Question

Silkworms secrete fibre made of
(a) fat
(b) cellulose
(c) protein
(d) nylon


NCERT Class VIII
Science - Exemplar Problems

Chapter 3. Fibre and Fabric

Answer 1

The correct answer is option (c) protein.

• Silkworm is a silkworm moth. It is an economically important insect, as it produces silk. The favorite foods of silkworms are white mulberry leaves, although they can eat other types of mulberry and even orange osage. Domestic silk moths rely entirely on humans for reproduction, thanks to thousands of years of special breeding. Wild moths (other species of Bombyx) cannot trade in the same way in silk production.
• Sericulture, the practice of producing silkworms to produce raw silk, has been active in China for at least 5,000 years, where it spread to India, Korea, Nepal, Japan, and the West. The domestic silk moth was bred with the wild Bombyx Mandarina, which stretches from northern India to northern China, Korea, Japan, and the far east of Russia. Domestic silk moth comes from China rather than Japanese or Korean stock.

Answer 2

Answer:

(c) protein

Explanation:

There are two types of fibre-

(1) natural fibre

(2) Artificial or man-made fibre

Natural fibre- the fibre which is obtains from plants and animal is called natural fibre.

e.g. cotton, silk, jute etc.

Artificial or man-made fibre- The fibre which is obtains from syntheis process is called artificial or man-made fibre.

e.g. nylon, royan, polyster etc.

Silkworm secrete fibre which is made up of protein.

Silk is natural fibre that is obtain form silkworm.

The history of silk-making is from thousands of years. It is called that ,the art of silk production was first discovered in ancient China.Because their is a lot of silkword produce as a agriculture propuse.  Today, the silk production process remains mostly the same as it was millennia ago. Silk is made from cocoons that are spun by silkworms.

The process of making silk from silkworm is known as sericulture.

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