Advertisements
Advertisements
Question
Describe the life history of the silk moth with the help of figures of various stages.
Advertisements
Solution
The female silk moth lays eggs. When an egg hatches, a tiny caterpillar crawls out. This is the silkworm or larva. The silkworm feeds on mulberry leaves and grows. When it is ready to enter the next stage in its life cycle, it first weaves a net to hold itself. It then secretes a fibre made of proteins, which hardens on exposure to air. This is the silk fibre. It covers itself completely with this fibre, to form a cocoon. At this stage, the larva is called a pupa. The pupa grows and changes inside the cocoon. A few weeks later, the cocoon opens and an adult moth comes out.
APPEARS IN
RELATED QUESTIONS
The silkworm is (a) a caterpillar, (b) a larva. Choose the correct option
Match the words of Column I with those given in Column II:
| Column I | Column II |
| Scouring | Yields silk fibres |
| Mulberry leaves | Wool yielding animal |
| Yak | Food of silk worm |
| Cocoon | Reeling |
| Cleaning sheared skin |
A natural fibre obtained by boiling cocoons is called ______.
HOTS
Silk fiber is used to manufacture parachute. Why?
State whether the following statement is True or False. If false, correct them.
Silkworms are caterpillars of silk moth.
State whether the following statement is True or False. If false, correct them.
The rearing of silkworms for obtaining silk is called silviculture.
Some words related to silk are jumbled up. Write them in their correct form.
TURECULRISE
Steps for the production of silk are given below in a jumbled order. Arrange them in their proper sequence.
- Eggs are warmed to a suitable temperature for the larvae to hatch from eggs.
- Fibres are taken out from the cocoon.
- After 25 to 30 days, the caterpillars stop eating and start spinning cocoons.
- The larvae/caterpillars or silkworms are kept in clean trays along with freshly chopped mulberry leaves.
- Female silk moths lay eggs.
- Cocoons are kept under the sun or boiled in water.
The production of silk is called ______.
The larva of a silkworm is called ______.
