Question

why are cocons stiffed​

Answer 1

Answer:

If cocoon isn't stiffled the larvae inside them won't die and later the moth comes out and fly away therefore we can't get thread

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Answer 2

$\mathfrak{\huge{\blue{\underline{\underline{★ Aditya ★}}}}}$

Stifling treatments are applied to silk cocoons in order to kill the pupae, preventing the emergence of moths and allowing to preserve the silk during long periods of time.