Question

A. Answer in Detail
1. Differentiate between plant and animal fibres.
2. How is wool obtained from sheep?
3. Explain the life cycle of silk moth.
4. How are silk fibres obtained from cocoons?
5. How do silkworms spin cocoons?​

Answer 1

Answer:

1 .Plant fibres are the fibre which are obtained from plants whereas, Animal fibres are fibres which are obtained from animals. Plant fibres are fibres which are obtained plants. Such as cotton and jute while animal fibres are fibres which are obtained from animal sources. Such as silk and wool.

2.Wool is mainly obtained by shearing fleece from living animals, but pelts of slaughtered sheep are sometimes treated to loosen the fibre, yielding an inferior type called pulled wool. ... Wool fibre is chiefly composed of the animal protein keratin.

3. Life Cycle of Silk Moth. The female silk moth lays about 300 to 400 eggs at a time. The eggs hatch and the caterpillars or silkworms emerge. ... Inside the cocoon, the silkworm enters the second stage of its life (called the pupa) and then the third and final stage to become an adult moth.

4.Cocoons are collected and kept under the sun, or boiled, or exposed to steam. This helps in separating out the silk fibres. The process by which silk thread is separated from the cocoon is called reeling the silk.

5. When the silkworm ate great quantities of mulberry leaves, they were digested and nutrients were sent into the bloodstream. The silk glands absorbed these nutrients. The larva has a small spinneret on its lip, through which the silk emerges. ... The silkworms spin their cocoons inside these frames

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