Question

please tell me the answer of no 4 and 5

Answer 1

Rearing of silk worm :-
Silkmoth is a large, white insect. It lays hundreds of eggs which are stored at a suitable temperature. Eggs hatch to produce larvae which are called caterpillar or silkworm. Caterpillar eats and grow and secrets a liquid. Liquids hardens on coming in contact with air and changes into a fine protein thread. Caterpillars cover itself with these fibres and form cocoon.
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Answer 2

1). Silkworm rearing is an extensive month-long exercise starting from egg stage and terminating in adults laying eggs and dying their natural death. the rearing of silkworm is called sericulture.During this course, they pass through five larval instars intervened by four moults, cocoon and pupal stage. after that they are soaked into water and they die, just than where cocoon is used to make silk.thx
2)Life Cycle of silk moth. The female silk moth  lays about 300 to 400 eggs at a time. The eggs hatch and the caterpillars or silkworms emerge. ... Inside the cocoon, the silkworm enters the second stage of its life (called the pupa) and then the third and final stage  to become an adult moth.