A) cocoon/pupa
B) caterpillar
C) adult moth
D) both egg and adult moth
Correct Answer: A
Solution :
Commercial silk is obtained by putting cocoons (i.e. caterpiller covered by silk thread) in hot water or treating them with fumigation. The pupae are killed and the cocoons are assorted according to their colours. After assorting the thread is first un winded and then winded with the help of wheels.
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