33 Science -- Invertebrates

What is cocoon? How it is produced?

What is cocoon? How it is produced?

A cocoon is the spherical cover of the pupa of a silkworm inside which pupa remains passive.
When larva is fully grown up, I develops a pair of salivary glands which secretes liquid silk. On emerging, the liquid silk hardens and forms a silk fibers. The silk fibers to wrap around the body of the caterpillar to form a cocoon. In this way, cocoon is produced.

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