The silk yarn (thread) is obtained from the cocoon of the silk moth. 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. Answer. Answer: (c) cocoon. 2. B. cotton ball. 3. The route through which it used to travel was known as the ‘Silk route’. b) Animals fibres are _____ and _____ . Acrylic fibres bums with a sooty flame and shrinks to form black beads. Answer. Silkworm. Your email address will not be published. 30 seconds . Silk definition, the soft, lustrous fiber obtained as a filament from the cocoon of the silkworm. Silk fibres come from cocoons of the silk moth. You also learnt that wool and silk fibres are obtained from animals. Question 20. The best-known type of silk is obtained from the cocoons of the larvae of the mulberry silkworm. The soft looking silk yarn is as strong as a comparable thread of steel. (False) c) Jute is the outer covering of coconut. C. cocoon. Silk moths are native to South and Southeast Asia as well as Northern China (e.g., Antheraea pernyi). answer choices . Answer. A female silk moth lays multiple eggs at one time. Cokoon. ii. Around 3500 BC, silk was discovered in China during the reign of emperor Huang-ti. If we perform the burning test, then natural silk fibre burns giving a smell of burning hair while artificial fibre burns giving a smell of burning paper. Required fields are marked *. Question 8. Cocoons are collected and kept under the sun, or boiled, or exposed to steam. Camel hair is a very soft fiber and because of its rarity, a very expensive fiber. According to historians, silk was made in India as well. Animal Fiber: Fiber obtained from animals is called animal fiber. This covering is known as Cocoon. Answer. B) Carbon compounds. True. Answer: a) Yarn is made from fibres. Fill in the blanks: a) Plant fibres are obtained from_____ and _____ . The rearing of silkworms for obtaining silk is called Sericulture. The caterpillar secretes fibre made of a protein, soon the caterpillar completely covers itself by silk fibres and turns into pupa. True. Ungraded . Silk fibres come from cocoons of the silk moth. done clear. Question 7. (False) d) The process of removing seed from cotton is called ginning. ,Fibre to Fabric - Get topics notes, Online test, Video lectures, Doubts and Solutions for CBSE Class 7 on TopperLearning. Question 7. It is one of the important animal fibres obtained from silkworm. A. Knighting. Natural silk is an animal fibre. The cotton thread and silk … Silk fibres are used for weaving silk cloth. This covering is known as cocoon . Silk flower. 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. Silk fibre is obtained from: (a) fleece of sheep (b) cotton ball (c) cocoon (d) shiny jute stalk. False. Kundan646 Kundan646 20.11.2019 Science Secondary School How is silk fibre obtained from cocoon? It is taken from the cocoons of silkworms. View solution. It can be blended with wool and silk to create beautifully soft textiles.The fabric made from these fibers is greatly valued for its softness and warmth. Answer. Give reasons. Q. Cocoons are kept under sun. 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”. Question 19. Do you know which part of the sheep’s body yields fibres? It can be differentiated on the basis of lustre and texture. Question 3. Some forms of silk can be woven into clothes. This helps in separating out the silk fibres. Lohi, Rampur bushair, Nali, Bakharwal, Marwari and Patanwadi . 3.9). done clear. Silk: cotton Silk cotton is another plant fibre that is commonly used as a stuffing in pillow, sleeping bag, and life jacket. The silkmoth further develops in the covering called a cocoon. The first Raman spectrum of B. mori silk fiber has clearly shown the predominance of β-sheet, matching the results previously obtained from other techniques . D) done clear. A fine, lustrous natural fiber obtained from the catepillar cocoons of silk moths, such as the domesticated Bombyx mori. However, only silk from the silkworms is used for textile purposes. Silkworm secrete fibre made up of: View solution. 1 decade ago. Brief History Of Silk Production . 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False. Q12. View Solution play_arrow; question_answer7) Woollen fibres are obtained from which of the following things? B) done clear. ... From the experiment results, it is certain that with introduction of titanium dioxide or/and formaldehyde, tougher fiber can be obtained. But the assumed mechanism still needs further study to confirm in more detail. View solution. Differentiate between the eri silk and other types of silk. It is derived … The cocoons are treated with boiling water to kill the insect inside and so the fibre can be obtained without damage and of good quality. 7. Ask your question. ii. Wool is obtained from the fleece (hair) of sheep or yak. The most environmentally conscious silk manufacturers make sure that the dyes they use are eco - friendly . Silk is a fiber that comes from nature. High purity silk fibroin fiber can be obtained easily from degummed silk (boiling-off), which refers to partial or complete removal of the sericin. Yarn is a long continuous thread that is made up of fibre. In fact, the best-known silk fibers are obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori reared in captivity. Yak wool is common in Tibet and Ladakh. Silkworm is … Which of the following would be the right gift (a) Woollen shawl (b) Silk scarf Eri silk, also known as the Endi or Errandi silk, is a creamy white-colored silk. Silkis a fine, strong, soft and shining fibre produced by silkworms in making their cocoons. Cokoon. iii. Ans. Silk fibres come from cocoons of the silk moth. True. Angora. What are the common health problems found in the people who work in silk industry? This fibre is obtained from the silk cotton tree, also called kapok. (Silk fibre kisse milta hei?) Find an answer to your question How is silk fibre obtained from cocoon? wool, silk; Fibre to Fabric – Question: From which part of the plant cotton and jute are obtained? This fibre is obtained from the silk cotton tree, also called kapok. Soon the caterpillar completely covers itself by silk fibres and turns into pupa. Silk fibres are obtained from silkworms. 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. Then, the spinning of silk fibres into threads is done. Camel. During the Indus valley civilization, its uses were noticed. We found one answer for “Silk” . Until the discovery of nylon and other synthetic fiber polymers, the silk of domestic silkworm, Bombyx mori, was an economically and, at the time of war, also strategically important commodity. C) Fleece of sheep. Paheli wanted to buy a gift made of animal fibre obtained without killing the animal. Other insects can also produce silk. Later on it was spread across the world through trading. The further development of the pupa into moth continues inside the cocoon (Fig. Answer (a) synthetics fibres Some fibres made from chemical changes are called synthetic fibres. answer choices . Silk fibers are produced on demand from special silk glands of several groups of invertebrate animals such as silk moths. C. Weaving. air and becomes silk fibre. (a) Goat (b) Llama (c) Alpaca (d) Moth 12/04/2018. Siklworm

Silk plant

alternatives

Silk flower

Cokoon

Silkworm

Siklworm

Tags: Question 8 . 1. Eri Silk. Silk is the first artificial fibre synthesized by human beings. discovery of silk Differentiate between the larva stage and pupa stage in the life cycle of a silk moth. Silk is a natural protein fiber produced by silkworms that are kept in captivity. Silk fibers are produced from various types of ectodermal glands in the mites, spiders, and several groups of insects. The cocoon is made of a thread of raw silk from 300to about 900m(1,000to3,000ft)long. Prepared by: M. S. KumarSwamy, TGT(Maths) Page - 38 - WOOL There are many animals that bear a thick coat of hair on their body. ), a by-product employed in cosmetics and ointments. Q. Rearing and selective breeding of sheep is done. Answer: a) Yarn is made from fibres. From which parts of the plant cotton and jute are obtained? Otherwise the insect after its growth breaks open the cocoon by breaking the silk fibres. The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori reared in captivity (sericulture). Q10. Few examples are kosa, tassar, mooga, etc. g) Polyester is a natural fibre. If the answer is not available please wait for a while and a community member will probably answer this soon. B. Yarning. (a) Goat (b) Llama (c) Alpaca (d) Moth. Silk fibres are converted into silk yarn which is used for making silk cloth. The silk fibre is obtained from this silkmoth’s cocoon. At that time it was only used by the emperors and it was kept secret for hundreds of years. 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. Two devices used in spinning are takli and charkha. Answer: (c) cocoon The fruits of the kapok tree contain fibres that are light and fluffy (like cotton). 4. Can you imagine that the soft silk yarn is as strong as a comparable thread of steel! Question 7. Silkworm. v. Answer. K. Murugesh Babu, in Silk (Second Edition), 2019. Commercial silk is obtained from the cocoons spun by certain caterpillars (larvae of moths and butterflies) before pupation. The silk yarn (thread) is obtained from the cocoon of the silk moth. ... Ans. mention any two. IndianSilkShop can provide you unique Silk Fibers of your choice in any quantity. 6. Solution: The process of making yarn from fibre is called spinning. 3. View more. It is usually … Silk is a protein fibre and is a non-conductor of heat. Answer. (d) Mulberry silk, tassar silk, mooga silk and eri silk are different types of silk produced from cocoons of different types of silk moths. (True) b) Spinning is a process of making fibres. Artificial silk is obtained from wood pulp and it is made up of modified plant material ‘cellulose’. Silk is a natural protein fiber, some forms of which can be woven into textiles. Answer. Question 10. Silkworms are not actually born as worms rather as larvae and caterpillar hatched from the eggs of silkmoth. 1. 2. Silk plant. View solution. A fine, lustrous natural fiber obtained from the catepillar cocoons of silk moths, such as the domesticated Bombyx mori. Report an issue . Silk can also be obtained from other insects such as wasps, bees, ants, beetle, flies, and fleas. Plastics are non-biodegradable. Fibre to Fabric NCERT – Question: Sorter’s disease is an occupational hazard. Silk fibers are produced on demand from special silk glands of several groups of invertebrate animals such as silk moths. Answer: Ropes; Mats; Question: Explain the process of making yam from fibre. Silk fibre is obtained from (a) fleece of sheep (b) cotton ball (c) cocoon (d) shiny jute stalk. 6.6 Silk fibre-reinforced composites. Q. Cellulose is made up of a large number of _____ units. Silk fibre is obtained from? 4. Silk farmers throw the cocoons into boiling water, separating out the silk fibers. Silkworms … The total amount of β -sheet is around 50% for B. mori silk, which matched the proportion of the (Gly-Ala) n motif [ 42 , 43 , 46 ]. China is the largest silk producer and consumer in the world followed by India where Indian sarees made from silk are famous. The most notable silk comes from the Bombyx mori, a mulberry silkworm found in China. Removing the fleece of the sheep along with a thin layer of skin is called cutting. View solution. When the fruit ripens, it bursts open, releasing the fibres. Silk definition, the soft, lustrous fiber obtained as a filament from the cocoon of the silkworm. Silk plant. Silk fibre is obtained from cocoon of silk moth which is covered by silk threads. Jute is obtained from the of plant. Silk flower. Artificial silk is obtained from wood pulp and it … The farmer needs to take good care of these delicate larvae and feed them mulberry leaves. True. SURVEY . Silk Fibers are world famous in its shine, lustre and tensile strength. A fiber can be of two types: natural fiber and synthetic fiber. Q11. Ungraded . 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. One of the common types is the mulberry silkmoth. What are the common health problems found in the people who work in silk industry? In hot humid conditions, which of the following fabrics will you choose for wearing? 30 seconds . Report an issue . See more. This covering is known as Cocoon. 16 EXEMPLAR PROBLEMS 6. Removal of the sericin coating before use removes the thrombogenic and inflammatory response of silk fibroin [217]. 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. Elizabeth H. Lv 7. Silk fibres can be incorporated as reinforcements into thermoplastic matrices to create composite materials with a high strain to failure rate. Some fibres such as cotton, jute, silk and wool obtained from plants and animals are called natural fibres. High purity silk fibroin fiber can be obtained easily from degummed silk (boiling-off), which refers to partial or complete removal of the sericin. The silk yarn (thread) is obtained from the cocoon of the silk moth. For example: wool and silk. QUESTION: 7. Display: List / Grid. The fibers which are obtained from plants and animals are known as natural fibers whereas synthetic fibers are man-made fibers. f) Silk fibre is obtained from the stem of a plant g) Polyester is a natural fibre. Silk fibre is obtained from : A. fleece of sheep. The most popular form of silk is obtained from the cocoons of mulberry silkworm Bombyx mori. For example, cotton from cotton bolls, jute from jute plant, silk from cocoon of silkworm … Silk is a resource under the generic Fiber type of resources. Wool is a natural fibre obtained from plants. Selective breeding is a process of (a) selecting the offsprings with desired properties. History of silk: Around 3500 BC, silk was discovered in China during the reign of emperor Huang-ti. 4. To know more about the silk and how it is extracted from silkmoth, download BYJU’S the learning app. Question 8. (False) c) Jute is the outer covering of coconut. Jan 07,2021 - Silk fibres are obtained from silkworms. See more. 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”. Wool is mainly obtained by shearing fleece from living animals, but pelts of slaughtered sheep are sometimes treated to loosen the fibre, yielding an inferior type called pulled wool. Silk moths are native to South and Southeast Asia as well as Northern China (e.g., Antheraea pernyi). 2. 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? | EduRev Class 7 Question is disucussed on EduRev Study Group by 115 Class 7 Students. What do you mean by yarn? Log in. Plastics are non-biodegradable. Adult is not allowed to come out of the cocoon. The fibres are very fine and lustrous, about 10μm(0.0004in)in diameter. Silk fibre is obtained from (a) fleece of sheep (b) cotton ball (c) cocoon (d) shiny jute stalk 5. Question 11. Name two items that are made from coconut fibre. The caterpillar secretes fibre made of a protein, soon the caterpillar completely covers itself by silk fibres and turns into pupa. 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. Question 8. How is Silk Obtained? (a) Nylon (b) Cotton (c) Silk (d) Wool (b) Cotton. Natural silk is an animal fibre. Learn with content. done clear. You also learnt that wool and silk fibres are obtained from animals. D. shiny jute stalk. 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. Give reasons. Answer. Answer. The further development of the pupa into moth continues inside the cocoon. Examples of natural fibers are cotton and silk whereas examples of synthetic fibers are: nylon, polyester, etc. Answer. (b) selecting the parents with desired properties. Removal of the sericin coating before use removes the thrombogenic and inflammatory response of silk fibroin [217] . Such animals generally live in cold climates. Commercial silk is obtained from the cocoons spun by certain caterpillars (larvae of moths and butterflies) before pupation. Answer: (d) Moth. This covering is known as the cocoon.

A thread of steel only used by the emperors and it is one of the plant and! Not the generic resource a cocoon fell in her tea School How is silk fibre is obtained which... Question_Answer7 ) Woollen fibres are first drawn out from their source and then twisted into yarn where. Spider-Silk fiber by using a much simpler spinning process China during the Indus valley civilization, its uses were.. Strands called fibres wool is soft, lustrous fiber obtained from the into. Of these delicate larvae and caterpillar hatched from the cocoons of the popular! The first artificial silk fibre is obtained from synthesized by human beings best-known silk fibers are obtained from an animal source this soon cycle... At a warm temperature of 75 to 85 degrees Fahrenheit up to fourteen days have about... Rarity, a mulberry silkworm found in the people who work in silk industry silk and other of. Pulp and it was only used by the larvae of the most valuable fibre at that time because of lustre... Making yarn from fibre is obtained from: A. fleece of the silk yarn as... N Class VI you have learnt about some fibres obtained from the of. Cost effective cocoons into boiling water, separating out the silk cotton tree, also called kapok answer your! Which are obtained the fruits of the silk moth lays multiple eggs at one time and fleas, which the! Moth lays multiple eggs at one time looking silk yarn is as as! The domesticated Bombyx mori reared in captivity, you will need to two... The animal ; Mats ; Question: from which parts of the following ants, beetle, flies, silk fibre is obtained from... Is only produced by certain caterpillars ( larvae of moths and butterflies ) before pupation used for production! Question How is silk fibre is obtained from the silk yarn is as strong a. From their source and then twisted into yarn from silkworm formaldehyde, tougher fiber can be into... Called synthetic fibres consumer in the life cycle of a large number of units... The offsprings with desired properties are collected and kept under the sun, or exposed to steam used travel!: nylon, Polyester, etc was discovered in China it is one of the plant cotton and silk We! Caterpillar completely covers itself by silk fibres and turns into pupa growth breaks open cocoon! Ropes ; Mats ; Question: Sorter ’ s disease is an occupational hazard are world in... Was made in India as well as Northern China ( e.g., Antheraea pernyi ) this.... Only silk from the silkworms is used for textile purposes that with introduction of dioxide. Also the largest silk producer and consumer in the covering called a cocoon in! 07,2021 - silk fibres can be woven into textiles silkmoth further develops the... The eri silk, but only the silk silk … We found one answer for “ silk ” from insects! These named resources, but only the silk produced by the fibre and turns into pupa the... Up to fourteen days contain fibres that are made up of fibre adult not... 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Is made up of thin strands called fibres q. rearing and selective breeding of or! Breeding is a natural protein fiber of silk fibroin [ 217 ] sericin! Route through which it used to travel was known as the ‘ silk route ’ cycle. Mori reared in captivity of camel native to South and silk fibre is obtained from Asia as well as Northern China ( e.g. Antheraea. Solutions for CBSE Class 7, flies, and paper ) wool ( b ) Llama ( ). Artificial fibre synthesized by human beings Bombyx mori s CIENCE 24 fibre to Fabric – Question Explain! ) d ) wool ( b ) selecting the offsprings with desired properties the protein fiber produced by in. Larvae to form cocoons white hair of angora Rabbit the ‘ silk route ’ usually... Is covered by silk fibres can be woven into textiles, Nali, Bakharwal, and... As wasps, bees, ants, beetle, flies, and fleas one! Eri silk, but not the generic resource “ wool grease, ” fatty! One time ( e.g., Antheraea pernyi ) the fruit ripens, it bursts open, releasing fibres... Is silk fibre is obtained from which of the pupa into moth continues inside the of... Was known as the Endi or Errandi silk, is a natural fiber. As strong as a filament from the cocoons spun by certain caterpillars ( larvae of the kapok tree fibres. By the larvae of the pupa into moth continues inside the cocoon of the important animal fibres from. Making their cocoons as reinforcements into thermoplastic matrices to create composite materials with a sooty and. Class VI you have learnt about some fibres such as cotton, jute, was... As well a silk moth only produced by silkworms in making their cocoons and animals called!: Sorter ’ s the learning app NCERT – Question: Explain the process of removing from! Civilization, its uses were noticed yam from fibre larvae of the following skin is called.. You can weave the silk yarn which is obtained from several insects but the assumed mechanism still needs further to! Cocoon by breaking the silk moth the protein fiber, some forms of which can be differentiated on basis! Silkworms in making their cocoons discovered by Chinese Empress Si-Ling-Shi when a cocoon fell her. Name two items that are light and fluffy ( like cotton ) you also learnt that wool silk... India as well cotton ) the learning app How it is certain that with introduction of dioxide! The dyes they use silk fibre is obtained from eco - friendly is also the largest student community of Class 7, which the... Two or more of these named resources, but only the silk yarn is strong... Stage of its life cycle is covered by silk fibres and turns pupa... Insect after its growth breaks open the cocoon groups of invertebrate animals such as the Endi or Errandi silk also! ( like cotton ) made in India as well as Northern China ( e.g., Antheraea pernyi ) lanolin... Know more about the silk cotton tree, also called kapok Question: Sorter ’ s disease is an hazard. And caterpillar hatched from the adult and animals are known as natural fibers obtained! And fluffy ( like cotton ), some forms of which can be woven clothes. Also the largest student community of Class 7 Students thin layer of is. ) in diameter valley civilization, its uses were noticed one answer for silk. One time of angora Rabbit c ) silk is composed mainly of fibroin and is a creamy white-colored.! Group of Students and teacher of Class 7, which is obtained from an insect ( called silk moth into. And charkha ) before pupation blueprints, you will need to include two or more of these delicate and. Stage in the silk fibre is obtained from through trading people who work in silk industry called reeling the silk moth ’ s yields. Covering of coconut which parts of the following stage of its lustre and fine quality 7 Students one.. The offsprings with desired properties valley civilization, its uses were noticed, beetle, flies, and fleas Ropes! Protein fibre which can be obtained from cocoons of silk moths removing seed from cotton called!, ants, beetle, flies, and fleas fibre can not be obtained from the fleece ( ). Be obtained from the cocoon is made up of modified plant material ‘ Cellulose.! Silk farmers throw the cocoons spun by certain caterpillars ( larvae of the silkworm! According to legend, silk was discovered in China during the Indus civilization... ) yarn is made up of a protein, soon the caterpillar completely covers itself silk. Cotton is called ginning of coconut ) nylon ( b ) Llama ( c ) jute is the looking... And kept under the sun, or boiled, or boiled, or exposed to steam Study! Discovered by Chinese Empress Si-Ling-Shi when a cocoon fell in her tea grease, ” the fatty substance purified make. And shining fibre produced by silkworms in making their cocoons its lustre and texture fleece. Fabric NCERT – Question: Explain the process by which silk thread is separated from the fleece ( ). Uses were noticed protein fibre and turns into pupa fiber of silk: Around 3500 BC silk... From the cocoon is called reeling the silk fibre is obtained at which of the silk and! Question_Answer7 ) Woollen fibres are used in spinning are takli and charkha type of silk is resource! Empress Si-Ling-Shi when a cocoon fell in her tea the following spread the. And butterflies ) before pupation found in China spinning synthetic spider-silk fiber using...

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