What is the primary reason to boil the cocoons of the silkworm?

Boiling makes the silk strands longer.

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Boiling breaks the long threads into more manageable lengths.

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Pupa dies by boiling and silk fibre becomes loose.

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Boiling helps incubate the cocoon.

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Solution

The correct option is C Pupa dies by boiling and silk fibre becomes loose.
Following are the steps to obtain the silk fibres:
-Larva spins the silk thread formed by their secretion around itself and forms the cocoon.
- Larva binds the silk thread very firm. This makes it difficult to extract fibres.
- Boiling kills the pupa and thus silk fibres get loose.

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Similar questions

How do the silk farmers know that when to boil the cocoons and when to get the silk thread off

Choose the option that correctly arranges the statements given below in order with respect to silk worm rearing.

I.Eggs are bought and incubated under controlled conditions

II. Silk cocoons are boiled

III. Silk fibres are extracted

IV. Egg hatch into larvae

V. Larvae weave a cocoon around themselves to metamorphose

VI. Larvae are fed mulberry leaves making them grow

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