There are about 20 sets of MCQ tests, each test containing 5 questions with answers and explanation of answers updated for new academy session 2020-21. How is it done? C) Protein done clear. Natural silk is an animal fibre. How is Silk … Mulberry silk moth is the most common type, and the fibre obtained from it is lustrous, soft, elastic, and can be dyed with different colours. Explanation: a)& b) Process of making yarn from fibres is called spinning. Nylon and polyester on the … Wool fibre cannot be obtained from which of the following? Fill in the blanks: (a) Plant fibres are obtained from____________ and___________ . Question 17. The silkworm continues to develop in the form of pupa inside the cocoon to form the silk moth. The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. 2.jute is the outer covering of coconut. Animal fibre: Silk and wool are animal fibre. What is the nature of silk fibre obtained from the cocoon of mulberry silk moth? Answer: It is soft, lustrous and elastic. Hot water makes the silk fibres of cocoons to separate out. (a) Goat (b) Llama (c) Alpaca (d) Moth . Silk fibre is made of a protein. When the eggs hatch, silkworms come out of the eggs. Classify the following fibres as natural or synthetic: nylon, wool, cotton, silk, … no it is not correct silk is obtained from cocoons FALSE, The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. g) Polyester is a natural fibre. During these movements of head, the silkworm secretes silk in liquid form through the tiny opening in its head which solidifies on exposure to air and becomes a silk fibre (or silk thread). (1) Rearing of Silkworms to Obtain Cocoons, (2) Processing of Cocoons to Obtain Silk Fibres, (3) Converting Silk Fibres into Silk Cloth. Artificial silk (called rayon) is obtained from wood pulp and it is made of modified plant material ‘cellulose. Egg——> Larva(caterpillar) ——> Pupa ——> Silk moth. carefully on paper strips (or cloth strips) and sold to silkworm farmers. The most common silk moth is the mulberry silk moth. Silkis a fine, strong, soft and shining fibre produced by silkworms in making their cocoons. Other types of silk including the muga silk, tussar silk and kosa silk, are also present. Answer-wool, silk. Silk fibre is obtained from (a) fleece of sheep (b) cotton ball (c) cocoon (d) shiny jute stalk . The fibers which are obtained from plants and animals are known as natural fibers whereas synthetic fibers are man-made fibers. The eggs are then warmed to a suitable temperature for hatching. Answer: The next stage of caterpillar in the life cycle of silk moth is called pupa. Natural silk is obtained from the cocoons of silkworms and it is made of a ‘protein’. Cocoons are collected and kept under the sun, or boiled, or exposed to steam. The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori reared in captivity _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Hope it helps you ✌ Cotton . big in size. Your email address will not be published. Fill in the blanks with appropriate words: (a) … Wiki User Answered . Answer– True (d) Silk fibre is obtained from the stem of a plant. View Answer. Question 8: Name wool-yielding animals other than sheep. (Paper is also made of cellulose obtained from wood pulp). From which parts of the plant cotton and … As soon as the cocoon is formed it is used to obtain silk. The silkworms are fed mulberry leaves. Examples of natural fibers are cotton and silk whereas examples of synthetic fi… Q34: Name the source of natural fibre “cotton”. 3. The silkworms feed on the leaves of mulberry tree and grow bigger in size. Silk fibres are converted into silk yarn which is used for making silk cloth. f) Silk fibre is obtained from the stem of the plant. (Paper is also made of cellulose obtained from wood pulp). Mulberry silk is soft, lustrous (shiny) and elastic, and can be dyed in beautiful colours Thus. (3) When the silkworm (or caterpillar) is ready to enter the next stage of its development called pupa, it first weaves a net to hold itself. The larva (or caterpillar) and pupa stages in the life history of a silk moth are totally different in appearance from the adult silk moth. 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. The silk obtained from the cocoons of mulberry silk moth is called mulberry silk. the most common variety of silk is mulberry silk. Silk fibre made of How silk is made from silkworm yak How does sericulture done what isrearing 1.What changes take place in the Pupa stage of silkworm? This breaking of cocoon causes damage to its silk threads and hence lowers the quality of silk. The cocoons having developing silkworms inside them are used to obtain silk. (1) The female silk moth lays eggs on the leaves of a tree (such as mulberry tree). Silk fibres are converted into silk yarn which is used f… Answer-False Q3. c) We get jute fibres from the outer layer of a stem of the jute plant. Question 6 Explain the process of making yarn from fibre. Silk is a natural fibre which is obtained from an insect (called silk moth). 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. ) Goat ( b ) process of making yarn from fibres is called silkworm Answer– True d! 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