NCERT Solutions for Class 7 Science Chapter 3 Fibre to Fabric
You will find NCERT Solutions for Class 7 Science Chapter 3 Fibre to Fabric are prepared as per the accordance of latest CBSE guidelines so you can score maximum marks. In the examinations, you will can come up with better answers and lay out the main point effectively. Your marks play an important role in shaping future thus these NCERT Solutions for Science will become your comprehensive guide in easy learning and evaluating yourself.
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NCERT Solutions for Class 7 Science Chapter 3 Fibre to Fabric
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Page No: 32
Exercises
1. You must be familiar with the following nursery rhymes:
(i) ‘Baa baa black sheep, have you any wool.’
(ii) ‘Mary had a little lamb, whose fleece was white as snow.’
Answer the following:
(a) Which parts of the black sheep have wool?
(b) What is meant by the white fleece of the lamb?
Answer
(a) The hairy skin i.e. fleece of the black sheep have wool.
(b) White fleece means the white coloured hair of the lamb.
2. The silkworm is (a) a caterpillar, (b) a larva. Choose the correct option.
(i) a
(ii) b
(iii) both a and b
(iv) neither a nor b
Answer
► (iii) both a and b
3. Which of the following does not yield wool?
(i) Yak
(ii) Camel
(iii) Goat
(iv) Woolly dog
Answer
► (iv) Woolly dog
4. What is meant by the following terms?
(i) Rearing
(ii) Shearing
(iii) Sericulture
Answer
(i) Rearing : It means taking care of herds of animals which includes feeding, grazing, breeding, etc. for economical purpose like meat and other useful products.
(ii) Shearing : The removal of fleece of the sheep along with a thin layer of skin from its body is called shearing.
(iii) Sericulture : The rearing of silkworms to obtain silk economically is called sericulture.
5. Given below is a sequence of steps in the processing of wool. Which are the missing steps? Add them.
Shearing, __________, sorting, __________, __________, _________.
Answer
Shearing, scouring, sorting, burrs picking, dying, rolling
6. Make sketches of the two stages in the life history of the silk moth which are directly related to the production of silk.
Answer
The two stages in the life history of the silk moth which are directly related to the production of silk:
(a) Which parts of the black sheep have wool?
(b) What is meant by the white fleece of the lamb?
Answer
(a) The hairy skin i.e. fleece of the black sheep have wool.
(b) White fleece means the white coloured hair of the lamb.
2. The silkworm is (a) a caterpillar, (b) a larva. Choose the correct option.
(i) a
(ii) b
(iii) both a and b
(iv) neither a nor b
Answer
► (iii) both a and b
3. Which of the following does not yield wool?
(i) Yak
(ii) Camel
(iii) Goat
(iv) Woolly dog
Answer
► (iv) Woolly dog
4. What is meant by the following terms?
(i) Rearing
(ii) Shearing
(iii) Sericulture
Answer
(i) Rearing : It means taking care of herds of animals which includes feeding, grazing, breeding, etc. for economical purpose like meat and other useful products.
(ii) Shearing : The removal of fleece of the sheep along with a thin layer of skin from its body is called shearing.
(iii) Sericulture : The rearing of silkworms to obtain silk economically is called sericulture.
5. Given below is a sequence of steps in the processing of wool. Which are the missing steps? Add them.
Shearing, __________, sorting, __________, __________, _________.
Answer
Shearing, scouring, sorting, burrs picking, dying, rolling
6. Make sketches of the two stages in the life history of the silk moth which are directly related to the production of silk.
Answer
Spinning of cocoon of silk threads around caterpillar.
Changing of caterpillar into pupa.
7. Out of the following, which are the two terms related to silk production?
Sericulture, floriculture, moriculture, apiculture and silviculture.
Hints: (i) Silk production involves cultivation of mulberry leaves and rearing silkworms.
(ii) Scientific name of mulberry is Morus alba.
Answer
Sericulture and moricultur
8. Match the words of Column I with those given in Column II:
Answer
Page No: 33
9. Given below is a crossword puzzle based on this lesson. Use hints to fill in the blank spaces with letters that complete the words.
Down
(D) 1 : Thorough washing
2 : Animal fibre
3 : Long thread like structure
Across
(A) 1 : Keeps warm
2 : Its leaves are eaten by silkworms
3 : Hatches from egg of moth
Changing of caterpillar into pupa.
7. Out of the following, which are the two terms related to silk production?
Sericulture, floriculture, moriculture, apiculture and silviculture.
Hints: (i) Silk production involves cultivation of mulberry leaves and rearing silkworms.
(ii) Scientific name of mulberry is Morus alba.
Answer
Sericulture and moricultur
8. Match the words of Column I with those given in Column II:
| Column I | Column II |
| 1. Scouring | (a) Yields silk fibres |
| 2. Mulberry leaves | (b) Wool yielding animal |
| 3. Yak | (c) Food of silk worm |
| 4. Cocoon | (d) Reeling |
| - | (e) Cleaning sheared skin |
Answer
| Column I | Column II |
| 1. Scouring | (e) Cleaning sheared skin |
| 2. Mulberry leaves | (c) Food of silk worm |
| 3. Yak | (b) Wool yielding animal |
| 4. Cocoon | (a) Yields silk fibres |
Page No: 33
9. Given below is a crossword puzzle based on this lesson. Use hints to fill in the blank spaces with letters that complete the words.
Down
(D) 1 : Thorough washing
2 : Animal fibre
3 : Long thread like structure
Across
(A) 1 : Keeps warm
2 : Its leaves are eaten by silkworms
3 : Hatches from egg of moth
Answer
Go Back To NCERT Solutions for Class 7 Science
Chapter 2 Nutrition in Animals Class 7 Science NCERT Solutions
NCERT Textbook will provide you with a lot of interesting topics thus these NCERT Solutions for Class 7 Science for Chapter 3 will be useful in understanding in depth concepts well. It will make you understand the topics in most simple manner and grasp it easily to perform better. These Class 8 Science NCERT Solutions will be quite helpful in making learning process and effortless and more effective.
Class 7 Science Chapter 3 Fibre to Fabric NCERT Questions and Answers - Topics
• Wool
→ Animals that yield wool
→ From fibres to wool
→ Processing fibres into wool
• Silk
→ Life history of silk moth
→ From cocoon to silk
Class 7 Science Chapter 3 Fibre to Fabric NCERT Questions and Answers - Notes
• Wool and silk fibres are obtained from animals. Wool is obtained from the fleece (hair) of sheep or yak. Silk fibres come from cocoons of the silk moth.
• Wool comes from sheep, goat, yak and some other animals. These wool-yielding animals bear hair on their body.
• Wool is derived from these hairy fibres. The hairy skin of the sheep has two types of fibres that form its fleece:
→ the coarse beard hair, and
→ the fine soft under-hair close to the skin.
• The process of selecting parents for obtaining special characters in their offspring, such as soft under hair in sheep, is termed ‘selective breeding’.
• Wool is also obtained from goat hair and camel hair.
• Processing fibres into wool
→ Shearing: The fleece of the sheep along with a thin layer of skin is removed from its body. This process is called shearing.
→ Scouring: The sheared skin with hair is thoroughly washed in tanks to remove grease, dust and dirt. This is called scouring.
→ Sorting: After scouring, sorting is done. The hairy skin is sent to a factory where hair of different textures are separated or sorted.
→ Cleaning of burrs: The small fluffy fibres, called burrs, are picked out from the hair. The fibres are scoured again and dried. This is the wool ready to be drawn into fibres.
→ Dyeing: The fibres can be dyed in various colours, as the natural fleece of sheep and goats is black, brown or white.
→ Rolling: The fibres are straightened, combed and rolled into yarn.
• The rearing of silkworms for obtaining silk is called sericulture.
• The female silk moth lays eggs, from which hatch larvae which are called caterpillars or silkworms.
• The caterpillar completely covers itself by silk fibres and turns into pupa. This covering is known as cocoon.
• The silk yarn (thread) is obtained from the cocoon of the silk moth.
• There is a variety of silk moths which look very different from one another and the silk yarn they yield is different in texture (coarse, smooth, shiny, etc.). Thus, tassar silk, mooga silk, kosa silk, etc., are obtained from cocoons spun by different types of moths.
→ The most common silk moth is the mulberry silk moth.
• A female silk moth lays hundreds of eggs at a time.
• The eggs are warmed to a suitable temperature for the larvae to hatch from eggs. This is done when mulberry trees bear a fresh crop of leaves.
• A pile of cocoons is used for obtaining silk fibres. The process of taking out threads from the cocoon for use as silk is called reeling the silk.
→ Silk fibres are then spun into silk threads, which are woven into silk cloth by weavers.
Chapter 3 Fibre to Fabric Class 8 Science Questions and Answers - MCQ Questions with answers
1. The process of removal of fleece from the body of sheep is called
(a) Cleaning
(b) Carding
(c) Shearing
(d) Removal
► (c) Shearing
2. Clothes does not protect us from which of the following condition?
(a) Heat
(b) Cold
(c) Blood pressure
(d) Dust and germs
► (c) Blood pressure
3. In which of the following processes new offspring with special characters is produced by selecting parents?
(a) Translation
(b) Selective breeding
(c) Separating
(d) Rearing
► (b) Selective breeding
4. Angora goats are found in
(a) Delhi and U.P
(b) Jammu and Kashmir
(c) Punjab and Goa
(d) Arunachal Pradesh and Karnataka
► (b) Jammu and Kashmir
5. Early man wears
(a) Clothes manufactured in mills
(b) Unstitched clothes
(c) Clothes made by hands
(d) Tree barks, leaves and animals skin
► (d) Tree barks, leaves and animals skin
6. Science of rearing silk is called
(a) Tissue culture
(b) Sericulture
(c) Agriculture
(d) Apiculture
► (b) Sericulture
7. In which process fleece of sheep with skin is/are removed?
(a) Shaving
(b) Refining
(c) Shearing
(d) All of the above
► (c) Shearing
8. Silk thread is obtained from
(a) Cocoon
(b) Caterpillar
(c) Pupa
(d) Adult moth
► (a) Cocoon
9. Which type of shawls are woven from the fur of Kashmir goat?
(a) Pashmina
(b) Parsi
(c) Kashmiri
(d) Simla
► (a) Pashmina
10. The industry related to fabric and clothing is called
(a) Fabric industry
(b) Agro industry
(c) Textile industry
(d) Petrochemical industry
► (c) Textile industry
You will get step by step and to the points answers of every question given inside the textbook. Chapter 3 NCERT Questions and Answers can be used to enrich knowledge and make lessons for learners more exciting. It will be useful in expanding student's horizon as it cover variety of questions.