Question

Define the life cycle of silk worm with the help of well labelled diagram ?​

Answer 1

The female silk moth lays about 300 to 400 eggs at a time. The eggs hatch and the caterpillars or silkworms emerge. This is called the larval stage. The silkworm feeds on mulberry leaves.

The silkworm secretes fine filaments from two glands on its head. The filaments are made of a protein that hardens to form silk fibres when exposed to air. The silkworm deposits filaments in layers around its body, through figure-of-eight movements of the head, forming a structure called the cocoon

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Answer 2

Answer:

The life cycle of silkworm is as follows:

Explanation:

1. Egg Clusters:

• The female silk moth lays 300-400 eggs in clusters on mulberry leaves. At a suitable

temperature eggs will hatch into larvae.

2. Silkworm:

• Larva/Silkworm/Caterpillar will feed on mulberry leaves day and night and within

35 days it will become 10,000 times heavier than when they were hatched. It

sheds its moult (skin) four times. When it stops eating, it attaches itself to a straw

or branches of the mulberry tree to spin a silk cocoon.

3. Pupa / Cocoon:

• The spinning of cocoon is one continuous filament fibre which consists of fibroin

protein. It also consists of a gum called sericin to cement the filaments together.

Silk solidifies when it comes in contact with air. Once the cocoon is completed, the

silkworm goes into a resting phase for two to three weeks.

4. Silk moth:

• The silkworm then metamorphoses into silk moth that emerges out from the

cocoon by secreting a fluid to dissolve silk and emerges out with ease