Question 2. Answer the following in brief:
(a) The cut off'wool coat' of a sheep (along with a thin layer of skin is
called.
(b) What are silk fibres made up of?
(c) Coarse wool is obtained from which breed of sheep and in which
state of India it is found?
(a) Name two fibres which are made up of protein?
Question 3. Explain why woollen garments keep us warm in winter?
Question 4. Why shearing is done before winter season?
Question 5. Why shearing does not hurt the sheep?
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Question 6. What are occupational hazards? Name one occupational
hazard.
Question 7 How will you distinguish between natural silk & Artificial
silk?
Question 8..Draw well labelled diagram of life history of silk moth in sequence
Answers
Answer:
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Explanation:
A2. a.Once a sheep develops a thick coat of hair, it is shaved off to obtain wool. The process of cutting off the woollen fleece of sheep with a thin layer of skin is called shearing. It is done by the machines similar to those used by barbers to remove hairs.
b. The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori reared in captivity (sericulture).
c. Marwar region, Rajasthan Ajmer District, Rajasthan Udaipur District, Rajasthan
d. A natural or synthetic fiber composed of protein. Natural proteins fibers include wool, hair, fur, and silk. Synthetic, or regenerated proteins fibers are generically called azlon fibers
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Answer:
2.
a)shearing
b)The fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons
c)The Marwari is an Indian breed of domestic sheep and found in rajasthan and Gujarat.
a) Natural or synthetic fiber composed of protein.