Question

1. What are the different sources of wool? K&U 6. Why is rayon called artificial silk? 7. What is sericulture? 2. Name 4 varieties of silk. А A 8. Why do workers of the silk industry suffer burns? A 3. Why do yaks have a thick coat of hair? 9. What are the main hazards of the wool industry? 4. What is shearing? How it is done? A A 5. Write 1 difference between carding and combing 10. Name the protein which is the chief component of wool fibres.​

Answer 1

Answer:

1. Wool comes from sheep, goat, yak and some other animals. These wool-yielding animals bear hair on their body.

2. Four types of natural silk produced around the world: Mulberry silk, Eri silk, Tasar silk and Muga silk.

3. They have a thich coat of hair as it acts like a jacket to them and is used to preserve heat. The layer of hair acts like a natural heat barrier and kepps the body warm.

4. Once a sheep develops a thick coat of hair, it is shaved off to obtain wool. The process of cutting off the woolen fleece of sheep with a thin layer of skin is called shearing. It is done by the machines which removes the hair.

5. In general, combed fibres are cleaner, finer, stronger and more lustrous than carded ones. Combed fibres are generally used for producing worsted threads. Carding is a technique whereby two hand or machine cards are used.

6. Rayon is a synthetic fiber or man-made fiber or artificial fiber as it is prepared from the natural raw material called cellulose.

7. Sericulture, or silk farming, is the cultivation of silkworms to produce silk.

8. The allergens from the silk worm excrete, silkworm cocoon, scales and the cuticles of the abdomen and wings of the silk moth are the main causative agents of the asthma and other respiratory problems.

9. Some of the health hazards faced by wool industry workers are:

Respiratory diseases like asthma, bronchitis etc., are very common among these workers.

The workers suffer from various skin infections.

Other health problems include headache, fever, back pain, neck pain etc.

10. Keratin is a fibrous structural protein. It is key structure for making hairs,claws,hooves etc. and most important in human skin.

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