Chemistry
Grade-7
Easy

Question

Match the following.

  1. a-iv, b-ii, c-iii, d-i 
  2. a-iii, b-iv, c-i, d-ii
  3. a-i, b-ii, c-iii, d-iv
  4. a-iv, b-ii, c-i, d-iii

hintHint:

1) silk comes from insects.
2) cotton fibers can be made up of a variety of fabrics ranging from lightweight voiles and laces to heavy sailcloths and thick-piled velveteens, suitable for a great variety of wearing apparel, home furnishings, and industrial uses.
3) wool is natural and obtained from an animal.
4) Strongest fiber

The correct answer is: a-iv, b-ii, c-iii, d-i


    • Silk is a natural protein fiber, several forms of which can be woven into textiles. The protein fiber of silk is composed primarily of fibroin and is produced by the larvae of certain insects to form cocoons. . The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm.
    • Cotton is a soft, fluffy staple fiber that grows in capsules or pods around the seeds of the Gossypium cotton plant of the Malvaceae family. Fiber is almost pure cellulose.
    • wool is an animal fiber that forms the protective covering or fleece of hairy mammals such as sheep, goats, and camels.
    • Nylon is a family of materials called polyamides made from carbon-based chemicals found in coal and petroleum in a heated, high-pressure environment.

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