Fabric from Fibre is a chapter in the class 7 science book. This chapter talks about the process of manufacturing fabric from fibres. How fibres are obtained from plants and animals, the role of animals in the fabric manufacturing process.
We have given solutions to all the questions of Chapter 14, Fabric from fibre from DAV Class 7 science textbook. If you have any doubts you can ask us through the comments section or whatsapp using the Whatsapp chat button on this page.
Fibre From Fabric Solutions DAV Class 7 Science
A. Fill in the blanks.
1. The hairy body coat of sheep and goat is called ___________.
2. Shaving off the body coat of sheep is called ___________.
3. Cleaning of fleece to remove dirt and grease is called ___________.
4. The process of separating hair, of different textures, from the fleece, is called ___________.
5. The rearing of silkworms to obtain silk is called ___________.
6. ___________ is the process of separating silk fibres from cocoons.
7. The silk thread is made up of ___________.
Ans A.
1. Fleece
2. Shearing
3. Scouring
4. Sorting
5. Sericulture
6. Reeling
7. Protein
B. Write True or False for the following statements.
1. Synthetic fibres are manufactured in factories.
2. Air is a good conductor of heat.
3. Scouring is the process of removal of fleece of sheep.
4. The process, of twisting of raw and dyed fibre, is known as sorting.
5. Silkworm’s feed on mulberry leaves.
6. The larvae secrete very fine filaments made of protein.
7. Reeling is the process of getting silk fibres from cocoons.
Answer B:
(1) True
(2) False
(3) False
(4) False
(5) True
(6) True
(7) True
C. Tick the correct option.
1. The process, of removing fleece along with a very thin layer of the dead skin of sheep, is called?
Answer: Shearing is the process of removing fleece along with a very thin layer of the dead skin of sheep.
2. Which of the following animals does not yield wool?
Answer: Buffalo doesn’t yield wool.
3. The caterpillars of silkworms feed on
Answer: Caterpillars feed on the mulberry leaves
4. The egg of a silk moth hatches into a
5. The process of taking out silk threads from the cocoon is called
Answer: The process of taking out silk threads from the cocoon is called Reeling.
D. Answer the following questions in brief.
1. Name three animals whose fleece is used for making woolen fibres.
Answer: sheep, goats, and Rabbits are used for making woolen fibres. Angora wool comes from angora rabbits.
2. Name three common varieties of wool.
Answer: Angora wool, pashmina & shahtoosh are some common varieties of wool.
3. Give the meaning of the term: ‘sorting:
Answer: Sorting is the term used for the process of separating different types and textures of hair from the fleece of animals.
4. Define the term: ‘sericulture.
Answer: Sericulture is the process of rearing of the silkworms in order to obtain silk from them.
5. How is silk fibre obtained from cocoons?
Answer: Cocoons are put close to hot water and steam which helps to separate silk from their body.
6. Name two countries in which silk is produced on a large scale.
E. Answer the following questions.
1. How do woolen clothes keep us warm in winter?
Answer: Woolen clothes traps wool traps air between them. The air is a poor conductor of heat, the heat remains intact and trapped between the woolen layers. So, this way our body stays warm when we wear woolen clothes.
2. Describe the purpose of ‘scouring’ in the production of wool?
Answer: The main aim of scouring in the production of wool is to remove dust, dirt and grease from the fleece obtained from animals. They are put in hot water and washed with detergents and cleaners.
3. State the practical uses of the (a) long (b) short yarn threads, obtained during the making of wool.
Answer: The longer threads obtained from the wool are used in making of sweaters, mufflers, woolen caps, gloves, woolen socks, etc.
The shorter threads are used for making coats, woolen shawls and woolen jackets.
4. Write a short note on ‘rearing of silkworms’.
Answer: The process of rearing of silkworms is known by the name Sericulture. A female moth is reared which lays 100s of eggs and then they are sold to silkworms. These silkworms feed on the mulberry leaves for around 1 month. They hatch to form caterpillars.
The silkworms are then exposed to steam and the rearing process is done to extract silk from their body.
5. Describe the different stages in the life cycle of a silk moth.
Egg: The female silk moth lays 100s of eggs. These eggs are kept under warm conditions and then they hatch
Silkworm Larva: The silkworm is produced from the hatched eggs. This is the second stage of the life cycle of the silk moth
Cocoon: This stage of the silk moth life cycle occurs after a period of 30 days when they continuously feed on the mulberry leaves.
Silk Moth: The development of the silkmoth from the cocoon stage takes occurs after a period of 10 to 15 days. The pupa then fully transforms into a silk moth.
So, these were Fabric from fibre solutions from DAV Classs 7 science text book. If you are facing issues, in any of the questions feel free to ask us through the comments section. You can also chat with us on Whatsapp using the chat button in bottom of the page. Stay tuned to Careeradvice4u
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