Which stage of silkworm secretes silk?

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(B) The fully grown caterpillar larva of $Bombyx$ $mori$ stops feeding and develops salivary glands,then it undergoes pupation.In this stage,the larva

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Larva

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(B) The fully grown caterpillar larva of $Bombyx$ $mori$ stops feeding and develops salivary glands,then it undergoes pupation.In this stage,the larva secretes a sticky fluid through a narrow pore situated on the hypopharynx.This secreted fluid,when it comes in contact with air,takes the form of a long thread of silk and is wrapped around the body of the caterpillar in the form of a covering called a cocoon.The silk threads are then removed from the cocoon after killing the pupa inside.Therefore,silk is secreted by the caterpillar larva of the silkworm.

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