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Processing of Silk Fibre

Once silkworm...

Question

Once silkworms produce cocoons, they are immediately transferred to boiling water. Explain why?

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Solution

Cocoons are immediately transferred to boiling water because:
To obtain smooth and continuous thread from cocoons, they are placed in boiling water.
Silk is produced from cocoons through a series of procedures.
The silkworm larvae are killed and the upper layers of the cocoon are softened by steam (hot boiling water vapors), which allows the cocoons to be preserved unaltered for up to 10 days.

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Q. Steps to produce silk are given below in a jumbled order. Arrange them in their proper sequence.
(a) Eggs are warmed to a suitable temperature for the larvae to hatch from eggs.
(b) Fibres are taken out from the cocoon.
(c) After 25 to 30 days, the caterpillars stop eating and start spinning cocoons.
(d) The larvae/caterpillars or silkworms are kept in clean trays along with freshly chopped mulberry leaves.
(e) Female silk moths lay eggs.
(f) Cocoons are kept under the sun or boiled in water.

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