question 3.
What did Swami Vivekanand emphasize upon?
Answer:
Swami Vivekanand emphasized the importance of selflessness and service to mankind.

Question 4.
What is Swami Vivekanand regarded as?
Answer:
Swami Vivekanand is regarded as a patriotic saint.

Question 5.
What is a collage?
Answer:
A collage is a collection of various materials such as pictures, articles and quotes, put together in an artistic and creative manner.

Question 6.
What does the collage given in the textbook talk about?
Answer:
The collage talks about Swami Vivekananda and displays a few famous quotes by him.

Question 7.
What can you include in a collage?
Answer:
Photographs, pictures, famous quotes/lines and information about a particular person can be included in a collage.

Question 8.
A mosaic is similar to a collage. Can you say how?
Answer:
A mosaic is a design that is formed by putting pieces of colourful glass, stones or tiles together in a creative manner/pattern, which sounds similar to a collage i.e. a collection of various pictures and quotes, put together in an artistic way.

Question 9.
Where can you see the collage pattern being used?
Answer:
The collage pattern can be seen in paintings, architectural work and photography.

Explain the quotes.

Question 1.
Arise! Awake! And stop not until the goal is reached.
Answer:
The given quote says that one should rise up to achieve one’s goal and until it is achieved, one should not stop to rest. Achieving one’s goal should be a relentless affair.

Question 2.
Talk to yourself atleast once in a day… otherwise you may miss a meeting with an excellent person in the world.
Answer:
The given quote says that each one of us is unique and excellent in our own way. We spend most of our lives talking to others but forget to have a conversation with ourselves and hence do not realize our own qualities.

Question 3.
Fill the brain with high thoughts, highest ideals. Place them day and night before you and out of that will come great work.
Answer:
High thoughts and high ideals act as an inspiration to achieve higher goals. Reading the life and work of great men motivates us to believe in ourselves. The outcome of which is great work.

Question 4.
Take up one idea. Make that one idea your life – think of it, live on that idea. Let the brain, muscles, nerves every part of your body, be full of that idea, and just leave every other idea alone. This is way of success.
Answer:
Swami Vivekanand through these lines tells us to eat, sleep and breathe our dreams. We must focus on that one dream so much that it becomes our very life. Only when we completely focus our energy on that one dream and give our heart and soul to it, can we be successful.

Question 5.
Whatever you think, that you will be. If you think yourself weak, weak you will be. If you think yourself strong, strong you will be.
Answer:
The given lines emphasize the importance of thoughts. The quality of our thoughts determine the quality of our lives because we are what our thoughts are. So by carefully choosing empowering thoughts, we can become what we wish to become.

A Collage Summary in English

The lesson, presented in the form of a collage, talks about Swami Vivekanand, his beliefs, his work and his contribution. The lesson also has some of his famous quotes, each of which has a deep meaning to it.

Introduction:

A collage is a piece of art made by sticking various different materials such as photographs and pieces of paper or fabric on to a background.

Glossary:

1. philosophy (n) – a theory or attitude that acts as a guiding principle for behaviour
2. emphasize (v) – give special importance to something
3. patriotic (adj) – having or expressingdevotion to one’s country
4. inspirational (adj) – something that encourages and inspires
5. ideal (n) – a principle
6. standing ovation (n) – display of appreciation by standing up and clapping continuously
7. collage (n) – a piece of art made by sticking various different materials such as photographs or pieces of paper or fabric ontoa larger and firmer surface.

Balbharti Maharashtra State Board Class 7 English Solutions Chapter 1.5 Seeing Eyes Helping Hands Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 7 English Solutions Chapter 1.5 Seeing Eyes Helping Hands

Class 7 English Chapter 1.5 Seeing Eyes Helping Hands Textbook Questions and Answers

1. This passage contains four different types of invitations. They are:
A: A formal invitation
C: An oral invitation
B: A notice
D: Another oral invitation
Read each invitation carefully, keeping in mind the list of eight questions given below. Note the answers in your notebook. Verify that the formal invitation ‘A’ covers all the eight points.

1. Who is sending/giving the information?
2. What is the programme?
3. What is the name of the project?
4. Who will inaugurate it?
5. Who will preside over the function?
6. What time will the function start?
7. Where will it take place?
8. How many names get mentioned in the invitation?

Now see which of these eight points are covered in the other invitations ‘B’, ‘C’ and ‘D’. Put tickmarks against the points that are covered.

2. Prepare a formal invitation for a function you have arranged at home.
It should clearly state the following points:

• Who is inviting people to the function.
• What the programme is.
• The date and time.
• The venue. (The place where
• A polite request to attend the function. the function will take place.

Question 1.
Prepare a formal invitation for a function you have arranged at home.
Answer:

3. Write an imaginary telephone conversation in which you invite your friend to the above function.

Question 1.
Write an imaginary telephone conversation in which you invite your friend to the above function.
Answer:

• • Mohan: Hello! Could I speak to Shashank.
  • Shashank: Yes, speaking.
  • Mohan: Hi! I have called you up to invite you to the house-warming ceremony of our new home.
  • Shashank: Oh, thanks. Where have you shifted your residence?
  • Mohan: Very close to you. We are now at Shri Laxmi Niwas.
  • Shashank: Next to Blue Dales School?
  • Mohan: Yes, you got it right. Please do come with your parents.
  • Shashank: My parents are out, in Pune for about a week. When is the function?
  • Mohan: On the 25th of this month. It is a Sunday.
  • Shashank: Yes, they will be back by then. When should we come?
  • Mohan: The pooja will begin at 11.00 am.
  • Shashank: I will surely be there.
  • Mohan: Thanks. See you then.
  • Shashank: You’re welcome. See you, bye.

4. Imagine someone has invited your family to a programme and you were the only person at home when the invitation was given orally. Write a note (4-5 lines) to pass on the message to the other people in your family. Or, Write an imaginary conversation in which you pass on the message to your parents.

Question 1.
Imagine someone has invited your family to a programme and you were the only person at home when the invitation was given orally. Write a note (4-5 lines) to pass on the message to the other people in your family. Or, Write an imaginary conversation in which you pass on the message to your parents.
Answer:
Dear Mom and Dad,
Sudhir uncle has invited us for a surprise birthday party given for Anita aunty, tomorrow, 8th November at Grand Central Hotel at 7.00 pm.

Mona.

Class 7 English Chapter 1.5 Seeing Eyes Helping Hands Additional Important Questions and Answers

Answer the following questions:

Question 1.
Find different ways in which you can send an invitation using the internet.
Answer:
Through the internet an invitation can be sent via email, WhatsApp, Facebook, Twitter and other such social networking sites.

Question 2.
Many times the school authorities have to communicate with your parents. How is it done in school? How are written communications sent?
Answer:
In my school, written communications are sent through notices, SMS, Telephone, invitation cards, web pages, newsletters, quarterly report card comments and via school staff such as the peon or an attendant.

Question 3.
When do we write formal invitations and why?
Answer:
The write formal invitations for a formal event to invite the people with whom we want to celebrate and also the people we are close to. The best way to invite people to such planned events is by sending them a formal invitation. Another important reason behind writing an invitation is that it gives our invitees proper information regarding the programme, its time, date and venue.

Question 4.
What are some ways in which you can send invitations to your family and friends, apart from using the internet?
Answer:
Some other ways in which we can send invitation to our family and friends are as follows:

1. By using Indian Postal Service.
2. Using SMS or mobile phone.
3. Hand delivering.
4. Through telephone call and
5. Through courier.

Reading Skills, Vocabulary and Grammar

Read the following passage and do the activities.

Simple Factual Questions:

Principal	Teacher in-charge	Presiding dignitary	School
Suhasini Ambekar	V. S. Ajinkya	Dr. A. M. Dr. A. M. Chaudhary, Dean	New Vision High School

Complex Factual Questions:

Question 1.
Who prepared the formal invitation?
Answer:
The Principal prepared the formal invitation.

Question 2.
Where is the venue of inauguration?
Answer:
The venue of the inauguration is the Assembly Hall of New Vision High School, Off Main street, Girgaon.

Question 3.
Who are the student secretaries?
Answer:
The student secretaries are Komal Shelar and Nitin Valke.

Vocabulary:

Question 1.
Make verb forms.
Answer:

• invitation – invite
• vision – envision

Question 2.
Give homophones of the following words from the passage.
Answer:

• maid – made
• knew – new

Grammar:

Question 1.
The art teacher and her students made copies of it. (Add a question tag)
Answer:
The art teacher and her students made copies of it, didn’t they?

Question 2.
We solicit your presence at the inauguration of the project. (Write in question form)
Answer:
Don’t we solicit your presence at the inauguration of the project?

Personal Response:

Question 1.
What according to you is a formal invitation?
Answer:
A formal invitation is a letter or a card in which the important person is courteously requested to attend an important event.

Read the following passage and do the activities.

Simple Factual Questions:

Question 1.
State whether the statements are true or false.
1. The News Editor will not be sent an official invitation.
2. The News Editor refused to come for the function.
Answer:
1. False
2. False

Complex Factual Questions:

Question 1.
What is the purpose of the project?
Answer:
The purpose of the project is to make students aware of their social responsibilities.

Question 2.
Why was Mr. Shashank invited?
Answer:
Mr. Shashank, Newspaper Editor, was invited to cover the function prominently.

Vocabulary:

Question 1.
Make a sentence using the phrase/idiom ‘to set a trend’.
Answer:
Their school is setting new trends in Activity based learning.

Question 2.
Pick out words that mean.
1. Notice or attention given to someone or something by the media.
2. To a large extent.
Answer:
1. publicity
2. prominently

Grammar:

Question 1.
I have made a note of it. (Change the voice)
Answer:
A note of it has been made by me.

Question 2.
The project is an important one. (Make exclamatory)
Answer:
What an important one the project is!

Personal Response:

Question 1.
Do you think it is a good idea to invite a Newspaper Editor to such programmes? Why?
Answer:
Yes, it is a good idea to cover such programmes done for a noble cause in the newspaper, as it sets a trend for other schools to follow and children also become aware of their social responsibilities.

Language Study:

Do as directed.

Question 1.
“Mummy, you and Daddy are invited to our school on Sunday, the ninth” said Sameer.
(Write in indirect speech)
Answer:
Sameer informed his mother and father that both she and daddy were invited to his school on Sunday, the ninth.

Question 2.
We are all going to visit places. (Rewrite in past perfect tense)
Answer:
We had all gone to visit places.

Question 3.
I see. (Add a question tag)
Answer:
I see, don’t I?

Question 4.
Daddy and I can’t both go. (Remove negative)
Answer:
Either Daddy or I can go.

Question 5.
Teachers made phone calls to some special invitees. (Frame a wh- question to get the underlined part as an answer)
Answer:
Who made phone calls to some special invitees?

Question 6.
Write the noun forms of.

1. inaugurate
2. converse
3. participate

Answer:

1. inauguration
2. conversation
3. participation

Question 7.
Write noun for the following ending in ’-er’ or ’-or’ to show the work or function or description of the person:

1. help
2. edit
3. visit
4. speak
5. teach
6. preach

Answer:

1. helper
2. editor
3. visitor
4. speaker
5. teacher
6. preacher

Writing Skills:

With your teacher’s help, get two or three specimens of the notices/announcements put up on the school notice board.

Question 1.
Specimen 1
Answer:

Question 2.
Specimen 2
Answer:
Announcement:
This is to inform the students of Std. VIII that the Nature Club has organized a one day nature trail to CEC at BNHS, Goregaon on 26th July, 2017. The timing for the same is 7.00 am to 5.00 pm. Students interested in going for the trail should register their names with the Nature Club advisor, Mrs. Ketki Dhuri by paying Rs. 500/-(Inclusive of transport and entry fees).

– By Order

Seeing Eyes Helping Hands Summary in English

The lesson discusses various means of sending an invitation for an inaugural function in New Vision High School. Formal invitation, oral invitation and notice being some of them. With the help of a sample invitation the lesson conveys that one can choose among various means of communication, the one that best suits one’s need.

Introduction:

Communication is a vital tool. In today’s times, with the rise in technological media, communication has undergone a drastic change. From letters to emails; invitations and messages can be sent in a short time.

Glossary:

1. inauguration (n) – the beginning or introduction of something ‘
2. scheduled (v) – to arrange that an event or activity will happen at a particular time
3. formal (adj) – done in accordance with convention or etiquette
4. sample (n) – a specimen
5. conversation (n) – a talk, especially an informal one
6. to set a trend – to do something that becomes accepted or fashionable, something that a lot of other people copy
7. accompany (v)-to go along with someone
8. specimens (n) – examples of something; samples
9. solicit (v) – to formally ask for help
10. preside (v) – to be in charge of a formal meeting or ceremony
11. invitee (n) – person who is invited
12. sec. – short form for second
13. trend (n) – a general direction in which something is developing or changing
14. prominently (adv) – in a way that many people will know about it

Balbharti Maharashtra State Board Class 7 English Solutions Chapter 2.6 Chasing the Sea Monster Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 7 English Solutions Chapter 2.6 Chasing the Sea Monster

Class 7 English Chapter 2.6 Chasing the Sea Monster Textbook Questions and Answers

1. From the passage, find all the words and phrases used to describe the ‘monster’.

Question 1.
From the passage, find all the words and phrases used to describe the ‘monster’.
Answer:
Unearthly animal, fearsome creature, unknown creature, huge glowworm, infernal beast, motionless animal.

2. Form groups of 4. Find all the references to time given In the passage. Then make a chart to show the events described in the passage along with the time when they occur.
Example:

• All night long: The crew stayed on their feet
• Near midnight: …………………………………….
• At 12.53: …………………………………………….
• ………….. : …………………………………………….
• ………….. : …………………………………………….
• ………….. : …………………………………………….
  (lise as many lines as you need.)

Question 1.
Form groups of 4. Find all the references to time given in the passage. Then make a chart to show the events described in the passage along with the time when they occur. Example:
Answer:

• All night long: The crew stayed on their feet.
• Near midnight: The sea animal disappeared.
• At 12.53: A deafening hiss was heard.
• Near 2.00 am: The core of a light appeared.
• At 6.00 am: The animals electric glow disappeared.
• At 7.00 am: A dense morning mist spread.
• At 8.00 am: The mist disappeared, the sea animal was seen.
• A few moments later: The frigate headed for the animal.
• Three-quarters of an hour later: They were not getting closer to the animal.
• Next one hour: The frigate gathered speed and so did the sea animal.
• At 10.50 pm: The electric light reappeared.

3. How long does the whole event described in this passage take? Work it out by reading the passage.

Question 1.
How long does the whole event described in this passage take? Work it out by reading the passage.

4. Observe the picture and the labels carefully. Then match the words and the meanings given in the foliwing table.

Question 1.
Observe the picture and the labels carefully. Then match the words and the meanings given in the foliwing table.

Answer:

Words	Column ‘B’
1. Yard	(e) A pole slung across a ship’s mast. A sail hangs from a yard
2. Mast	(d) Tall, upright pole on a ship
3. Bow	(b) The forward part of the main body of a ship
4. Deck	(a) A floor, flat area built on a Ship
5. Forecastle	(g) The part which is always at the front while the ship is sailing
6. Starboard	(h) The right-hand side of a ship as one faces forward
7. Stern	(f) The rearmost (back) part of a ship
8. Afterdeck	(i) An open deck near the back
9. Fore	(c) The forward part of a deck

5. Form groups of 4-5. Read the following sentences aloud. Using your imagination and with the help of group discussion, write other situations in which the sentences can be used.

• The outcome: disappointment and anger.
• The hour of battle had sounded
• What a chase!
• This was our chance, ……..

Question 1.
Form groups of 4-5. Read the following sentences aloud. Using your imagination and with the help of group discussion, write other situations in which the sentences can be used.
Answer:

• The outcome: disappointment and anger
• The hour of battle had sounded
• What a chase!
• This was our chance
• The outcome: happiness and relief
• The outcome: fun and joy
• The outcome: misery and poverty
• The hour of decision had arrived
• The sound of victory was heard
• What a book!
• What a personality!
• What a movie!
• This was our victory …
• This was our last straw …
• This was our fight…

6. Find the different units of measurement mentioned in the passage and get more information about them from the internet.

Question 1.
Find the different units of measurement mentioned in the passage and get more information about them from the internet.

7. Language Study: Transitive and intransitive verbs : We can classify verbs into two types – transitive and intransitive. Some verbs need on object/objects. When a verb has an object, it is a transitive verb. For example, ‘The boy kicked the football’. Here the verb ‘kick’ has ‘the football’ as its object. ‘Give’, ‘cook’, ‘buy’ are transitive verb.
Some verbs do not need any objects. When a verb does not have an object, it is an intransitive verb. For example, ‘We laughed loudly’. The verb ‘laugh’ in this sentence does not have an object. ‘Laugh’, ‘walk’, ‘dy’ are intransitive verbs.
Some verbs can be transitive or intransitive. For example,
‘Birds fly’. (intransitive) ‘Children fly kites’. (transitive)

Class 7 English Chapter 2.6 Chasing the Sea Monster Additional Important Questions and Answers

Answer the following questions.

Question 1.
Guess what order the commander must have given.
Answer:
The order given by the commander must have been to advance slowly towards the monster and to be ready to attack.

Question 2.
Why did the Abraham Lincoln slow down? Answer: The Abraham Lincoln slowed down because
it was
unable to compete with the monster’s speed.

Question 3.
What is the monster compared to when it disappeared?
Answer:
The monster is compared to a huge glow-worm when it disappeared.

Question 4.
What did the deafening hiss resemble?
Answer:
The deafening hiss resembled the sound made by a water spout expelled with tremendous intensity.

Question 5.
Who would get $ 500?
Answer:
The man who would pierce the infernal beast would get $ 500.

Question 6.
Describe the gunner who accepted the challenge.
Answer:
The gunner who accepted the challenge was a calm, cool, old and gray bearded man.

Question 7.
What was Ned Land doing?
Answer:
Ned Land was brandishing his dreadful weapon.

Reading Skills, Vocabulary and Grammar

Simple Factual Questions:

Fill in the blanks.

Question i.
Let’s wait for daylight and then we’ll play a …………… role.
Answer:
different

Question ii.
Unable to compete with the monster’s speed, our frigate, the ………………. slowed down.
Answer:
Abraham Lincoln

Complex Factual Questions:

Question 1.
What is the name of the narrator?
Answer:
The name of the narrator is Professor Aronnax.

Question 2.
What is the name of the ship?
Answer:
The name of the ship is ‘Abraham Lincoln’.

Question 3.
At what time is this event taking place?
Answer:
This event is taking place sometime near midnight.

Vocabulary:

Question 1.
Give two words as phrases used to describe ‘monster’ in this passage.
Answer:
fear some creature, cetacean

Grammar:

Question 1.
The animal mimicked the frigate. (End with ’… the animal’)
Answer:
The frigate was mimicked by the animal.

Question 2.
No one thought of sleeping. (Make it affirmative)
Answer:
Everyone remained awake.

Question 3.
The animal mimicked the frigate. (Change into interrogative)
Answer:
Didn’t the animal mimic the frigate?

Question 4.
Pick out the verb and state whether it is transitive or intransitive.

1. Rama rang the bell loudly.
2. The bell rang loudly.
3. The baby sleeps on a bed.
4. The birds fly in the air.
5. Close the door.
6. He wrote a letter to his friend.

Answer:

1. rang – transitive verb
2. rang – intransitive verb
3. sleeps – intransitive verb
4. fly – intransitive verb
5. dose – transitive verb
6. wrote – transitive verb

Read the following passage and do the activities.

Simple Factual Questions:

Write whether True or False.

Question i.
We stayed on the alert until night and were getting ready for action.
Answer:
False

Question ii.
The mist was very dense.
Answer:
True.

Complex Factual Questions:

Question 1.
What can the blunderbusses do?
Answer:
The blunderbusses can launch harpoons as far as a mile.

Grammar:

Question 1.
Ned had a dreadful weapon. (Add a question tag)
Answer:
Ned had a dreadful weapon, didn’t he?

Question 2.
Pick out two abstract nouns from the extract.
Answer:
Disappointment, anger.

Personal Response:

Question 1.
Do you like travelling on sea? Why?
Answer:
No, I do not like travelling on sea. I don’t know how to swim and I am very scared of drowning.

Read the following passage and do the activities.

Fill in the blanks.

Question i.
………… stayed at his post, harpoon in hand.
Answer:
Ned Land

Question ii.
The animal is faster than the ………….. .
Answer:
Abraham Lincoln

Complex Factual Questions:

Question 1.
Explain why the author uses the words “what a chase!”.
Answer:
It was an exciting chase no doubt. The author says that the excitement shook his very being. The animal was so smart, it let the frigate get a little closer to it and then picked up speed and kept its distance. The animal was playing tricks with the frigate.

Vocabulary:

Question 1.
Pick out the words from the extract that mean the following.
i. person who fires the cannon
ii. moved faster
Answer:
i. cannoneer
ii. gathered speed

Question 2.
Give the meanings of the following.
i. harpooner
ii. mate
Answer:
i. person who handles the harpoon
ii. assistant

Grammar:

Question 1.
what a chase no i can’t describe the excitement that shook my very being (Punctuate)
Answer:
What a chase! No, It can’t describe the excitement that shook my very being.

Question 2.
The cannoneer fired a shot. (Add a question tag)
Answer:
The cannoneer fired a shot, didn’t he?

Language Study

Do as directed.

Question 1.
There was a mighty explosion. (Pick out the verb and state its kind)
Answer:
was – transitive verb.

Question 2.
The monster seemed motionless. (Frame a ’Wh1 question so as to get the underlined words as the answer)
Answer:
Who seemed motionless?

Question 3.
Barely twenty feet separated him from the motionless animal. (Pick out the adjectives from the sentence)
Answer:
Twenty, motionless

Question 4.
The electric light suddenly went out. (Identify the part of speech of the underlined word)
Answer:
Suddenly – adverb

Question 5.
Pick out the verb and state whether it is transitive or intransitive.
Question i.
The hunter killed the wolf.
Answer:
killed – transitive verb

Question ii.
Leena saw a monster.
Answer:
saw – transitive verb

Question iii.
Rains spoilt the picnic.
Answer:
spoilt – transitive verb

Question iv.
The baby cried loudly.
Answer:
cried – intransitive verb

Question v.
The bird flew away.
Answer:
flew – intransitive verb

Writing Skills

Question 1.
Write an essay on ‘A Sea Journey’.
Answer:
A sea journey is something I had never experienced. I used to look at the majestic sea and wonder what it would be like to travel by sea. I got the chance of a life time to travel on a ship.

The ship was filled with people from different states of India. At the beginning all was wonderful, the people, the sea, the sky, the weather. I was told that the journey would take many on board. But as time passed, the journey which I felt would be a pleasant one, wasn’t all that pleasant. There was nothing to see except water, water and more water. The movement of the ship on the water gave me a nauseating/nauseous feeling.

I was praying and hoping for the journey to end. At last after about eight long hours we touched land. I was so happy to be on firm landing once again. The journey by sea was an experience I wouldn’t want to repeat. This journey by sea was my first and last one.

Chasing the Sea Monster Summary in English

The lesson ‘Chasing the Sea Monster’ is an extract from the novel ‘20,000 Leagues under the Sea’ written by Jules Verne. The story in this extract is about spotting a mysterious sea monster by the inmates on a warship. The story revolves round the relentless chase between the warship (frigate) and the sea monster.

The warship (frigate) named Abraham Lincoln captained by Commander Farragut along with Professor Pierre Aronnax, a French marine biologist and narrator of the story, a master harpoonist Ned Land and other crew members chase the sea monster and in the end Ned Land succeeds in hitting the sea monster. The collision between the frigate and the sea monster is so hideous that Commander Farragut, Professor Pierre Aronnax and Ned Land are hurled into the sea.

Introduction:

The lesson ‘Chasing The Sea Monster7 is a science fiction written by Jules Verne, a French writer. He is known as the ‘Father of Science Fiction’. This is a passage, from his novel ‘20,000 Leagues under the Sea’. He describes how people on a ship think of the submarine as an animal and try to chase and hunt it.

Glossary:

1. frigate (n) – small, speedy ship used in war
2. unearthly (adj) – strange, not like those found on earth
3. luminous (adj) – bright, full of light
4. fearsome (adj) – scary, frightening
5. crew (n) – people working on the ship
6. cetaceans (n) – marine animals like a whale
7. lurking (v) – hiding
8. whaling gear (n) – equipment used to hunt whales
9. mate (n) – assistant
10. armour (n) – protective metal covering
11. profound (adj) – deep
12. astern to port (v) – towards the hinder part or stem; backward
13. blunderbusses (n) – a short, large bored gun firing metal balls, slugs or nails
14. duck guns (n) – large shot guns used for hunting ducks in large number
15. harpoon (n) – a barbed spear attached to a rope and thrown or fired from a gun to hunt whales or large fish
16. cannoneer (n) – an artillery man who uses cannon
17. harpooner (n) – a person who uses harpoons especially to hunt whales
18. enormous (adj) – huge
19. hideous (adj) – dreadful, horrid
20. mute (adj) – dumb; not having the power of speech
21. alert (adj) – attentive
22. informed (adj) – having information, based on information.
23. target (n) – a person, object or place selected as the aim of attack
24. weariness (n)- tiredness
25. brandishing (v) – to move or swing back and forth particularly demonstrating skill
26. collision (n)- clash

Balbharti Maharashtra State Board Class 7 English Solutions Chapter 2.5 Learn Yoga from Animals Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 7 English Solutions Chapter 2.5 Learn Yoga from Animals

Class 7 English Chapter 2.5 Learn Yoga from Animals Textbook Questions and Answers

1. Complete the following diagrams.

Question A.
Benefits of yoga.

Answer:

Question B.
Precautions in Yoga Practice

Answer:

Question C.
What is yoga?

Answer:

2. Prepare charts for each one of the asanas described in the passage. Use the following points:

• Name (in English, in your mother tongue)
• Meaning in English
• General information
• Steps and pictures
• Benefits

3. List the names of body parts used in the passage.

Question 1.
List the names of body parts used in the passage.
Answer:
Body parts – navel, spine, shoulder, palm, face, elbow, wrist, chin, abdomen, chest, fingers, jaws, feet, legs, toes, eyes, mouth, head, back, tongue, lungs.
Now go through the passage and find out some more and add to the list.

4. List the adverbs/adverbial phrases used in the passage.

Question 1.
List the adverbs/adverbial phrases used in the passage.
Answer:

1. to feel physically vibrant
2. feel mentally sharp
3. completely at ease
4. breathe in deeply
5. slowly raise
6. come up slowly
7. come down slowly
8. inhale immediately
9. positioned directly below
10. smoothly arch the spine
11. adds flexibility
12. simultaneously arch your back

5. Language Study: Conjunctions: A conjunction is a word which joins words or clauses. Look at the following sentences.
1. Sahil and Rohan go to school together.
2. Sahil is drawing a picture and Rahul is playing football.
In sentence 1, the conjunction ‘and’ joins two words.
In sentence 2, the conjunction ‘and’ joins two clauses.
The following are some more examples of conjunction.

1. Do you like cricket or football?
2. Your parents will be happy if you study well.
3. She has not come to school because she is ill.
4. We played well, but we lost the match.
5. Tell him that we are going to the playground.
6. When you are at home, you should help your mother in her work.

Interjections: An interjection is a word that expresses a sudden feeling or emotion. Interjections can express joy, grief, surprise, pain, approval etc.
Look at the following examples.

1. Hurrah! We have won the game. (Joy)
2. Ouch! That hurt. (Pain)
3. Wow! What a nice picture! (Approval)

Question 1.
Underline the conjunctions in the following.
Answer:

1. Do you like cricket or football?
2. Your parents will be happy if you study well.
3. She has not come to school because she is ill.
4. We played well, but we lost the match.
5. Tell him that we are going to the playground.
6. When you are at home, you should help your mother in her work

Class 7 English Chapter 2.5 Learn Yoga from Animals Additional Important Questions and Answers

Answer the following questions.

Question 1.
Where was yoga perfected?
Answer:
Yoga was perfected in ancient India.

Question 2.
What does yoga involve?
Answer:
Yoga involves the mind, body and soul.

Question 3.
What are the benefits of yoga?
Answer:
The benefits of yoga are attaining concentration, focus and improving flexibility, balance and strength.

Question 4.
How does one feel after doing yoga?
Answer:
One feels physically vibrant and mentally sharp after doing yoga.

Question 5.
Who enjoys the Lion pose asana? Why?
Answer:
Simhasana or Lion pose is favourite with young people. Young people love this asana because it requires very little effort.

Question 6.
What pose does the Bhujangasana resemble?
Answer:
The Bhujangasana is a pose that resembles the posture of a cobra with raised head.

Question 7.
What are the benefits of Bhujangasana? .
Answer:
Bhujangasana helps us to tone the muscles of our back, strengthens our spine and also benefits the chest and shoulders.

Question 8.
When does the world celebrate International Yoga Day?
Answer:
The world celebrates International Yoga Day on June 21st every year, since the year 2015.

Question 9.
Why should Marjaryasana be a part of one’s morning yoga routine?
Answer:
Marjaryasana should be a part of one’s morning yoga routine because it gently stretches the muscles of the abdomen and the back as well as helps to get rid of any body pain.

Question 10.
How does Garudasana benefit the legs?
Answer:
Garudasana makes the leg muscles stronger and improves the flexibility of joints by loosening the joint muscles.

Question 11.
What are the advantages of practising the Ustrasana?
Answer:

1. It strengthens the back.
2. It boosts mood and energy.
3. It opens the shoulders, chest and quadriceps.
4. It helps in improving digestion.
5. It adds flexibility and strength to the body.

Question 12.
Do you exercise regularly? What form of exercise do you practice ?
Answer:
I exercise regularly as my parents have always motivated me to stay fit. I go to the local swimming pool everyday to swim in the evening. Swimming is refreshing for the mind and helps to maintain the overall fitness of one’s body.

Reading Skills, Vocabulary and Grammar

Read the following passage and do the activities.

Question 1.
Complete the web diagram.

Question 2.
Fill in the blanks.
i. Yoga is a form of…….
ii. Yoga helps us to feel physically vibrant and mentally ……..
Answer:
i. biomimicry
ii. sharp

Question 3.
Match the columns.

Column ‘A’	Column ‘B’
1. Phvsicallv	a. area
2. Ancient Indian	b. sharp
3. Contemporary	c. discipline
4. Mentally	d. vibrant

Answer:

Column ‘A’	Column ‘B’
1. Phvsicallv	d. vibrant
2. Ancient Indian	c. discipline
3. Contemporary	a. area
4. Mentally	b. sharp

Answer in just one word:

Question 1.
What solves human problems with solutions already present in the natural world?
Answer:
Biomimicry.

Complex Factual Questions:

Question 1.
What is biomimicry?
Answer:
Biomimicry is the science of solving human problems with solutions already present in the natural world.

Question 2.
In what way is yoga a form of biomimicry?
Answer:
Yoga is a form of biomimicry because they comprise typical asanas and poses wherein we emulate mountains, trees, fish, cats and many more animals.

Question 3.
Which problems in our day-to-day life can be solved through biomimicry?
Answer:
Problems such as stiffness and back pain can be easily solved through biomimicry.

Question 4.
What does biomimicry mean in simple terms?
Answer:
In simple terms, ‘bio’ means ‘life’ and ‘mimicry’ means ’emulate’.

Vocabulary:

Question 1.
Give forms of the following words.
Answer:

Noun	Verb	Adjective
Nature	Naturalise	Natural
Simplicity	Simplify	Simple
Sharpness	Sharpen	Sharp

Question 2.
Pick out a word from the extract which means ‘in the same time period’.
Answer:
Contemporary.

Grammar:

Question 1.
Experts today are doing a wonderful job. (Begin with ’A wonderful job’)
Answer:
A wonderful job is being done by the experts today.

Question 2.
This helps us to solve our problems. (Add a question tag)
Answer:
This helps us to solve our problems, doesn’t it?

Personal Response:

Question 1.
Do you think it is necessary to exercise? Why?
Answer:
Yes. I do think it is necessary to exercise. Exercising keeps us fit and healthy. We feel active and fresh to meet the challenges of the day. It also keeps us mentally positive.

Language Study

Do as directed.

Question 1.
The best time to practise is in the morning. (Begin with ‘The morning’)
Answer:
The morning is the best time to practise.

Question 2.
Practise in a clean, airy, well-lit room. (Pick out the adjectives in the sentence)
Answer:
Clean, airy, well-lit.

Question 3.
Relax your muscles completely. (Identify the kind of sentence)
Answer:
Imperative sentence.

Question 4.
Kneel on the yoga mat and place your hands on the hips. (Pick out the nouns)
Answer:
Mat, hands, hips.

Fill in with conjunctions.

Question 1.
This is the picture ……….. I painted yesterday.
Answer:
that

Question 2.
We met the sailors ……….. ship was wrecked.
Answer:
whose

Question 3.
This is the girl ………… has a melodious voice.
Answer:
who

Question 4.
………….. you study hard, you will succeed.
Answer:
If

Question 5.
………… it rains heavily, life comes to a standstill.
Answer:
When.

Question 6.
Give examples of interjections.
Answer:

1. Oops! I broke it. (mistake)
2. Hushi/Shh! The baby is sleeping, (silence)
3. Hey! What are you doing here? (surprise)
4. Oh! You wanted tea and not coffee, (realisation)
5. Ugh! What a foul smell! (disgust)
6. Phew! We nearly missed the fall! (relief)
7. Whew! I cannot believe we have completed on time, (relief/amazement)

Fill in with interjections.

Question 1.
………… ! You stamped my foot.
Answer:
Ouch

Question 2.
………… ! If only I had listened.
Answer:
Oh

Question 3.
………… ! It looks horrible.
Answer:
Ugh

Question 4.
………… ! I spilled the milk.
Answer:
Oops

Question 5.
………… ! What a pretty dress!
Answer:
Wow

Learn Yoga from Animals Summary in English

The lesson aptly shows us how we can do yoga by imitating animals and reptiles. It tells us the benefits and ways one can remain fit and healthy.

Introduction:

Yoga is a physical, mental and spiritual practice attributed mostly to India. Yoga day is celebrated annually on 21st June since 2015. The United Nations General Assembly has declared this day, 21st June to be an international day for yoga. The Indian Prime Minister, Narendra Modi, in his U.N. address suggested the date of 21st June as it is the longest day of the year in the Northern Hemisphere.

Glossary:

1. emulate (v) – imitate
2. vibrant (adj) – full of energy and life
3. posture (n) – the position in which you hold your body while sitting or standing
4. tone (v) – here it means to make the muscles firm
5. navel (n) – belly button
6. assume (v) – here it means ‘take’
7. splayed (v) – spread apart
8. quadriceps (n) – the large muscle at the front of the thigh
9. composite (adj) – mixture of
10. integrated (adj) – composed and co-ordinated
11. contemporary (adj) – same time period
12. discipline (n) – a specific branch of knowledge or learning
13. jerk (n) – sudden uncontrolled movement
14. vertebra (n) – small bones which make up the backbone
15. palette (n) – roof of your mouth
16. exhaling (v) – to expel air
17. inhale (v) – to draw in air
18. routine (n) – a course of action
19. flexibility (n) – quality of being flexible, suppleness
20. calf (n) – the muscle in the back of the leg below the knee
21. aches (n) – continuous dull pains in a part of one’s body
22. arch (n) – a curve with the ends down and the middle up
23. drawing (v) – to direct one’s attention to something
24. explosion (n) – a sudden burst
25. biomimicry – the science of solving human problems with solutions already present in the natural world.

Balbharti Maharashtra State Board Class 7 Science Solutions Chapter 16 Natural Resources Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 7 Science Solutions Chapter 16 Natural Resources

Class 7 Science Chapter 16 Natural Resources Textbook Questions and Answers

1. Describe natural resources with reference to the following 3 types:

Question a.
Mineral resources
Answer:
Mineral wealth has an important place among natural resources. The rocks on the earth are mainly made of minerals. These minerals can be obtained by mining. Minerals that contain a high proportion of metals are ores, (i) Minerals are formed from the magma in the earth’s crust and the lava from the eruption of volcanoes when they cool and get transformed into crystals e.g. magnetite, mica, (ii) Minerals get transformed from one form into another due to large changes in temperature and pressure e.g. Diamond, Graphite, (iii) There are 3 types of minerals according to their properties Non-metal minerals: e.g. mica, sulphur, potash, diamond.

• Metals minerals: e.g. Iron, gold, silver, tin, bauxite, platinum.
• Energy minerals: e.g. Coal, mineral oil, natural gas, diamond, ruby, sapphire, jade are used as gems.

Some important minerals and ores are Iron ore, manganese, bauxite, copper and mica.

Question b.
Forest resources
Answer:

1. A forest is a natural habitat of plants, animals and microbes.
2. Forest perform certain specific protective and productive functions.
3. We get different types of wood and many medicinal plants from forests.
4. Forest wealth includes fire wood, trees like teak, mahogany, neem, acacia, subabhul, fibers, paper, rubber, gum, aromatic substances.
5. We get fragrant essential oils from lemon grass, vanilla, kewada, vetiver (khus) and eucalyptus.
6. Sandalwood and oil of eucalyptus are used for making soaps, cosmetics and incense sticks.
7. Also we get fruits, bulbs, roots, honey, sealing wax, dyes from forest.
8. Many medicinal plants adulsa, bel, neem, periwinkle, cinnamon, are used for treatment of various diseases such as cough cold, malaria, diarrhoea, cancer, fever and cold.
9. Wood is used as a source of energy for cooking purpose and for keeping warm.
10. For making furniture, tool handles, matches, bridges, boats etc.
11. Bamboos are used for matting, flooring, basket, ropes, rafts, cots etc.
12. Bamboos, wood are used in the manufacture of rayon, yams, artificial silk-fibers.

Question c.
Ocean resources
Answer:

1. Oceans occupy about 70% of a earth’s surface.
2. Energy can be obtained on a large scale from oceans.
3. Sea waves at high and low tide and ocean currents are being used for generation of power.
4. There are billions of tons of minerals dissolved in ocean water.
5. There are large reserves of tin, chromium, potassium, phosphates, copper, zinc, iron, lead, thorium, manganese, sulphur, uranium in the ocean and sea beds.
6. Also we get many types of gems, conches, shells and pearls from the sea.
7. There are large reserves of mineral oil and natural gas at the bottom of sea.
8. We get fishes, dried shrimp, shells, fungi, shark, cod fish and sea cucumber from the ocean.

2. Write answers to the following questions in your own words.

Question a.
What is meant by fossil fuel? What are their types?
Answer:

1. Fossil fuels (such as coal or natural gas) are formed in the earth from dead plants and animals, due to high pressure from above and the heat from the earth’s interior.
2. The dead plants, animals get transformed into fossil fuel.
3. There are three types of fossil fuels which can be used for energy production, Coal, oil and natural gas.

a. Coal:

1. Coal is a solid fossil fuel formed over millions of years by the decay of land vegetation,
2. Coal is a store house of carbon. Coal is found in mines,
3. It is like porous, hard, black rock.
4. It is burnt to obtain heat energy.
5. It is used as a fuel in thermal power plants and to run boilers and railway engines, for cooking and baking bricks.
6. Anthracite is the coal of the highest grade.
7. Producer gas and water gas are obtained from coal.

b. Mineral oil:

1. Mineral oil is the liquid fuel formed by the decomposition of organic substances buried underground,
2. The underground mineral oil is extracted through oil wells.
3. Mineral oil is found mainly in oil sands, shale, sandstone and limestone at a depth of about 1000 to 3000 metres.
4. Mineral oil is also known as petroleum or crude oil. It is greenish-brown in colour.
5. Petroleum is a mixture of many compounds mainly of the hydrocarbon type.
6. It also contains compounds of oxygen, nitrogen and sulphur.
7. Petroleum is extracted through oil wells and refined by fractional distillation to separate other components,
8. Aviation petrol, gasoline, diesel, kerosene, naphtha, lubricating oil, tar are all obtained from petroleum.
9. They are used as fuel and for production of dyes, pesticides, perfumes and artificial fibres.

c. Natural gas:

1. Natural gas is an important fossil fuel.
2. It is lighter than air. It is found with petroleum in underground oil wells and in some places as natural gas alone.
3. The main component of natural gas is methane (CH₄), ethane (C₂H₆), propane (C₃H₈) and butane (C₄H₁₀) are present in small proportions.
4. This gas is highly flammable.
5. This fuel can be carried over long distance by means of a gas pipeline.
6. In absence of pipeline, it is transformed under high pressure into compressed natural gas (CNG) and liquefied natural gas (LNG).

Question b.
Make a list of the components we obtain from mineral oil.
Answer:

1. Mineral oil is the liquid fuel. It is also known as petroleum or crude oil. Petroleum is refined by fractional distillation to separate other components.
2. Aviation petrol, gasoline, diesel, kerosene, naphtha, lubricating oil, tar are the components we obtain from mineral oil.

Question c.
What do we get from forest?
Answer:

1. A forest is a natural habitat of plants, animals and microbes. We get wood, firewood from trees like teak, mahogany, neem, subabhul.
2. Also we get fibers, paper, rubber, gum and aromatic substances.
3. We get many medicinal plants like Adulsa, Bel, Neem, Periwinkle, Cinnamon, Cinchona which are used for treatment of various diseases like cough, cold, diarrhea, fever, cancer, diarrhoea, nausea, malaria.
4. We get fragrant essential oils from lemon grass, vanilla, kewada, khus, eucalyptus.
5. In addition to this we get fruits, bulbs and roots, honey, sealing wax, catechu, dyes from forest.

Question d.
What are the items included in ocean resources? What are their uses?
Answer:

1. Tons of minerals are found in ocean water.
2. They are tin, chromium, phosphates, copper, zinc, iron, lead, manganese, sulphur, uranium etc.
3. We also get many types of gems, conches, shells and pearls from the sea.
4. Mineral oil and natural gas is found at the bottom of sea.

Bio-resources in oceans

• Fishes – like pomfret, seer fish as also shrimps
• prawns – they are sources of proteins and vitamins, therefore, mainly used as sea food
• Dried shrimp, Bombay duck powder – used as poultry feed and is a good manure.
• Shells – used for preparation of medicines, ornaments and decorative articles.
• Fungi – used for the production of antibiotics.
• shark and cod fish – used for producing edible oil rich in Vitamins A, D and E.
• Sea cucumbers – used as medicine for treating cancer and tumours.

Mineral resources from oceans

• Thorium – used in the production of atomic energy.
• Magnesium – used in the flash bulb of a camera.
• Potassium – the main ingredient in production of soap, glass, fertilizer.
• Sodium – used in the production of cloth and paper.
• Sulphate – used in making artificial silk.

Question e.
Why should we prevent the wastage of fuels used for vehicles?
Answer:

1. Vehicles are powered by gasoline or diesel petrol.
2. Nowadays compressed natural gas (CNG) is also used.
3. Aviation petrol, gasoline, diesel, we get from petroleum after fractional distillation.
4. Petroleum is a non-renewable source of energy.
5. It is getting depleted day by day and the demand for fuel has increased greatly due to the rapidly growing population.
6. But the reserves of petroleum (fossil fuel) are limited.
7. It is becoming difficult to meet the increased demand. So we should prevent the wastage of fuel.

Question f.
Why is the diversity of plants and animals in the forests declining?
Answer:

1. The major causes of biodiversity decline are land use changes, pollution, changes in atmosphere, CO₂ concentration, changes in the nitrogen cycle, acid rain, climate alteration and introduction of exotic species.
2. All this is due to population growth.
3. This is the main cause of the loss of biodiversity. More of wood for fuel is been used, more land is required for food production, livestock grazing etc.
4. Rainforest land is converted to industrial and residential usage, so natural habitat of birds, animals is destroyed.
5. Due to population growth most of wild land is converted to crop land. So no space for animals to live, their natural habitat is destroyed.

Question g.
Write the names of five minerals and the useful substances obtained from them.
Answer:
Some important minerals and ores are:

1. Iron ore: It is used for making farming implements, rails of railway tracks etc.
2. Manganese: Compounds of manganese are used in the preparation of medicines and for giving a pink tinge to glass. Manganese is also used in electrical appliances.
3. Bauxite: It contains 55% Aluminium. Therefore, it is used mainly in aeroplanes, transport vehicles and to make electric wire.
4. Copper: It is used to make electric wires as well as in radios, telephones, vehicles, and for making kitchen utensils and statues.
5. Mica: Mica has many uses such as in ayurvedic medicines, dyes, electric machines and equipment, wireless communication equipment, etc.

Question h.
Name the two important stages in the process of obtaining metals from ores.
Answer:
The two important stages in the process of obtaining metals from ores are extraction and purification.

3. What steps are taken for protection and conservation of natural resources?

Question a
What steps are taken for protection and conservation of natural resources?
Answer:

1. Protection and conservation of natural resources is necessary to protect the natural world. (CNRM) Community Natural Resource Management has been promoted in recent years for biological conservation.
2. The World Conservation Union has been formed. It is the world’s leading authority and democratic platform in conservation and sustainability.
3. Young trees should not be cut. More and more trees need to be grown.
4. The stringent restrictions/ laws/ Regulations regarding use of forests should be strictly followed. Awareness is being created through Mass media.

4. Complete the Flow Chart:

Question a.

Answer:

5. How does the economic condition of a nation depend on its natural resources?

Question a.
How does the economic condition of a nation depend on its natural resources?
Answer:
1. Natural resources are a necessary condition for economic growth.
2. Three circles enclosed within one another shows how both economy and society are subsets of our planetary ecological system.

3. Natural resource economics deals with the supply, demand and allocation of the Earth’s natural resources.
4. Economic growth is an increase in the value of goods and services produced in an economy.
5. The natural resources of a country depend on the climatic and environmental conditions.
6. Countries having plenty of natural resources enjoy good growth than countries with small amount of natural resources.
7. A country having skilled and educated work force with rich natural resources takes the economy on the growth path, because skilled and educated people can efficiently utilize or exploit natural resources, e.g. Saudi Arabia: their economic growth is high, because they have oil wells.
8. All countries import fuel or oil from them so Saudi Arabia is economically a rich country.

6. Which medicinal plants will you grow on your school premises and near your house? Why?

Question a.
Which medicinal plants will you grow on your school premises and near your house? Why?
Answer:
1. I will grow tulsi, neem, lemon grass, bel, adulsa, periwinkle, cinnamon, ashwagandha, shatavari, amla, hirda, behda.
2. These plants are used for treatment of various diseases.

• Tulsi → for cough and cold.
• Amla, hirda, behda → Help in digestion of food or any stomach related problems.
• Adulsa → for cough and cold
• Bel → for Diarrhoea
• Neem → Fever and cold
• Periwinkle → Cancer
• Cinnamon → Diarrhoea, nausea.
• Cinchona → Malaria.
• Ashwagandha → It can reduce blood sugar levels. It can reduce stress and anxiety, may reduce symptom of depression.
• Shatavari → has been used for centuries in Ayurveda to support the reproductive system.
• Amla → Excellent source of vitamin C. Amla juice is best tonic to keep you younger for long.
• Hirda → This fruit is commonly called Haritaki. It is used for treating arthritis, dental problems like caries, bleeding gums.
• Behda →(Beleric) is a rejuvenative and laxative, proves beneficial for hair, throat and eyes.
• Tulsi → Tulsi has germicidal, fungicidal, anti-bacterial anti-biotic properties, cures fever. Treats diabetes, protects the heart. Tulsi has anti-oxidant component Eugenol which keeps one’s blood pressure under control.

Project:

Question 1.
Collect conches and shells of various shapes and colours and make a decorative article.

Question 2.
Collect information about the mines of various minerals.

Class 7 Science Chapter 16 Natural Resources Important Questions and Answers

Fill in the blanks:

Question 1.
………….. is the major raw material for biogas.
Answer:
cow dung

Question 2.
Atomic energy is obtained by using ores of ………….. .
Answer:
Uranium

Question 3.
Biogas generation is mainly based on the principle of ………….. .
Answer:
Fermentation

Question 4.
Floods can be prevented by ………….. .
Answer:
Afforestation

Question 5.
Coal, petroleum, natural gas are ………….. resources.
Answer:
non-renewable

Question 6.
The total percent of land of world under forest cover is ………….. .
Answer:
30%

Question 7.
A naturally occurring substance ………….. .
Answer:
minerals

Question 8.
Minerals that contain a high proportion of metal are called ………….. .
Answer:
ore

Question 9.
Coal, mineral oil and natural gas are ………….. .
Answer:
fossil fuel

Question 10.
Deposits of common salt are also found in the earth. This salt is called ………….. .
Answer:
rock salt

Question 11.
………….. is the liquid fuel formed by the decomposition of organic substances.
Answer:
Mineral oil

Question 12.
The underground mineral oil is extracted through ………….. .
Answer:
oil wells

Question 13.
Mineral oil is also known as ………….. or ………….. .
Answer:
petroleum, crude oil

Question 14.
………….. are the preserved remains of dead organisms in rock.
Answer:
Fossil

Question 15.
Coal can be formed from ………….. .
Answer:
Fossils

Question 16.
Impurities of sand and soil in ore are called ………….. .
Answer:
Gangue

Question 17.
Coal mainly contains ………….. .
Answer:
carbon

Question 18.
Petroleum is formed from ………….. .
Answer:
organisms in sea

Question 19.
Separation of various fractions of petroleum is called ………….. .
Answer:
Refining

Question 20.
We can obtain minerals from rocks by ………….. .
Answer:
mining

Question 21.
………….. is the most important ore of aluminium
Answer:
Bauxite

Question 22.
………….. is the coal of the highest grade.
Answer:
Anthracite

Question 23.
Metals are obtained from their ore by ………….. and ………….. .
Answer:
extraction, purification

Question 24.
………….. is the largest oil and gas research and production company in India.
Answer:
ONGC

Question 25.
Natural gas is transformed under high pressure into ………….. and ………….. .
Answer:
LNG and CNG

Question 26.
The main component of Natural gas is ………….. .
Answer:
Methane

Question 27.
………….. and ………….. are used for adding fragrance in soaps and incense sticks.
Answer:
Sandalwood and oil of Encalyptus

Question 28.
………….. is a natural herbal medicine for cough and cold.
Answer:
Adulsa

Answer the following:

Question 1.
What is meant by natural resources?
Answer:

1. We get many substances from nature.
2. They satisfy a variety of our daily needs. Soil, stones, minerals, air, water, plants and animals on the earth are all various kinds of natural resources.

Question 2.
What are alternative fuels?
Answer:
Hydrogen, biofuels, methanol or wood alcohol, ethanol or green alcohol are some of the alternative fuels.

Question 3.
What is meant by fuels?
Answer:

1. Fuel is a substance that is used in day-to-day life and burned to generate energy.
2. Fuels such as coal, wood, oil, gas provide energy when burned.
3. Fuels are found in solid, liquid or gaseous state.

Question 4.
Which natural resources do we use as fuels?
Answer:
We use coal, mineral oil and natural gas as fuels.

Question 5.
What is meant by forests?
Answer:
An extensive area of land covered by a variety of plants is called a forest. A forest is a natural habitat of plants, animals and microbes.

Question 6.
What are the uses of forests?
OR
Write short note on forest and its uses.
Answer:

1. A forest is a natural habitat of plants, animals and microbes.
2. Forest help improve and maintain the quality of environment.
3. Forest helps in prevention of soil-erosion, help to control floods, protects wild life, maintains the balance of atmospheric gases.
4. We get many medicinal plants from forest which help in treatment of various diseases.
5. Examples Adulsa, Bel, Neem, periwinkle, amla tulsi, cinnamon.
6. We also get wood, firewood from trees like teak, mahogani, neem, sababhul. Wood is useful for making furniture, farming implements, in construction work.
7. Forest wealth includes fibres, paper, rubber, gum and aromatic substances.
8. We get fragrant essential oils from lemon grass, vanilla, kewada and eucalyptus.
9. They are used for making soaps, cosmetics and incense sticks. We get various fruits, bulbs, roots, honey, sealing wax, catechu dyes etc. from forest.

Question 7.
Are minerals to be found in seas and on the seabed as they are found inside the earth?
Answer:
Yes, there are very large reserves of tin chromium, phosphates, copper, zinc, iron, lead, manganese, sulphur, uranium etc. in the ocean and seabed.

Question 8.
How is mineral oil formed?
Answer:

1. Mineral oil is the liquid fuel formed by the decomposition of organic substances buried underground.
2. Millions of years ago, bodies of dead sea organisms sank to the bottom of the sea.
3. Layers of soil and sand collected on them.
4. Due to high pressure and temperature the remains of the dead organisms were transformed into mineral oil.
5. The underground mineral oil is extracted through oil wells.

Use your brain power!

Question 1.
Why are all minerals not ores?
Answer:

1. Minerals that contain a high proportion of metal are called ores.
2. Majority of the metals occur in the form of compounds called ores.
3. But all minerals are not ores.
4. Few metals like gold, silver, copper, platinum and bismuth occur in free state in nature. So all minerals are not ores.

Question 2.
What is meant by metal mineral and non¬metal mineral?
Answer:

1. Metal-minerals contain metallic elements in their chemical formula. So they are called metal-minerals, for example, iron, copper, gold, silver etc.
2. They contain metal in raw form.
3. Non-metallic minerals do not contain metal elements in their inorganic chemical formula Example, Clay, Diamond, Dolomite, Gypsum, Mica, Quartz.

Question 3.
Why is mineral oil called ‘liquid gold’?
Answer:
Because of its high price and value and its economic need, the mineral oil is called liquid gold. It’s reserve is less and demand is more.

Question 4.
Why is coal called black gold?
Answer:

1. Coal is a storehouse of carbon. Coal is used as a fuel, in thermal power plants as well as to run boilers and railway engines.
2. It is used as a fuel for cooking and for baking bricks in kilns on a large scale.
3. The gaseous fuels, producer gas and water gas are obtained from coal.
4. Coal as an energy resource, contributes greatly to industrial development.
5. As coal is black in colour and worth a lot of money just like gold, it is called black gold.

Question 5.
What would happen if underground mineral resources are exhausted?
Answer:

1. Coal, petroleum and other mineral are all non-renewable sources of energy.
2. The reserve is less and demand is more. They would get exhausted one day.
3. If such a situation occurs, we will not get electricity.
4. All our household and industries depend on electricity.
5. Transportation and household items, and food items would become very costly.
6. The survival of human life will be ver\ difficult.

Question 6.
Why is natural gas an eco-friendly fuel?
Answer:

1. Natural gas is an important source of energy which is eco-friendly because of its low carbon dioxide emission.
2. When burned it produces 45% less CO₂ than coal, 30% less than oil, and about 15% less than wood.
3. It does not produce carbon monoxide, sulphur dioxide or airborne particles, all of which are harmful to human and animal health.
4. It is referred as the clean energy source and is fuel for the present century as it does not ‘ pollute the atmosphere or contribute to global warming.

Question 7.
What useful things will we have to do without if rubber is no longer available?
Answer:

1. Rubber has played a largely hidden role in global environment history for more than 150 years.
2. In industries, rubber is needed to connect and protect all moving parts of machines.
3. Native people used rubber for rubber boots.
4. Household uses rubber in everything viz dish washing gloves, toys, jar seals, tyres in vehicles.
5. Welcome mat at the door, Boots, raincoats, mattress cushions, earplugs, hot water bottles, surgical tubing and gloves, in labs, birth control device.
6. In schools rubber bands, erasers, mouse pads, key board, rolling chair wheels. Head phone pads, rubber stamps are useful items used in schools and offices.

Question 8.
What are the adverse effects of clearing of forest or cutting down trees?
Answer:

1. Clearing of forest is also called Deforestation.
2. Removal or cutting down of trees has resulted in damage to habitat, biodiversity loss and aridity.
3. If has adverse impacts on concentration of atmospheric carbon dioxide. (Trees use up carbon dioxide from the atmosphere for the process of photosynthesis.)
4. Deforestation is a main contributor to global warming. Major cause of enhanced greenhouse effect. Deforestation cause carbon dioxide to linger in the atmosphere.
5. Deforestation reduced the content of water in the soil and ground water and atmospheric moisture, because trees extract ground water through the roots and release it into the atmosphere.
6. When a part of forest is removed the trees no longer transpire this water, resulting in much drier climate.
7. Due to deforestation soil erosion and flooding, landslide problems occur.
8. Deforestation results in decline in biodiversity, on a natural global scale is known to cause the extinction of many species.
9. Forest is habitat for wild life, and many medicinal plants. If forests are removed it will affect wild life and also we will not get medicinal plants.

Find out:

Question 1.
How did the various ages of the prehistoric period get their names on the basis of the uses of metals.
Answer:
1. The three-age system in history archaeology, and physical anthropology is a methodological concept adopted during the 19th century by which artifacts and events of late prehistory and early history could be ordered into a recognizable chronology.

2. Initially developed by C. J. Thomson, director of the Royal Museum of Nordic Antiquities, Copenhagen – as a means to classify the museum’s collection according to whether the artifacts were made of stone, bronze or iron.

3. Depending-upon the use of stone, bronze, iron, that period was known as stone age, bronze age, and iron age, respectively.

Answer the following:

Question 1.
Write down the difference between Metal minerals and Non-metallic minerals.
Answer:

Metal minerals	Non-metallic minerals
1. Metal minerals contain metal in raw form.	1. Non-metallic minerals do not contain metal.
2. These metals are generally associated with igenous rocks.	2. These metals are generally associated with sedimentary rocks.
3. They are usually hard and have shine of their own.	3. They are not usually hard, have no shine of their own.
4. e.g. Iron, copper tine, bauxite.	4. e.g. Salt, coal, mica, clay.

Question 2.
Write down the different types of coal.
Answer:
Peat, lignite (brown coal), bituminous coal and anthracite are various types of coal.
Anthracite is the coal of the highest grade.

Question 3.
Write down the characteristics of Compressed Natural Gas.
Answer:
Characteristics of CNG:

1. Catches fire easily.
2. No solid waste remains after combustion.
3. Carbon dioxide and water are formed in small quantities.
4. Other pollutants are not produced.
5. Can be transported easily.
6. Combustion can be controlled easily.

Observe the pictures and answer the question.

Question a.
What is the process shown in the given picture?
Answer:
The process shown is formation of mineral oil and natural gas.

Question b.
Explain the process.
Answer:

1. Mineral oil is the liquid fuel formed by the decomposition of organic substances buried underground.
2. Millions of years ago, bodies of dead sea organisms sank to the bottom of the sea.
3. Layers of soil and sand collected on them.
4. Due to high pressure and temperature the remains of the dead organisms were transformed into mineral oil.
5. The underground mineral oil is extracted through oil wells.

Question c.
What are the gaseous substances formed in the above process?
Answer:
Natural gas is also formed along with mineral oil. It contains methane, ethane, propane and butane gases.

Question d.
When the products of the process is refined, what other components are produced?
Answer:
When mineral oil is refined by fractional distillation products produced are petrol, diesel, kerosene, naphtha lubricating oil, tar, etc.

Balbharti Maharashtra State Board Class 7 Science Solutions Chapter 15 Materials We Use Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 7 Science Solutions Chapter 15 Materials We Use

Class 7 Science Chapter 15 Materials We Use Textbook Questions and Answers

1. Fill appropriate terms in the blanks:
(white cement, soap, detergent, wearing of bones, tooth decay, hard, soft, portiand, fatty acid)

Question a.
The substance that helps water to remove dirt from the surface of material is called …………… .
Answer:
soap

Question b.
Fluoride is used in toothpaste to prevent …………… .
Answer:
tooth decay

Question c.
Soap is a salt of …………… and sodium hydroxide.
Answer:
fatty acid

Question d.
Synthetic detergents can be used in …………… water as well.
Answer:
hard

Question e.
For construction purposes …………… Cement is the most commonly used cement.
Answer:
white cement

2. Write answers to the following questions. 

Question a.
How does the use of a detergent help to clean soiled clothes?
Answer:

1. A molecule of a detergent holds on to a water molecule at one end and an oil molecule at the other.
2. As a result the molecules of oil mix with the water.
3. This is how detergent acts on our soiled clothes. So detergent removes any oil or dirt sticking on to our clothes.
4. Due to the property of holding on to both oil and water, soap water spreads easily on many types of surfaces.
5. This property of spreading on a surface is called surface activity.
6. Detergents are surface active.
7. One effect of surface activity is lather formation.

Question b.
How will you check with the help of soap powder whether water is hard?
Answer:

1. In the hard water, (of a well or a tube-well), soap does not give lather but forms a scum.
2. As a result, soap loses its cleansing property. So with help of soap we will come to know that it is a hard water.

Question c.
What are the important ingredients of a tooth paste and what is the function of each?
Answer:

1. The important ingredients of a toothpaste are calcium carbonate and calcium hydrogen phosphate.
2. They remove the dirt on teeth. These ingredients also polish the teeth.
3. A certain proportion of fluoride in the tooth paste helps prevent tooth decay.
4. It is essential for the enamel covering of teeth.

Question d.
What are the ingredients of cement?
Answer:

1. Cement is a dry, greenish grey powder with fine particles.
2. It is made from silica (sand), alumina (aluminium oxide), lime, iron oxide and magnesia (magnesium oxide).

Question e.
What will happen if cement is not used in making concrete?
Answer:

1. In making concrete strong, the ingredients cement, water, sand and gravel should usually be mixed in the ratio of 1 : 2 : 3 : 0.5 to achieve maximum strength.
2. If enough cement is not used then the concrete will eventually fall apart, as cement is used as a binding agent.

Question f.
Make a list of detergents, that you use. Answer: There are two types of detergents that we use, (a) Natural (b) Man-made detergents.

1. Natural detergents are soap nut (ritha) soap pod (shikekai).
2. Man-made detergents are soap, hard soaps, soft soaps.
3. Synthetic detergents have taken the place of soap.
   • Detergents are commonly available as powders or concentrated solution.
   • Detergents are for laundry, washing clothes and cleaning dishes.
4. Alkaline detergents used for hard surface cleaning.

Question g.
What should be expected from a detergent for delicate garments?
Answer:

1. Detergents should not be strong, they may spoil the texture, colour of delicate garments.
2. Now a days many detergents are available especially for woollen, delicate clothes.
3. They should not contain bleach, phosphorous which will harm delicate clothes.

Question h.
What is meant by surface activity? Name three chemicals responsible for the surface activity of various detergents.
Answer:

1. Due to the property of holding on to both oil and water, soap water spreads easily on many types of surfaces.
2. The property of a substance of spreading on a surface is called surface activity and the substance is called surfactant.
3. Detergents are surface active.
4. They increase the spreading and wetting ability of water by reducing its surface tension.
5. Chemicals responsible for the surface activity of various detergents is phenol, Aprotinin.

3. What are the similarities and differences between:

Question a.
Natural detergents and Man-made detergents
Answer:

Natural detergents	Man-made detergents
1. Soap nut (ritha) and soap pod (shikekai) are the natural detergents.	1. Soap is man-made detergent soft soap and hard soap.
2. Natural detergents do not have harmful effect on human skin or on silk or woollen clothes.	2. Soap has effect on skin and cloth because it has chemicals in it.
3. Soap nut, soap pod contain a chemical saponin.	3. Soap has acid in it, soap is sodium and potassium salt of fatty acids.
4. It is naturally available.	4. It is man made using chemicals and oil.

Question b.
Soap and Synthetic detergents
Answer:

Soap	Synthetic detergents
1. Soap is man-made detergent, it is in use since ancient times.	1. Synthetic detergent have taken the place of soap.
2. Soap loses its cleansing property in hard water it does not give lather.	2. Synthetic detergent can be used in hard water also.
3. Soap was prepared by using animal fat and wood ash.	3. Synthetic detergent are obtained by subjecting fats, kerosene to various chemical processes.
4. Variety of soaps are available, soft soap for bathing, hard soap for washing, cleaning.	4. Variety of synthetic detergents are available – Ariel, Surf Excel, etc.

Question c.
Bath soap and Soap for washing clothes
Answer:

Bath soap	Soap for washing clothes
1. Soft soap is used for bathing.	1. Hard soap is used for washing clothes.
2. Soft soap is potassium salt is fatty acids.	2. Hard soap is sodium salt of fatty acid.
3. Soft soap dissolves more easily readily in water.	3. Hard soap do not dissolve easily in water.
4. Now a days many perfumes, moisturizes are mixed to make it more attractive and useful.	4. In this type of soap now a days germicides, anti foaming agents are mixed to make it more useful.

Question d.
Modern cement and Ancient cement
Answer:

Modem cement	Ancient cement
1. Cement manufactured from 60% lime, silica 25% and alumina 5%. the rest is iron oxide and gypsum.	1. Romans used to make aqueous cement by mixing volcanic ash in moistened lime. It was very durable.
2. It is the most commonly used cement for Construction work.	2. It is Roman cement volcanic ash prevent cracks from spreading.
3. It is called Portland Cement.	3. It is called Aqueous Cement.

4. Explain why –

Question a.
Soap cannot be used in hard water.
Answer:

1. In the hard water of a well or a tube well, soap does not give lather but forms a scum.
2. As a result soap loses its cleansing property. So soap cannot be used in hard water.

Question b.
Oil does not mix in water. However, oil and water become homogenous if a sufficient quantity of detergent is added.
Answer:

1. A molecule of a detergent holds on to a water molecule at one end and an oil molecule at the other.
2. As a result the molecules of oil mix with the water, and we will see that the water and oil have become homogenous and the colour of the mixture appears milky.

Question c.
Synthetic detergents are superior to soap.
Answer:

1. Soap is a man-made detergent which has been in use since ancient times.
2. It was prepared by using animal fat and wood ash. In hard water, soap does not give lather, it loses its cleansing property.
3. So we can not use soap in hard water. Now synthetic detergents have taken the place of soap.
4. They can be used in hard water as well
5. Synthetic detergents have many more advanced properties like they are added with perfumes, conditioner for fabric, etc.

Question d.
Often coloured spots are formed on clothes during washing.
Answer:

1. Curry stains stick fast to the criss-crossing threads of the material of our clothes.
2. Curry contains turmeric a natural indicator which turns red in a basic solution.
3. Soaps are sodium salts of fatty acids and are basic in nature.
4. While washing the clothes, turmeric reacts with soap solution and turns red forming red spots on the clothes.
5. But the spots disappear after washing the clothes with plenty of water.

Question e.
Tobacco masheri should not be used for cleaning teeth.
Answer:

1. Masheri is the smokeless form of tobacco. It is tobacco, containing teeth cleaning powder
2. It contains tobacco leaves.
3. Tobacco contains toxic and Carcinogenic chemicals which can cause cancer, oral cancer, mouth and throat cancer, gum disease, tooth decay.
4. Its use can cause abnormal delivery in pregnant women.

Project:

Question 1.
Visit a cement factory. See how cement is prepared and discuss the process.

Question 2.
Write a conversation based on cement houses, mud-houses and wattle-and-daub houses.

Class 7 Science Chapter 15 Materials We Use Important Questions and Answers

Fill in the blanks:

Question 1.
The principal ingredients of a toothpaste are ………………. and ………………. which remove the dirt on the teeth.
Answer:
Calcium carbonate, calcium hydrogen phosphate

Question 2.
………………. in the toothpaste helps prevent tooth decay.
Answer:
Fluoride

Question 3.
The property of a substance of spreading on a surface is called ………………. .
Answer:
surface activity

Question 4.
………………. and ………………. are the natural detergent in common use.
Answer:
Soap nut, Soap pod

Question 5.
Soap nut and soap pod contain a chemical named ………………. .
Answer:
Saponin

Question 6.
………………. is a man-made detergent.
Answer:
Soap

Question 7.
………………. is used for washing clothes.
Answer:
Hard soap

Question 8.
………………. is used for bathing.
Answer:
Soft soap

Question 9.
Hard soap is ………………. salt of fatty acids.
Answer:
Sodium

Question 10.
Soft soap is ………………. salt of fatty acids.
Answer:
Potassium

Name the following:

Question 1.
A substance which is spread on a given surface and used for cleaning.
Answer:
Surfactant

Question 2.
A chemical contained in soap nut and pod.
Answer:
Saponin

Question 3.
An element which helps prevent tooth decay which is used in toothpastes.
Answer:
Fluoride

Question 4.
The latin word which means detergent.
Answer:
Detergere

Question 5.
A cement used for construction purpose.
Answer:
Portland cement

Question 6.
A mixture of cement, water, sand and gravel.
Answer:
Concrete

Question 7.
A natural detergent.
Answer:
Soap nut

Choose the correct option:

Question 1.
Which one of these material grows on an animal
(cotton, rubber, wood, wool)
Answer:
Wool

Question 2.
Which of these is man-made?
(oranges, apples, plastic bags, tomatoes)
Answer:
Plastic bags

Question 3.
The statue is made from marble, marble is a ………….. material.
(weak, elastic, man-made, natural)
Answer:
Natural

Question 4.
Toy Duck is made from plastic. Plastic is a ………….. material.
(natural, man-made, raw, precious)
Answer:
Man-made

Question 5.
Which of these materials is natural?
(Nylon, Rock, Plastic, Polythene)
Answer:
Rock

Question 6.
Which one of these is a natural material?
(Lemonade, Cola, Water, Ice cream)
Answer:
Water

Question 7.
The toy plane made from wood. Wood is a ………….. material.
(man-made, natural, weak)
Answer:
Natural

Question 8.
Which one of these materials is natural?
(Nylon, cotton, polythene, polyesters)
Answer:
Cotton

Match the following:

Question 1.

Column ’A’	Column ’B’
1. Fluoride	a. Man-made detergent
2. Soap nut	b. Sodium salt of fatty acid
3. Soap	c. Man-made material
4. Cotton	d. Prevents tooth decay
5. Nylon	e. Potassium salt of fatty acid.
6. Hard soap	f. Natural detergent
7. Calcium carbonate	g. Natural material
8. Soft soap	h. Main ingredients of toothpaste

Answer:

Column ’A’	Column ’B’
1. Fluoride	d. Prevents tooth decay
2. Soap nut	f. Natural detergent
3. Soap	a. Man-made detergent
4. Cotton	g. Natural material
5. Nylon	c. Man-made material
6. Hard soap	b. Sodium salt of fatty acid
7. Calcium carbonate	h. Main ingredients of toothpaste
8. Soft soap	e. Potassium salt of fatty acid.

Find out:

Answer the following questions:

Question 1.
What is the source of the fluoride in a tooth paste or tooth powder?
Answer:
A naturally occurring mineral found in tooth paste and drinking water. Sodium Fluoride (NaF) is the source of fluoride in toothpaste.

Question 2.
Note down all the information given on a tooth powder/toothpaste container or carton and discuss.
Answer:
1. The carton shows the name of the company and name of toothpaste and its contains all the ingredients present in toothpaste.

2. Licence No. of company, Regd. Trade Mark of Colgate Palmolive Co-manufactured by Colgate-Palmolive (India) Ltd. Licenced user of Trade Mark made in India. Tooth paste contains 1000 ppm max of available fluoride when packed.

3. Ingredients: Calcium carbonate, sorbitol, sodium lauryl sulphate, silica, sodium silicate flavour, sodium monoflouro phosphate, sodium bicarbonate, benzyl alcohol.

4. Direction for use: Brush thoroughly atleast twice a day.
5. Children under 6 years of age should have adult supervision and use only appropriate amount.

Question 3.
Now a days why are the roads made of concrete?
Answer:

1. Concrete is prepared by mixing cement, limestone, sand, gravel, and water. It is solid, more durable and strong.
2. There is no erosion for many years and roads are smoother. So the roads are made of concrete.

Question 4.
What causes the hardness of water?
Answer:

1. Hardness is a measure of amount of dissolved salts in water.
2. It is caused by dissolved salts like carbonates, chlorides mostly of calcium and magnesium
3. Presence of these makes washing of clothes by soap difficult.
4. Hard water is water that has high mineral content.
5. Hard water is formed when water percolates through deposits of limestone and chalk.

Can you tell?

Answer the following questions:

Question 1.
Which substances were used earlier for cleaning teeth?
Answer:
In olden times neem twigs, coal powder ash, tooth powder, salt, pomegranate rind, were used for cleaning teeth.

Question 2.
What do we use today to clean our teeth?
Answer:
Now a days we use variety of toothpastes and tooth powders to clean our teeth.

Question 3.
What do we use for cleansing our body?
Answer:
Soap, many liquid body wash are also used to clean our body.

Question 4.
What are the materials used for construction?
Answer:
Metals, wood, stone, cement, concrete, timber, bricks, metal sheet, soil, Earth, marble, aluminium, iron, steel, bamboo, glass, plastic.
Concrete: is a wet mixture of sand, gravel, cement, and water used to create building foundations, footpaths or roads.

Question 5.
Which of the houses seen in the pictures here have a strong structure? Why?

Answer:
The houses made from stone, bricks, and cement and concrete have a strong structure.

Write short notes on or Explain:

Question 1.
Natural detergent
Answer:

1. It is naturally available soap nut (ritha) and soap pod (shikekai) are the natural detergents in common use.
2. They contain a chemical named saponin.
3. Soap nut and soap pod do not have any harmful effect on human skin or on silk, woollen threads, and cloth.

Question 2.
Man-made detergents
Answer:

1. Detergent which is made by processing naturally available material, soap is a man-made detergent which has been in use since ancient times.
2. In those days soap was prepared by using animal fat and wood ash.
3. Therefore two types of soap (a) Hard Soap is used for washing clothes. It is a sodium salt of fatty acids, (b) Softsoap is used for bathing. It is a potassium salt of fatty acids.
4. It does not cause irritation of the skin.
5. But we can’t use soap in hard water because soap does not give lather but forms a scum. So, soap loses its cleansing property so now synthetic detergent have taken the place of soap.
6. Synthetic detergents are obtained by subjecting these raw materials (fats and kerosene) to a variety of chemical processes. These can be used in hard water as well.

Question 3.
Soap
Answer:
Two types of soap are:
1. Hard soap is used for washing clothes. It is a sodium salt of fatty acids.
2. (a) Softsoap is used for bathing. It is a potassium salt of fatty acids, (b) It does not cause irritation of the skin, (c) But we can’t use soap in hard water because soap does not give lather but forms a scum, (d) So, soap loses its cleansing property so now synthetic detergents have taken place of soap, (e) Synthetic detergents are obtained by subjecting these raw materials (fats and kerosene) to a variety of chemical processes, (f) These can be used in hard water as well.

Question 4.
Concrete
Answer:

1. Concrete is prepared by mixing cement, water, sand and gravel.
2. For making a strong and leak proof slab certain substances are mixed in concrete.
3. Now a days, roads are made of concrete because they are very durable, strong and smooth.

Question 5.
Surface activity
Answer:

1. Soap molecule has the property of holding on to both oil and water soap water spreads easily on many types of surfaces.
2. The property of a substance of spreading on a surface is called surface activity and the substance is said to be a surfactant.
3. Detergents are surface-active. One effect of surface activity is lather formation.

Question 6.
Explain the method of preparation of soap.
Answer:
Material required for preparation soap are 15 g sodium hydroxide, 60 ml coconut oil, 15 g salt, perfume, a glass rod, beaker, tripod, wire gauze, burner, water mould etc.
Procedure:

1. Take 60 ml of coconut oil in a beaker.
2. Dissolve 15 g sodium hydroxide in 50 ml water. Mix the sodium hydroxide solution in the oil slowly, while stirring with a glass rod.
3. Heat the mixture, and boil it for 10 – 12 minutes, stirring it all the while.
4. Take care that the mixture does not boil over while heating.
5. Dissolve 15 g salt in 200 ml water, pour this solution into the above mixture and stir.
6. The soap formed by the chemical reaction now floats on the water. After some time, it becomes thick.
7. Now separate the thick soap and add the perfume to it, shape the bar of soap using the mould.
8. In this process, fat and alkali combine to form salts of fatty acids.
9. Chemically, soap is a sodium or potassium salt 4 of fatty acids.