A) from outside to inside in one half on the cocoon and from inside to outside in other half of the cocoon
B) at random
C) from inside to outside
D) from outside to inside
Correct Answer: D
Solution :
In silkworm, mature caterpillar stops feeding and returns to a corner of mulberry leaves. Its salivary glands now secrete a sticky fluid. This sticky substance turns into a solid silk thread in contact with air. It spin silk from outside to inside around its body.
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