i want to ask that in some books it is written that the catterpillarleaves its cocoon when it becomes an adult moth and then that cocoon is collected to obtain silk.while in some books it is written that the cocoons are collected when the silk worms are still in it.
WHAT IS TRUE?

Dear student, 

You may refer to the answer provided by your friend.
@Divyanshu...Good work...Keep posting !!
 

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Cocoons are collected when the worms are inside it because if we collect the cocoons from which the worms are set free so the quality of the silk would be reduced.
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