How is it done? Cocoons are collected and kept under the sun, or boiled, or exposed to steam. Silk is formed in liquid form in the two glands in the silkworms’s head. 4. Answer– cotton plants, jute (b) Animals fibres are _____ and _____. (1) Rearing of Silkworms to Obtain Cocoons, (2) Processing of Cocoons to Obtain Silk Fibres, (3) Converting Silk Fibres into Silk Cloth. Mulberry silk is soft, lustrous (shiny) and elastic, and can be dyed in beautiful colours Thus. In order to produce silk, the silkworm developing inside the cocoon (as pupa) is not allowed to mature into an adult silk moth. What is the nature of silk fibre obtained from the cocoon of mulberry silk moth? The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori reared in captivity, This site is using cookies under cookie policy. Classify the following fibers as natural or synthetic: nylon, wool, cotton, silk, … This helps in separating out the silk fibres. Then it swings its head from side to side in the form of figure of eight. 3. polyster is a natural fibre please answer correct to be the brainilest if you will answer wrong god will punish you As soon as the cocoon is formed it is used to obtain silk. nylon, wool, cotton, silk, polyester, jute. This is because if the silkworm (as pupa) is allowed to mature into a silk moth, then the fully formed silk moth secretes a liquid to dissolve a part of silk of the cocoon to break it so as to come out of it and fly away. Silk fibre is made of a protein. The cocoons having developing silkworms inside them are used to obtain silk. Silk is a fine, strong, soft and shining fibre produced by silkworms in making their cocoons. Jute fibre is obtained from the stem of the jute plant. Question 5 What is a cocoon? It is the larva (or caterpillar) of a silk moth which produces silk and not the adult silk moth. Sericulture is a very old and common occupation in India, producing silk on a commercial basis. carefully on paper strips (or cloth strips) and sold to silkworm farmers. Question 7 Describe how silk is produced? (b) … 2. She has started this educational website with the mindset of spreading Free Education to everyone. The fibres are very fine and lustrous, about 10μm(0.0004in)in diameter. Hence, they are natural fibres. Nylon and polyester on the … The silkworm continues to develop in the form of pupa inside the cocoon to form the silk moth. 2. Classify the following fibres as natural or synthetic: nylon, wool, cotton, silk, … (Paper is also made of cellulose obtained from wood pulp). Silk is a natural fibre which is obtained from an insect (called silk moth). The silk moth passes through a worm-like stage called ‘larva’ or caterpillar’ (which is also called silkworm) and an encased form called pupa’ during its development between the hatching of egg and formation of adult silk moth. Reeling is done in special machines which unwind the fibres of silk from cocoons. What is pupa? Jute fibre is obtained from the stem of the jute plant. Answer: Wool can be obtained … In India, cotton is … Some of the silkworms (as pupae) are allowed to live and mature into silk moths so that they can lay eggs to produce more silkworms. Silk fibre is made of a protein. Question 6 Describe the life history of silk moth? 3. 2. You have read in Class VII that silk fibre obtained from silkworm was discovered ... Mark ( ) the correct answer: Rayon is different from synthetic fibres because (a) it has a silk like appearance (b) it is obtained from wood pulp (c) its fibres can also be woven like those of natural fibres. This breaking of cocoon causes damage to its silk threads and hence lowers the quality of silk. g) Polyester is a natural fibre. Question 9 Name the tree whose leaves provide food for the silkworms? 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