Silk — Sericulture

• Silk — natural animal fibre from silkworm (Bombyx mori) cocoon.
• Sericulture — rearing silkworms for silk; important in Karnataka, WB, Assam.
• Silkworms feed on mulberry leaves.
• Cocoon — continuous filament of protein (fibroin) spun by larva.
• Reeling — unwinding filaments from cocoons in hot water.
• Paithani, Banarasi, Kanchipuram — famous Indian silk traditions.

Level 1 — Core idea

1. Life cycle — egg → larva (caterpillar) → pupa in cocoon → moth (moth breaks cocoon if not boiled).

2. Mulberry silk — most common; silkworms eat mulberry leaves exclusively.

3. Cocoon boiling — kills pupa, preserves continuous filament for reeling.

Level 2 — Process and representation

1. Diagram (text) — mulberry bush → silkworm → cocoon → reel → silk yarn.

2. Properties — smooth, strong, lustrous, poor conductor of heat (comfortable).

3. Raw silk vs spun silk — broken filaments spun together.

Level 3 — Applications and NCERT links

1. Real world — Mysore silk factory; silk sarees for weddings.

2. NCERT — map silk-producing states in India.

3. Ahimsa silk — cocoon cut after moth leaves (ethical alternative).

Tracing silk from mulberry farm to saree

Step 1 — Farmers grow mulberry leaves in Karnataka/W Bengal.
Step 2 — Silkworm eggs hatch; larvae fed fresh mulberry leaves 4–5 times daily.
Step 3 — Larva spins cocoon around itself in 3–4 days.
Step 4 — Cocoons sorted; stifling (heat) prevents moth emergence.
Step 5 — Reeling in water bath → long silk filaments wound on reels.
Step 6 — Twisting into yarn; dyeing with traditional colours.
Step 7 — Weaving on handloom → Kanchipuram pattu saree.
Conclusion: silk production is labour-intensive traditional industry in India.

• What do silkworms eat?
• Define sericulture.
• Name two Indian states famous for silk.
• Why are cocoons boiled before reeling?
• Is silk plant or animal fibre?
• What is sericulture?

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