Selective breeding is a process of (a) selecting the offsprings with desired properties. What are the common health problems found in the people who work in silk industry? A material which is composed of thin and continuous strands is known as fiber. Lohi, Rampur bushair, Nali, Bakharwal, Marwari and Patanwadi . The silk yarn (thread) is obtained from the cocoon of the silk moth. Silk is a fiber that comes from nature. Yarn is a long continuous thread that is made up of fibre. The farmer needs to take good care of these delicate larvae and feed them mulberry leaves. You also learnt that wool and silk fibres are obtained from animals. Your email address will not be published. 30 seconds . Silk is a natural protein fibre which can be used as a textile fibre. Name some Indian breed of sheep. 4. iv. They grow up in size and before they enter in the second stage which is called as pupa the caterpillar swings their head from sides and makes the shape of eight every time. Question 8. ... Ans. Answer: a) Yarn is made from fibres. Plastics are non-biodegradable. The harvester keeps these eggs at a warm temperature of 75 to 85 degrees Fahrenheit up to fourteen days. Answer. f) Silk fibre is obtained from the stem of a plant g) Polyester is a natural fibre. Answer. 4. This covering is known as the cocoon. Removal of the sericin coating before use removes the thrombogenic and inflammatory response of silk fibroin [217]. China is the largest silk producer and consumer in the world followed by India where Indian sarees made from silk are famous. Silkworms … Silk, animal fibre produced by certain insects and arachnids as building material for cocoons and webs, some of which can be used to make fine fabrics. 5. This covering is known as cocoon . K. Murugesh Babu, in Silk (Second Edition), 2019. Answer: The fibres obtained from plants and animals are called natural fibres. Explain. Hemp: Hemp fibres are obtained from the stem of the hemp plant. The fibres are first drawn out from their source and then twisted into yarn. Adult is not allowed to come out of the cocoon. Silk fibre is obtained from? 2. Spinning synthetic spider-silk fiber by using a much simpler spinning process. One of the common types is the mulberry silkmoth. The most popular form of silk is obtained from the cocoons of mulberry silkworm Bombyx mori. Some fibres such as cotton, jute, silk and wool obtained from plants and animals are called natural fibres. Why? Acrylic fibres bums with a sooty flame and shrinks to form black beads. Silk fibers are produced on demand from special silk glands of several groups of invertebrate animals such as silk moths. Make now. Two devices used in spinning are takli and charkha. How is Silk Obtained? The soft looking silk yarn is as strong as a comparable thread of steel. Silk fibres can be incorporated as reinforcements into thermoplastic matrices to create composite materials with a high strain to failure rate. Angora. (False) c) Jute is the outer covering of coconut. are solved by group of students and teacher of Class 7, which is also the largest student community of Class 7. iii. During the Indus valley civilization, its uses were noticed. Silk fiber is obtained from the stem of a plant. Silk fibres are converted into silk yarn which is used for making silk cloth. Examples of natural fibers are cotton and silk whereas examples of synthetic fibers are: nylon, polyester, etc. Silk fibres are used for weaving silk cloth. The caterpillar secretes fibre made of a protein, soon the caterpillar completely covers itself by silk fibres and turns into pupa. See more. Silk fibre is obtained from the silk cocoon and not from the adult. See more. 4. Silk fibers are produced on demand from special silk glands of several groups of invertebrate animals such as silk moths. (False) c) Jute is the outer covering of coconut. Silk fibre is obtained at which of the following stage of its life cycle? Plastics are non-biodegradable. B. cotton ball. The silk yarn (thread) is obtained from the cocoon of the silk moth. Ask your question. Silk fibres come from cocoons of the silk moth. B) Carbon compounds. Acrylic fibres bums with a sooty flame and shrinks to form black beads. Q. mention any two. This fibre is obtained from the silk cotton tree, also called kapok. A. Knighting. C. Cocoon is a protective case of silk or similar fibrous material spun by the larvae of moths and certain other insects as a cover for the pupa. When the fruit ripens, it bursts open, releasing the fibres. Silk Pillowcases Are Best Pillowcase for Women, What Is Silk Satin Fabric and Its Advantages Over Synthetics, How To Prevent Silk Sheets From Slipping Off The Bed, Improve Your Skin and Hair With Silk Sheets & Silk Pillowcases, Which Countries Are The Main Producers Of Silk, Prevent Wrinkles And Frizzy Hair With Silk Pillowcases, Features & Reeling Technology of Dupioni Silk Yarns. (b) selecting the parents with desired properties. Answer. Question 8. Silk: cotton Silk cotton is another plant fibre that is commonly used as a stuffing in pillow, sleeping bag, and life jacket. The silk yarn (thread) is obtained from the cocoon of the silk moth. Soon the caterpillar completely covers itself by silk fibres and turns into pupa. The cocoon is made of a thread of raw silk from 3 0 0 to about 9 0 0 m (1, 0 0 0 t o 3, 0 0 0 f t) long. Q10. This page shows answers to the clue Silk, followed by ten definitions like “A fiber obtained from silkworm cocoons”, “A natural fibre, processed to make an absorbent fabric” and “Postcards where silk fabric is applied to the design”. Silk is a resource under the generic Fiber type of resources. However, only silk from the silkworms is used for textile purposes. Silkworm. The shimmering appearance of silk is due to the triangular prism-like structure of the silk fibre, which allows silk cloth to refract incoming light at different angles, thus producing different colors. False. Answer. The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. What are the common health problems found in the people who work in silk industry? SURVEY . It’s wool is soft, and very warm. 1 decade ago. It is taken from the cocoons of silkworms. Silk fibre is obtained from cocoons of the silk moth. Silk fibres come from cocoons of the silk moth. Removal of the sericin coating before use removes the thrombogenic and inflammatory response of silk fibroin [217] . Name two items that are made from coconut fibre. Silkworm is … View more. Ungraded . The fruits of the kapok tree contain fibres that are light and fluffy (like cotton). Commercial silk is obtained from the cocoons spun by certain caterpillars (larvae of moths and butterflies) before pupation. At that time it was only used by the emperors and it was kept secret for hundreds of years. Prepared by: M. S. KumarSwamy, TGT(Maths) Page - 38 - WOOL There are many animals that bear a thick coat of hair on their body. Report an issue . (False) d) The process of removing seed from cotton is called ginning. Wool is obtained from the fleece (hair) of sheep or yak. The cocoon is made of a thread of raw silk from 300to about 900m(1,000to3,000ft)long. Answer. Display: List / Grid. All the non-generic resources of this type are: Bamboo Cotton Hemp Jute Seaweed Silk Straw The various resources within this type are interchangeable for crafting common items. Q12. Answer. A fiber can be of two types: natural fiber and synthetic fiber. Finally, you can weave the silk fibers obtained into clothes. BioSteel was a trademark name for a high-strength fiber-based material made of the recombinant spider silk-like protein extracted from the milk of transgenic goats, made by Montreal-based company Nexia Biotechnologies, and later by the Randy Lewis lab of the University of Wyoming and Utah State University. (a) Nylon (b) Cotton (c) Silk (d) Wool (b) Cotton. The further development of the pupa into moth continues inside the cocoon (Fig. Can you explain this answer? mention any two. The silkmoth further develops in the covering called a cocoon. Silk moths are native to South and Southeast Asia as well as Northern China (e.g., Antheraea pernyi). Silkworms are not actually born as worms rather as larvae and caterpillar hatched from the eggs of silkmoth. , carpets, nets, clothes, and fleas Class VI you have learnt some... From their source and then twisted into yarn route ’ EduRev Class 7, which of the silk )! 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