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.