NCERT Class VII Science Solution: Chapter 3-Fibre to Fabric Part 2

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Question 3:

Which of the following does not yield wool?

  1. Yak

  2. Camel

  3. Goat

  4. Woolly dog

Answer:

Wool is the fiber derived from the specialized skin cells, called follicles, of animals in the sheep.

The hair of certain species of other mammals such as goats, llamas, and rabbits may also be called wool.

Woolly dog does not yield wool.

Question 4:

What is meant by the following terms?

  • Rearing

  • Shearing

  • Sericulture

Answer:

  • Rearing: It is raising and taking care of livestock (e.g. cows, buffaloes, goats etc.); for commercial purposes. These animals are fed, provided shelters and are bred for better yield like milk, meat, wool etc. For example, Sheep are reared mainly for the wool. They are mainly reared in areas with low rainfall. Reared sheep eat grass and leaves. They are also fed on a mixture of pulses, corn, jowar, oil cakes and minerals. In winters they are kept indoors and fed on dry fodder, leaves and grains.

This image shows rearing goats

Rearing Goats

  • Shearing: 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 similar to those used by barbers to remove hairs.

As showing in images is a result for shearing animals

Result for Shearing Animals

  • Sericulture: The breeding and management of silk worms for the production of silk is known as sericulture. Different types of silk (e.g. mulberry silk, Tassar silk etc.) with different textures are obtained from different varieties of silk moths.

As showing in images is a result for mulberry silk

Result for Mulberry Silk