Question

explain the formation of cocoon ​

Answer 1

Answer:

A cocoon is a covering of silky threads that the larvae of moths and other insects make for themselves before they grow into adults. Cocoons and chrysalides are protective coverings for the pupa. The pupa is the intermediate stage between the larva and adult. A moth makes a cocoon, which is wrapped in a silk covering.

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Answer 2

Answer and Explanation:

Explain the process of cocoon formation in silkworms.

• The cocoon is formed by a caterpillar.
• The silk moth lays 300-500 eggs in cluster. The egg hatch into larvae within 10 days.
• The larvae undergo 4-5 moults and develop into a caterpillar.
• Caterpillar is voracious feeder and it feeds on fresh mulberry leaves.
• After 3-6 days of feeding the caterpillar becomes inactive, stops feeding and secretes a fibre through the mouth from silk glands.
• Such caterpillars are seperated and kept in other baskets.
• These caterpillars within 2-3 days produce a fibrous cover around themselves. It is known as cocoon.
• A single caterpillar produces 1000-1500 m long continuous fibre. This process of formation of cocoon is known as spinning.