Nylon is a synthetic fibre. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon Answer: (c) Silk protein consists of sericin and fibroin mainly. The most commonly used silk is mulberry silk as silk moth feed on mulberry leaves. Soon, the caterpillar covers itself with silk and forms a cocoon. Weaving of silk cloth. (b) rearing of silkworm. 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. 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. Very Short Answer Type Questions. (d) production of sarees. Silkworms are fed on mulberry leaves. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon. Silkworm workers simply unravel the cocoons, each cocoon producing between 325–1,000 feet (100–300 meters) of fine, very strong thread. Create custom Assignments. Mon to Sat - 10 AM to 7 PM (c) weaving of silk cloth. Question 9: Reeling of silk is. 10. Answer (b) Question 9. In pupa stage silk is obtained. Once a sheep develops a thick coat of hair, it is shaved off to obtain wool. ; The silkworm secrete a certain type of fibre which is used for making silk ; Silworm secretions are very fine as it consists of traces of Keratin and other proteinaceous substances. Female silk moth lays eggs and then the larvae are hatched out of eggs known as caterpillars. Fill in the blanks in the following statements. 3. This is the silk fibre. Sem categoria Silkworms secrete silk fibres, which are harvested and used to manufacture silk fabric. (d) the process of taking silk threads from cocoon. x. Yarn is made from fibre. The GM silkworms secrete fibres made of spider web protein (spider silk), which is stronger than normal silk fibre protein. Reeling of silk is (a) a process of making silk reels. (b) spinning of silk fibres. Class 7 Science Chapter 3 MCQ (Multiple Choice Questions) of Fibre to Fabric. Silk fibres are drawn from the cocoon of the silkworm. Rearing of silkworm. (c) weaving of silk cloth. (a) _____ and _____ fibres are obtained from animals. 8788563422. Cellulose. silkworms secrete fibre made of answer. Silk is the first artificial fibre synthesized by human beings. Also know, which stage of silkworm produces silk? Answer: D. Question 10: Silkworms secrete fibre made of. Very Short Answer Type Questions. (a) _____ and _____ fibres are obtained from animals. The insect's intent is to create a cocoon for its transformation into the moth form. 10.Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon Soln: Answer is (c) protein . For any content/service related issues please contact on this number . S. Winkler, D.L. Silkworm is an insect that makes silk. (d) production of sarees. Explanation: A salivary gland of silkworm releases a protein which is used as silk. Fat and cellulose are not present in silk. Scientists have produced genetically modified (GM) silkworms that contain a gene from a spider. NCERT Exemplar for Class 7 Science Chapter 3 Fibre to fabric Explanation: Salivary gland of silkworm releases a protein which is used as silk. 11. 8788563422. (b) spinning of silk fibres. The process of taking out threads from the cocoon for use as silk is called _____ the silk. a natural protein fibre, some forms of which can be woven into textiles. Silk is a natural protein fibre which can be woven into textiles. (c) making silk fabric from silk yarn. (d) the process of taking silk threads from cocoon. The fibres which are obtained from natural sources like plants and animals are called natural fibres.The fibres which are prepared from chemical substances in … 6. Fig. (d) production of sarees. The natural colour of wool is generally creamy white though some breeds of sheep produce wool having brown and black colours. For any content/service related issues please contact on this number . Question 11: Fill in the blanks in … 9. Silk (disambiguation) (c) making silk fabric from silk yarn. (c) making silk fabric from silk yarn. This silk covering in which a silkworm covers itself is known as a cocoon. View solution. You are very important to us. 13 min. The fiber, called fibroin, makes up between 75 and 90%, and sericin, the gum secreted by the caterpillar to glue the fiber into a cocoon, comprises about 10-25% of silk… (f) Silk fiber is obtained from the stem of a plant. (d) production of sarees. The silkworm pupates in a protective cocoon which it spins from silk secreted from its salivary glands. December 9, 2020; Uncategorized; 0 Comments … After this, the caterpillar completely covers itself by the fibre and turns into pupa. Silk yarns come from the cocoon of the silkworm. Then, it swings its head from side to side. Very Short Answer Questions. Silkworm cocoons are natural polymer fibre composites made from silk fibres and sericin binder. Silk fibers are then converted into silk threads to make different kinds of silk fabrics like silk sarees, etc. Silkworm secrete fibre made up of: View solution. Ans. Silkis a fine, strong, soft and shining fibre produced by silkworms in making their cocoons. Also, the protein fibre of silk is made up of fibroin and is produced from silkworm's larvae to form cocoons. Fat. (b) rearing of silkworm. Very Short Answer Type Questions. The protein fibre of silk is composed mainly of fibroin and produced by certain insect larvae to form cocoons. (c) weaving of silk cloth. (b) rearing of silkworm. Fill in the blanks in the following statements. (c) weaving of silk cloth. Making silk fabric from silk yarn. You are very important to us. These mach The fibres are very fine and lustrous, about 1 0 μ m (0. (d) the process of taking silk threads from cocoon. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon Answer: (c) Silk protein consists of sericin and fibroin mainly. Reeling of silk is (a) a process of making silk reels. silk fibers, mulberry silk is more luxurious and breathable. Nylon. (b) spinning of silk fibres. Let us find out the method how Silkworm produces silk, silk is made up of what, types of silk varieties etc. SEGMENTO. LOJAS AS MELHORES LOJAS PRA VOCÊ E SUA FAMÍLIA. 10. Question 11. (b) rearing of silkworm. (c) making silk fabric from silk yarn. Protein. During these movement of head, the silkworm secrets fibre made of protein which hardens on exposure to air and becomes silk fibre (or silk thread). Silk Shantung Fabric is a heavy fabric with a rough nubby surface, made of spun wild silk. (d) the process of taking silk threads from cocoon. Jute fibre is obtained from the stem of the jute plant. Although they have silk filaments, these cannot be reeled because they are cut or pierced from one side. A process of making silk reels. Mon to Sat - 10 AM to 7 PM The most common kind is called Mulberry Silkworm. Solution: (c) Salivary gland of the silkworm secretes fibre made up of protein sericin and fibroin. After the larva grows, it stops eating and weaves a net around itself. Answer: C The fibroin gene from the domesticated silkworm, B. mori, has been cloned into the bacterium, Escherichia coli, but the gene was unstable. Its scientific name is Bombyx Mori. silk fibres and turns into pupa. Describe the process of obtaining silk fibres from the cocoon. These silk fibres are obtained from cocoon stage. View solution. This covering is known as the cocoon. Although silkworm silk has been historically the most useful, spider silk may be the material of the future! Reeling of silk is (a) a process of making silk reels. Customize assignments and download PDF’s. During these movements, caterpillars secrete a fibre made of protein, which solidifies and hardens when exposed to air for some time. Cocoon: This is the pupa stage where the silkworm completes the formation of cocoon in a week under ideal conditions. Nylon is a synthetic fibre. View solution. Question 11: Fill in the blanks in … Production of sarees. plants and animals. x. Yarn is made from fibre. The fabric we call silk is made from the long thin fibers produced by the silkworm during its larval stage. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon. There is a chain of method in manufacturing Silk from Cocoons. It secretes a protein fibre by swinging its head either side, which solidifies on exposure to air and becomes silk fibre. Reeling of silk is (a) a process of making silk reels. Caterpillars continue to spin silk fibre till they completely get covered by these fibres. Spinning of silk fibres. The cocoon's silk is colourless and it is easily cleared of minerals, making them an ideal material for winding into a thread. Use the coupons before they're expired for the year 2020. by the weavers. The best-known type of silk is obtained from the cocoons of the... (44 of 6033 words, 18 images) en .wikipedia .org /wiki /Silk. Soln: The answer is (c) protein. Generally, one cocoon produces between 1,000 and 2,000 feet of silk filament, made essentially of two elements. Types of Fibres, Fibre to Fabric, Class 6. Make now. secrete fibres made of protein (fibrin) with their special silk glands. Chapter 3 - Fibre to Fabric. The silk thread is obtained from the cocoons of silk moth. The silkmoth further develops in … Answer: B. 3 Silkworm Genetics and Cloning. This silk is soft and warm and is popular as shawls and quilts. The protein fibre secreted by silkworm gets hardened on exposure to the atmosphere and becomes silk fibre. Kaplan, in Encyclopedia of Materials: Science and Technology, 2001. Very Short Answer Questions 11. The process of taking silk threads from cocoon. explain the process of obtaining silk fibre from cocoon. Spiders. During all these times they secrete fibre made up of protein which when comes in contact of air and it hardens to become a silk fibre. Silkworm fibroin from B. mori consists of two major structural proteins, 325 kDa for the heavy chain, and 25 kDa for the light chain. Fat and cellulose are not present in silk. View more. Which product of caterpillar forms silk? Grab the latest working Silkworm coupons, discount codes and promos. (b) spinning of silk fibres. Answer (d) Question 10. Silkworm gets hardened on exposure to air for some time itself with silkworm secrete fibre made of and forms cocoon! Of taking out threads from the cocoon salivary gland of silkworm produces silk use the coupons they! 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