Question

-------------- are immersed in hot water which loosens the silk filament​

Answer 1

Answer:

Explanation:

Cocoons are immersed in hot water so the silk fibres come of and the cocoons die. cocoon is immersed in hot water for softening the sericin so that to unwind the silk filament which goes as one fibre

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Answer 2

Cocoons are immersed in hot water which loosens the silk filament.