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. The life cycle of silk moth starts when a female silk moth lays eggs. The caterpillar or larvae are hatched from the eggs of the silk moth. The silkworms feed on mulberry leaves and give rise to pupa. In the pupa stage, a weave is netted around by the silkworm to hold itself.
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. Then, the spinning of silk fibres into threads is done.
5. 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.

Explanation:

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