Write short notes.

Sericulture:

Sericulture refers to the rearing of silk worms in order to get silk.

i. Bombyx mori is the most commonly used variety for this purpose

ii. Thousands of eggs deposited by female moths are incubated artificially to shorten the incubation period.

iii. Larvae hatching out of eggs are released on mulberry plants. Larvae are nourished by feeding on mulberry leaves. After feeding for 3 – 4 days, larvae move to branches of mulberry plant.

iv. The silk thread is formed from the secretion of their salivary glands. Larvae spin this thread around themselves to form a cocoon.

v. Ten days before the pupa turns into an adult, all the cocoons are transferred into boiling water. due to the boiling water, the pupa dies in the cocoon and silk fibres become loose.

vi. These fibres are unwound, processed and reeled. Various kinds of fabric is woven from silk threads.