Question
Describe the process of cocoon formation.
✓
Answer
- The eggs of silkworm hatch into larvae.
- The larvae develop into a caterpillar.
- Caterpillar feeds on fresh mulberry leaves.
- After its growth and moulting, the silkworm secretes a silk fibre to form cocoon.
- The silk is a continuous filament comprising fibroin protein, secreted from salivary glands of silkworm and a gum called sericin, which cements the filaments.
- The silk solidifies when it contacts the air.
- The silkworm spins approximately one mile of filament and completely encloses itself in a cocoon in about two or three days.
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