The stage of silk worm when it synthesizes silk is

Solution(By Examveda Team)

The stage of silk worm when it synthesizes silk is IV^th instar larvae and V^th instar larvae.
The life cycle of mulberry silkworm completes in 45 - 55 days, consisting of stages egg, larva, pupa and moth. The egg stage is lasting for 9 - 10 days, a larval stage is 24 - 28 days, the pupal stage 8 - 10 days, and the moth stage 3 - 4 days.
The female silkmoth lays 300 to 500 eggs. The silkmoth eggs hatch to form larvae or caterpillars, known as silkworms. The larvae feed on mulberry leaves. Having grown and moulted several times, the silkworm extrudes a silk fibre and forms a net to hold itself.