Silkworm cocoons are natural polymer fibre composites made from silk fibres and sericin binder. Customize assignments and download PDF’s. Silk (disambiguation) Reeling of silk is (a) a process of making silk reels. (c) weaving of silk cloth. (b) rearing of silkworm. (b) rearing of silkworm. Fat and cellulose are not present in silk. (a) _____ and _____ fibres are obtained from animals. 8788563422. Fig. 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. Fill in the blanks in the following statements. secrete fibres made of protein (fibrin) with their special silk glands. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon Answer: (c) Silk protein consists of sericin and fibroin mainly. Generally, one cocoon produces between 1,000 and 2,000 feet of silk filament, made essentially of two elements. 3 Silkworm Genetics and Cloning. After this, the caterpillar completely covers itself by the fibre and turns into pupa. The fibres are very fine and lustrous, about 1 0 μ m (0. Cocoon: This is the pupa stage where the silkworm completes the formation of cocoon in a week under ideal conditions. (a) _____ and _____ fibres are obtained from animals. silk fibers, mulberry silk is more luxurious and breathable. Although they have silk filaments, these cannot be reeled because they are cut or pierced from one side. The protein fibre of silk is composed mainly of fibroin and produced by certain insect larvae to form cocoons. Silk yarns come from the cocoon of the silkworm. Question 11. These mach Silkworm secrete fibre made up of: View solution. 3. Silk fibers are then converted into silk threads to make different kinds of silk fabrics like silk sarees, etc. 13 min. Then, it swings its head from side to side. (c) making silk fabric from silk yarn. (c) making silk fabric from silk yarn. Jute fibre is obtained from the stem of the jute plant. Very Short Answer Questions 11. Silkworms secrete silk fibres, which are harvested and used to manufacture silk fabric. 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). The silkworm pupates in a protective cocoon which it spins from silk secreted from its salivary glands. ; 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. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon. (d) production of sarees. It secretes a protein fibre by swinging its head either side, which solidifies on exposure to air and becomes silk fibre. Silkworm is an insect that makes silk. 10.Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon Soln: Answer is (c) protein . Cellulose. LOJAS AS MELHORES LOJAS PRA VOCÊ E SUA FAMÍLIA. Answer: B. Weaving of silk cloth. The cocoon's silk is colourless and it is easily cleared of minerals, making them an ideal material for winding into a thread. silk fibres and turns into pupa. Class 7 Science Chapter 3 MCQ (Multiple Choice Questions) of Fibre to Fabric. by the weavers. Protein. Reeling of silk is (a) a process of making silk reels. For any content/service related issues please contact on this number . Once a sheep develops a thick coat of hair, it is shaved off to obtain wool. x. Yarn is made from fibre. (b) spinning of silk fibres. The insect's intent is to create a cocoon for its transformation into the moth form. Answer (b) Question 9. (d) production of sarees. View solution. The silk thread is obtained from the cocoons of silk moth. (b) spinning of silk fibres. This covering is known as the cocoon. View solution ) protein ( spider silk ), which solidifies on exposure air! 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