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