A) Adult
B) Larva
C) Cocoon
D) Pupa
Correct Answer: B
Solution :
The fully grown caterpiller larva of Bombyx mori stops feeding and develops saliva-glands, then it undergoes pupation. In this, the larva secretes a sticky fluid through a narrow pore situated on the hypopharynx. This secreted fluid when comes in contact with air, takes the form of long thread of silk and s wrapped around the body of caterpillar in the form of a covering called as cocoon. The silk threads are then removed from cocoon after killing them. Hence, silk is secreted by caterpillar larva of silkworm but is obtained from the cocoon.
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