It is necessary to kill pupa by boiling cocoon in water at right time. Why
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it is necessary to boil the cocoon and kill pupa because to make a continues thread of silk we need to kill it otherwise pupa grows and break the cocoon and we will not get a continues thread hence it is necessary and we cant avoid it
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If the pupae are allowed to chew their way out of the cocoons, the silk is reduced to short lengths of little use to humans. Trying to unwrap the silk from a living pupa that hadn't completed the pupal stage would also likely kill it. Boiling water kills the pupae quickly, while making the silk easier to unwind.
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