The caterpillar secretes fibre which hardens on exposure to air and becomes silk fibre. The fibre secrets by caterpillar are made from:

Q. Fill in the blanks:
1. Silk threads are made from a sticky secretion secreted by the ............................... of the silkworms.
2. The finest wool is obtained from ............................... silk moth.
3. The most common silk moth is ............................... silk moth.
4. The cocoons are put in ............................... to loosen the silk fibre.
5. ............................... and ............................... are animal fibres.

Q. Caterpillar completely covers itself by silk fibres. This covering is known as:

Q.

In the life cycle of the silk moth,the caterpillar covers itself completely with silk fibre .This covering is known as __.

Q. The secretion of the sting of silk worm forms the silk fibre.