Question

From where cocoon is formed?​

Answer 1

Cocoon formation starts after copulation when ovary matures. A membrane is secreted around the clitellum by membrane secreting glands. ... The structure now is called cocoon. Inside the cocoon one sperm get fertilized with ova to form zygote.

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if you want short answer, so your answer is,

The cocoon is formed bu silkworm........