Silk is obtained from which stage of silkworm?

Statement (S) : Bird flu is an important disease affecting poultry birds.

Reason (R): The disease is caused by ${\mathrm{H}}_1{\mathrm{N}}_1$ virus.

The correct answer is

India has the distinction of producing all the four types of silk i.e., a) Mulberry silk (91.7%) b) Tasar silk (1.4%) c) Eri silk (6.4%) and d) Muga silk (0.5%) which are produced by different species of silkworms. Name the species that produces a large amount and least amount of silk in India.

Silk is obtained from