Question

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

• A. Boiling makes the silk strands longer.
• B. Boiling breaks the long threads into more manageable lengths.
• C. Pupa dies by boiling and silk fibre becomes loose.
• D. Boiling helps incubate the cocoon.

Answer 1

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.