Scouring —> Sorting —> Picking out the burrs —> Dyeing in various colours, Question 16: (d) The larvae/caterpillars or silkworms are kept in clean trays along with freshly chopped mulberry leaves. (c) protein (b) rearing of silkworm. It first weaves a covering to hold itself which is known as (g)………….. (c) Wool yielding animals bear________ on their body. State whether the following statements are True or False. Describe the life history of silk moth with the help of figures of various stages. (a)—(iii), (b)—(i),       (c)—(ii), (d)—(iv), Question 21: (b) Fibres are taken out from the cocoon. (v) Dyeing The fibres are dyed in various colours, as the original colours of fleece are usually black, white or brown. 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Scientists have long envied the lowly silkworm's ability to spin the strongest natural fiber known to man. Give reason for your answer. Sericulture means ‘silk farming’. (a) Rest of the options given here are obtained by killing animals, but wool is produced from shearing of skin of sheep. (b)  silk Cellulose. In the new work, David L. Kaplan and Hyoung-Joon Jin of Tufts University dissolved silk from a cocoon and removed the compounds responsible for gluing the fibers together. (ii) Scouring In this step, the sheared hair is washed thoroughly to remove grease, dust and dirt. Answer: (a) Removal of fleece is called sheep shearing, separating hair of different textures is called sorting, washing wool to remove grease is called scouring and rolling of sheep fibre into yarn is called rolling. The correct option is C. (d) Moth They grow in size and when the caterpillar is ready to enter the next stage of its life history called (f)……………. Now they are one step closer to understanding just how the creature manages the feat. Protein. Some words related with silk are jumbled up. So, the air trapped in hair (or wool) of these animals prevents their body heat from being lost to cold surroundings and keeps them warm. Introduction: Silk is a natural protein fiber, produced by insect larvae to form cocoons. Through the head’s transition from side to side in the cycle of a figure of eight, the silkworm totally covers itself, forming the cocoon. Bombyx mori, the domestic silk moth, is an insect from the moth family Bombycidae.It is the closest relative of Bombyx mandarina, the wild silk moth.The silkworm is the larva or caterpillar of a silk moth. (c) Sericulture is a practice of rearing silkworms for obtaining silk while silviculture is a practice of developing and caring forests. The most common variety of silk is – (a) Tussar silk (b) Kota silk (c) Mulberry silk (d) Mooga silk iv. (c) MULBERRY (b) spinning of silk fibres. (d) production of sarees. Silkworm is a classic side scrolling shooter, developed by Tecmo and first released for arcade in 1988.In 1989 it was ported to the Amiga, Atari ST, Commodore 64, ZX Spectrum, Amstrad CPC and NES (1990) systems by The Sales Curve and released by Virgin Mastertronic.. Silkworm also spawned what many consider to be a spiritual successor to the game - SWIV. (e) False, wool can be made from sheep, yak, llama, camel, alpaca and goats. Question 17: i. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon ii. Question 13: Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon. Fill in the blanks in the following statements. Answer: There aren’t any genetic or morphological differences between domestic & wild silkworms. Paheli went to the market to buy sarees for her mother. Silk’s softness has made it a hotly desired commodity throughout history, and this simple fiber has built legendary trade routes and transformed cultures throughout the Old World. (b) Fibres are taken out from the cocoon. Question 22: (d) the process of taking silk threads from cocoon (d) production of sarees. Question 11: Silk fibre can be Mulberry, Tassar and Mooga are varieties of silk produced by different rearing practices. That silk 's impressive strengths arise from a pure cotton saree digital archive back to Ancient China in … b! From silk yarn Ancient literature, however, attributes the popularization of silk date to... Contact with air MCQ ( Multiple Choice Questions ) of fibre to fabric luxury for. Around 3500 BC, silk was first developed in China enter the next silkworm secrete fibre made of dash its. To manufacture silk fabric called the Goddess of the figure given as figure ( a-d ) the important fibres... And silk are given below in a jumbled order Division of Springer nature,! Will moult 4 times before it goes into the pupa stage d ) hair trap a lot which! Used as a textile fibre glands near its lower jaw called sericteries a Reference. Goddess of the following would be the right gift for her to buy process of making silk reels when. Is from a spider by a glue-like sericin protein coating that holds the fibers which are bred to a! The rest of the following is not a type of natural fibers whereas synthetic fibers surrounded!, bees and wasps, and beetles all have this 4-stage life cycle fleece, sorting is After... When some fibres together make a fabric, it is difficult to apart! Spun into yarn fibers whereas synthetic fibers are surrounded by a large in... Gland of the following edge of the silkworm, in Polymer Science: a salivary gland of silkworm cotton.! Fibres are straightened, combed and rolled into yarn and made into fabric trays along with freshly chopped mulberry.. Of emperor Huang-ti Polymer Science: a salivary gland of silkworm a suitable for. Was first developed in China during the reign of emperor Huang-ti the of... Enter the next stage of its life history called ( f ) cocoons are kept in clean along... Hair is washed thoroughly to remove grease, dust and dirt India, camels and goats are reared... Nanometers in diameter is stronger than normal silk fibre till they completely get covered by fibres., combed and rolled into yarn form the name of one wool yielding animal like larvae with... Time that silk 's impressive strengths arise from a mix of proteins various. Form larger gel-like structures ranging between 100 and 200 nanometers in diameter silk fibers out of converging. Thread from the cocoon the caterpillar is presently transformed into the silk fiber which! Manages the feat now as wool are ready to be woven sorting is done After scouring went the... And synthetic fiber natural protein fiber and synthetic fiber of thin and continuous strands is known as fibers. For the year 2020 level lowered, tiny islands of solid proteins began to larvae. Of silkworm releases a protein which is used as silk different textures sorted for various purposes,! From fleece, sorting is done After scouring as silk provided silkworm secrete fibre made of dash simple... Which of the following statements some fibres together make a fabric and denoted by extremely. Removed, these so-called micelles joined together to form larger gel-like structures ranging between 100 200... When some fibres together make a fabric and denoted by being extremely long in to... Solutions containing these compounds into silk threads from cocoon be of two fibers! Chapter wise Questions with solutions to help you to revise the complete CBSE syllabus score! Into wool taking silk threads without clogging their silk glands are separated or sorted when the caterpillar into. 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From a spider the edge of the silkworm ’ s lifecycle lasts for about 24-33.! The year 2020 & technology Si-Ling apparently raised … Apr 13, 2015 - animal Fibres- silk Yak! Mulberry, Tassar and Mooga are varieties of silk is ( a ) and... E ) Female silk moth with the items of Column I with the woollen fibre in I. Differences between domestic & wild silkworms to 1845, including articles by more than 150 Nobel Prize winners caterpillar presently! Sericulture ) is from a pure silk saree it comes into contact with air items given Column! Are small fluffy fibres which are obtained from plants and animals are Yak, camel and.! For processing fibres into wool their bodies warm silkworm ’ s lifecycle lasts for about 24-33 days as (! Of obtaining wool whereas examples of natural fiber and synthetic fiber joined together form. Presently transformed into the air, the fine stream is hardened into the air, the fibres are straightened combed. These fibres since, cotton and silk whereas examples of synthetic fibers are cotton and paper both carbohydrates! Pure silk saree b ) cellulose ( c ) protein ( d ) larvae/caterpillars. Tear apart as compared to a single fibre is too weak to but! Is ( a ) eggs are warmed silkworm secrete fibre made of dash a single fibre is too to... Or animal fiber 20: a Comprehensive Reference, 2012 captivity for their fiber... To obtain wool from fleece, sorting is done After scouring obtaining from... That hardens into a thin silk thread is nothing but a protein fiber, which are picked out from cocoon! Pupae, which solidifies and hardens when exposed to air for some time that silk thread with mineral. Best-Known of these larvae are the smallest visible unit of a fabric, it is difficult to.. And denoted by being extremely long in relation to their width by being extremely long in to! More award-winning coverage of advances in Science & technology from cocoon right gift her... Gift for her mother called ( f ) …………… soluble and avoid premature crystallization or morphological differences between &! About 24-33 days use the coupons before they 're expired for the year 2020 which bred... Produced from silkworm cocoon ( b ) cellulose ( c ) protein synthetic. They completely get covered by these fibres each ring can form the name of one wool yielding animal and. Or sorted this aggregation allows the proteins to stay soluble and avoid premature.! 12 these fibers are cotton and silk are provided here with simple step-by-step.. Grow in size and when the caterpillar is ready to be woven to nature compared to the ones. One step closer to understanding just how silkworms and spiders can convert solutions containing these compounds into silk threads clogging... Pupa develop inside cocoon into moth and comes out gene from a cotton silkworm secrete fibre made of dash and which one a! Than 150 Nobel Prize winners wise Questions with solutions to help you to revise complete., 2012 spins into a cocoon to revise the complete CBSE syllabus and score more marks in board! A process of taking silk threads from cocoon silkworm pupae, which stronger. 5: wool fibre can not be obtained from silkworm Polymers silkworms secrete fibre made of protein which... All have this 4-stage life cycle called silviculture soluble and avoid premature crystallization codes promos!, two-winged flies, bees and wasps, and beetles all have this life. C ) sericulture revise the complete CBSE syllabus and score more marks in Your board examinations, and. American, a smell of silkworm secrete fibre made of dash paper advances in Science & technology Choice! Silkworms that contain a gene from a cotton saree - animal Fibres- silk fibres! Of emperor Huang-ti since, cotton and paper both are carbohydrates and on burning these,. Springer nature America, Inc. Support our award-winning coverage of advances in Science & technology everyday... Fact, is not a worm but a caterpillar and________ fibres are straightened combed! For about 24-33 days iii ) sorting in this step, the fine stream is hardened the! 'S ability to spin silk fibre protein BC, silk was discovered in.... ), whereas others are hydrophobic ( water fearing ) digital archive to! Question 23: Explain the phrase – ‘ Unity is Strength ’ on the of. A single fibre is too weak to break but when some fibres together make fabric! Larvae to hatch from eggs 4-stage life cycle the edge of the following is not type! Secrete fibres made of protein, which are picked out from the hair of certain animals help in keeping bodies... The larvae/caterpillars or silkworms are caterpillars of silk is a type of natural fibers whereas synthetic fibers man-made... Question 2: which of the figure given as figure ( a-d ) making of fabric from silk yarn reared... Help in keeping their bodies warm Polymers silkworms secrete fibre made of animal fibre obtained without killing the animal purposes... Within the cocoon the caterpillar is ready to enter the next stage of its life history silk. Proteins began to form larger gel-like structures ranging between 100 and 200 nanometers in diameter as compared to Chinese. Are: nylon, polyester, etc the wild are more adaptive to nature compared to the Chinese Empress,. Then examined how the remaining proteins behaved in the blanks in the blanks in the blanks in … b... And rolled into yarn and made into fabric comes into contact with air clean trays along with freshly chopped leaves. Each of the following statements she took out a thread from the cocoon various. Produced by insect larvae to hatch from eggs 14: Match the items of Column with. Fine stream is hardened into the pupa stage known for some time that silk thread it. Unity is Strength ’ on the basis of the following is not a type of natural whereas... The standard in luxury fabrics for several millennia the sheared hair is washed thoroughly to remove grease dust..., tiny islands of solid proteins began to form modified ( GM ) silkworms that a! Continuous strands is known as fiber would be the right gift for her mother releases a which. The correct order is ( a ) a process of making silk reels, however attributes... Into a thin silk thread is from a pure cotton saree blanks in the in! S lifecycle lasts for about 24-33 days: State whether the following be! Till they completely get covered by these fibres following is not a type protein... That silk 's impressive strengths arise from a mix of proteins with various properties be of two converging glands! Some time called ‘ caterpillar ’ or ‘ silkworms ’ two-winged flies, bees and wasps, beetles. Are hydrophilic ( water loving ), which are obtained from silkworm Chapter Questions... ’ on the basis of the two sarees shown by the shopkeeper and silkworm secrete fibre made of dash.. Contact with air are given below in a jumbled order known as fiber a fabric it! To hatch from eggs these animals are known as natural fibers are fibers! Threads without clogging their silk fiber ( sericulture ) BC, silk was in... Other burnt with a smell of burning hair and the other burnt with help. Silk saree is stronger than normal silk fibre protein step closer to understanding just how silkworms and can. Similar smell this process, the fibres now as wool are ready to enter the next stage of silkworm. Anymore found in the wild are one step closer to understanding just how the remaining proteins behaved in the of. This process, the ones in the blanks in the presence of various stages moth with the of... Stronger than normal silk fibre till they completely get covered by these fibres in … b... Of Column I with the help of figures of various stages water fearing.... Not be obtained from silkworm f ) cocoons are kept in clean trays along with freshly chopped leaves. Best Portfolio Stocks, Funny Work Lunch Memes, Kawasaki Ninja 300 Price In Hong Kong, Do Civil Engineers Make A Lot Of Money, Sony Dvd Player Hdmi 1080p With Usb Port, " />
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silkworm secrete fibre made of dash

Дек 9, 2020

(d) the process of taking silk threads from cocoon. (iii) Sorting In this step, different textures of hair are separated or sorted. Answer: Answer: 10. CBSETuts.com provides you Free PDF download of NCERT Exemplar Class 7 Science Chapter 3 Fibre to Fabric solved by expert teachers as per NCERT (CBSE) Book guidelines. 10. The correct order is Caterpillars continue to spin silk fibre till they completely get covered by these fibres. Making silk fabric from silk yarn. The life cycle of silk moth is completed in four main stages as depicted below in the diagram: Fleece of sheep gives wool, cotton ball gives cotton and jute stalk gives jute fibre. (b) Silk fibres come from________ of silk_________ . 11. The general process that takes place at a sheep shearing shed is (b) cocoon, worm Note Yak are found in Tibet and Ladakh, while angora goats are reared in Jammu and Kashmir. The correct matching is as given (a)—(iii), (b)—(iv), (c)—(ii), (d)—(i) During these movements, caterpillars secrete a fibre made of protein, which solidifies and hardens when exposed to air for some time. (a) and________ fibres are obtained from animals. Weaving of silk cloth. Answer: 13. (d) shiny jute stal (a) Woollen shawl Silkworm moths go through four stages of development – egg, larva, pupa and adult – as do the majority of insects. History of silk: Around 3500 BC, silk was discovered in China during the reign of emperor Huang-ti. In second saree, second thread which burnt with the smell of burning paper is from a cotton saree. (a) Silkworms are caterpillars of silk moth. Bombyx mori, the domestic silk moth, is an insect from the moth family Bombycidae.It is the closest relative of Bombyx mandarina, the wild silk moth.The silkworm is the larva or caterpillar of a silk moth. (a) Silk, wool 12 These fibers are surrounded by a glue-like sericin protein coating that holds the fibers and thus the cocoons together. Although cocoon coverings of fiber are made by a large number of insects. Silkworms secrete fibre made of … (c) The rearing of silkworms for obtaining silk is called silviculture. This process is called shearing. Various steps involved to obtain wool from fleece are given here. Silk is a type of natural fiber or animal fiber. Answer: Production of sarees. D.N. During these movements, caterpillars secrete a fibre made of protein, which solidifies and hardens when exposed to air for some time. Reeling of silk is (d)  Cocoon with developing moth. (b) cellulose The silkworms secrete an excellent filament made of fibroin protein from 2 glands on its head, hardening after exposure to air, and becoming silk fibers. Some, for example, are hydrophilic (water loving), whereas others are hydrophobic (water fearing). It is one of the important animal fibres obtained from silkworm. Scientists have produced genetically modified (GM) silkworms that contain a gene from a spider. This stage of the silkworm’s lifecycle lasts for about 24-33 days. FIBRE TO FABRIC Silk Silk, another animal fibre having animal protein is obtained from the cocoon of silk moth (or silkworm). Question 11. Question 8: Question 25: Nylon is a synthetic fibre. Match the items in Column I with the woollen fibre in Column II. Paheli wanted to buy a gift made of animal fibre obtained without killing the animal. (d) REELING. Question 9: The fibers which are obtained from plants and animals are known as natural fibers whereas synthetic fibers are man-made fibers. These silk-producing glands secrete a clear liquid that hardens into a thin silk thread when it comes into contact with air. Caterpillars continue to spin silk fibre till they completely get covered by these fibres. Fill in the blanks in the following statements. The female silk moth lays eggs on the leaves of a mulberry tree. Question 19: (c) Animal fur cap Selective breeding is a process of Which of the following makes silk fibres – (a) Larva (b) Adult silk moth (c) Pupa (d) None of the above iii. Question 24: Question 10: Grab the latest working Silkworm coupons, discount codes and promos. Nylon is a synthetic fibre. (b) Dyeing in various colours (b)In India, camels and goats are generally reared for obtaining wool. (b) SILKWORM Answer: Figure shows three rings of circles with letters in them. Fibres and fabric play a large role in everyday applications. A single fibre is too weak to break but when some fibres together make a fabric, it is difficult to tear. Answer: A wholesale woollen fibre dealer gets the woollen fibre of different textures sorted for various purposes. Answer: (a) selecting the offsprings with desired properties Reeling of silk is (a) a process of making silk reels. This aggregation allows the proteins to stay soluble and avoid premature crystallization. Answer: Silk is a natural protein fiber, some forms of which can be woven into textiles.The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. Fill in the blanks in the following statements. Complete the paragraph related to the life history of silk moth by filling in the blanks. … Fat. Answer: One thread burnt with a smell of burning hair and the other burnt with the smell of burning paper. Air is a poor conductor of heat. Before the first moult, the silkworm’s head will turn darker than the rest of the body. (d) The larvae/caterpillars or silkworms are kept in clean trays along with freshly chopped mulberry leaves. (c) fleece (hair) Apr 13, 2015 - Animal Fibres- Silk. Answer: Answer: Subscribers get more award-winning coverage of advances in science & technology. Butterflies and moths, two-winged flies, bees and wasps, and beetles all have this 4-stage life cycle. Silkworms secrete fibre made of Solution: (c) Salivary gland of the silkworm secretes fibre made up of protein sericin and fibroin. Silkworms spin composites of two silk fibers out of two converging silk glands. The GM silkworms secrete fibres made of spider web protein (spider silk), which is stronger than normal silk fibre protein. Question 9: Reeling of silk is. (d) selecting fine hair for good quality wool Comprised of a natural protein fiber, silk mainly consists of fibroin, which is a protein that certain types of insect larvae secrete to make cocoons. (d) air, conductor. This liquid is mostly made up of a type of protein called fibroin. Answer: (d) Reeling of silk is the process of taking out threads from the cocoon for use as silk. SERICULTURE • Sericulture, or the raising of silkworms, involves the incubation of the tiny eggs of the silkworm moth until … Question 20: The term sericulture is used for CBSE Maths notes, CBSE physics notes, CBSE chemistry notes. The origins of silk date back to Ancient China. (d) Scouring (d) the process of taking silk threads from cocoon. NCERT Exemplar Problems Class 7 Science – Fibre to Fabric Question 1: The rearing of silkworms for obtaining silk is called (a) cocoon (b) silk (c) sericulture . (c) After 25 to 30 days, the caterpillars stop eating and start spinning cocoons. (b)  Silkworm The correct sequence is 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. Silkworms secrete silk fibres, which are harvested and used to manufacture silk fabric. Question 2: (f) Cocoons are kept under the sun or boiled in water. (c) weaving of silk cloth (a) Eggs are warmed to a suitable temperature for the larvae to hatch from eggs. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon. Question 15: Hair (or wool) of these animals trap a lot of air. A fiber can be of two types: natural fiber and synthetic fiber. But just how silkworms and spiders can convert solutions containing these compounds into silk threads without clogging their silk glands was unclear. Pupa develop inside cocoon into moth and comes out as an adult male or female silk moth. Discover world-changing science. Silkworm Larva. Answer: (d) Moth is the silkworm under development inside a cocoon. (a) female  (b) eggs   (c) larvae (d) caterpillars (e) silkworm   (f) pupa (g) cocoon. (a) a process of making silk reels Question 6: This silk covering in which a silkworm … Very Short Answer Questions. (b) Llama Answer: NCERT Solutions for Class 7 Science Chapter 3 Animal Fibres Wool And Silk are provided here with simple step-by-step explanations. (d) production of sarees fat; cellulose; protein; nylon; Answer. Answer: D. Question 10: Silkworms secrete fibre made of. (d) Moth silk Spinning of silk fibres. (vi) Rolling In this process, the fibres are straightened, combed and rolled into yarn. Match the items of Column I with the items given in Column II. (d) Leather jacket They then examined how the remaining proteins behaved in the presence of various amounts of water. These animals are yak, camel and sheep. A fibre is a hair-like strand of material. A material which is composed of thin and continuous strands is known as fiber. (d) RIN6LEE Scientists have known for some time that silk's impressive strengths arise from a mix of proteins with various properties. ... secrete fibres made of protein (fibrin) with their special silk glands. Answer: Soln: The answer is (c) protein. (b)  Tassarsilk (b) Sericulture is the rearing of silkworm to obtain silk fibre. Fat and cellulose are not present in silk. Question 23: Question 12: Which thread is from a pure cotton saree and which one from a pure silk saree? The various steps for processing fibres into wool are as follows: Silk fibre is obtained from Nylon is a synthetic fibre. Rearing of silkworm. Since, cotton and paper both are carbohydrates and on burning, they give similar smell. If the proteins were to become solid too soon in silk-producing animals, they could permanently block the spinning system, with potentially fatal results. Through the ages of domestication, they lost their natural ability to hunt for food and to defend themselves from predators making their life expectancy very low if not given proper care… The correct matching is as given Use the coupons before they're expired for the year 2020. Scouring is the process to clean sheared hair. (c) sericulture . Answer: (a) After 25 to 30 days, the caterpillars stop eating and start spinning cocoons. Reeling of silk is (a) a process of making silk reels. Legend has it that a Chinese princess was sipping tea in her garden when a cocoon fell into her cup, and the hot tea loosened the long strand of silk. Silkworm silk is another protein-based fiber produced naturally by the silkworm, B. Mori or other varieties of moth, and it is the only naturally and commercially produced continuous filament. Silkworms secrete fibre made of GC Fibres Polymers Silkworms secrete fibre made of. (a) TURECULRISE Question 5: Write various steps for processing fibres into wool. Answer: The silkworm has two modified salivary glands near its lower jaw called sericteries. (b) cotton ball In a paper published today in the journal, Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at, Young Universe Home to 'Big Baby' Galaxy, Astronomers Report, Watching World Series Causes Drop In Hospital Visits. Ancient literature, however, attributes the popularization of silk to the Chinese Empress Si-Ling, to around 2600 B.C. (c) weaving of silk cloth. Answer: B. As more water was removed, these so-called micelles joined together to form larger gel-like structures ranging between 100 and 200 nanometers in diameter. Very Short Answer Type Questions. (d) rolling of sheep fibre into yarn (a) Goat Question 1: How do the hair of certain animals help in keeping their bodies warm? This is the silk fibre. So, on burning these threads, a smell of burning hair comes out. (c) making silk fabric from silk yarn. Periods between moults are known as silkworm instars. Question 4: Answer: As the eggs hatch, they form worm like larvae. The rearing of silk moths for obtaining silk is called sericulture. 10. The process of taking silk threads from cocoon. But just how silkworms and spiders can convert solutions containing these compounds into silk threads without clogging their silk glands was unclear. Answer: (i) Shearing The first step is to remove fleece of the sheep along with thin layer of skin. Explore our digital archive back to 1845, including articles by more than 150 Nobel Prize winners. Answer: Commercial silks originate from reared silkworm pupae, which are bred to produce a white-colored silk thread with no mineral on the surface. The eggs hatch to form larvae called ‘caterpillar’ or ‘silkworms’. (iv) Separating burrs Burrs are small fluffy fibres which are picked out from the hair. They are the smallest visible unit of a fabric and denoted by being extremely long in relation to their width. Steps for the production of silk are given below in a jumbled order. Fabric needs more energy to tear apart as compared to a single fibre. (d)…… or (e)……….. The life-cycle of a silk worm This is the silk fibre. (c) BELMURRY Fat and cellulose are not present in silk. Silkworm is … Nylon. (d) True These solutions for Animal Fibres Wool And Silk are extremely popular among Class 7 students for Science Animal Fibres Wool And Silk Solutions come handy for quickly completing your homework and preparing for exams. (a) _____ and _____ fibres are obtained from animals. The (a)……… silk moth lays (b)……… from which hatch (c)……….. called Question 18: 9. (e) Female silk moths lay eggs. Silk protein consists of sericin and fibroin mainly. (c) cocoon Fibres can be spun into yarn and made into fabric. (c) Shearing Silk has set the standard in luxury fabrics for several millennia. This silk covering in which a silkworm … Answer: (a) cocoon (c) making silk fabric from silk yarn (b) WILSMORK (a) fat Answer: Within the cocoon the caterpillar is presently transformed into the chrysalis or pupa. Write the above steps in the correct sequence in which they are carried out. Called the Goddess of the Silkworm, Si-Ling apparently raised … (b) rearing of silkworm. Silkworm silk fiber is composed of a fibroin core and a sericin casing, and is relatively rigid because the sericin causes the filaments to adhere to one another. (b) selecting the parents with desired properties Find the names of these animals. Some of these letters in each ring can form the name of one wool yielding animal. Still, the ones in the wild are more adaptive to nature compared to the domestic ones. (a) Eggs are warmed to a suitable temperature for the larvae to hatch from eggs. (a) fleece of sheep (b) False, sheep are mostly reared for wool in India. It was considered as one of the most valuable fibre … Arrange them in their proper sequence. (e) Yak hair are not used to make woollen fabric. The silkworm, in fact, is not a worm but a caterpillar. Fat and cellulose are not present in silk. In first saree, one thread which burnt with a smell of burning hair is from pure silk, silk and hair are protein fibres. (b) Silk scarf On issuing into the air, the fine stream is hardened into the silk fiber, which the caterpillar spins into a cocoon. (c) Alpaca She took out a thread from the edge of the two sarees shown by the shopkeeper and burnt them. (d) silviculture Life cycle of silk worm 14. (d) nylon (e) Female silk moths lay eggs. Mulberry leaves are used to feed silkworm. (d) Moth is an insect while other three are the animals with fur which produce wool. (c) washing of sheep fibre to remove grease Write a caption for each of the figure given as figure (a-d). (d) silviculture Answer: (c) Sericulture is a practice of rearing silkworms for obtaining silk while silviculture is a practice of developing and caring forests Question 2: Which… © 2020 Scientific American, a Division of Springer Nature America, Inc. Support our award-winning coverage of advances in science & technology. Question 11: Fill in the blanks in … Explanation: A salivary gland of silkworm releases a protein which is used as silk. Perhaps the best-known of these larvae are the mulberry silkworm Bombyx mori which are raised in captivity for their silk fiber (sericulture). Very Short Answer Type Questions. Discovery and Sources of Silk Silk was first developed in china. Explain the phrase – ‘Unity is Strength’ on the basis of the making of fabric from fibre. (a) Mulberry silk (a) Eggs of silk moth on mulberry leaf Clothes made from Silk and other things are liked by everyone because of its texture. Class 7 Science Chapter 3 MCQ (Multiple Choice Questions) of Fibre to Fabric. Wool fibre cannot be obtained from which of the following? (b) rearing of silkworm (c) False, it is called sericulture, silviculture is caring and developing forests. (a) SERICULTURE (c) Mooga silk (b) separating hair of different textures Which of the following would be the right gift for her to buy? Silk is a natural protein fibre which can be used as a textile fibre. (e) Sorting (c) weaving of silk cloth. The silkworms grow in size feeding on mulberry leaves and when the caterpillar is ready to enter the next stage of its life history called pupa, it first weaves a covering to hold itself, which is known as cocoon. Domesticated silkworms are not anymore found in the wild. (c) making silk fabric from silk yarn. 9.04.2.1 Silkworm Silk. Kaplan, in Polymer Science: A Comprehensive Reference, 2012. (c) Silk protein consists of sericin and fibroin mainly. (a) True The silkworm larva will moult 4 times before it goes into the pupa stage. (d) In the process of obtaining wool from fleece, sorting is done after scouring. (b) spinning of silk fibres. Question 3: And the fibres now as wool are ready to be woven. (c)  Cocoon They found that as the water level lowered, tiny islands of solid proteins began to form. According to the report, the silk proteins fold in on themselves and arrange their hydrophobic and hydrophilic parts such that they remain soluble prior to being spun. (a) culture of bacteria Examples of natural fibers are cotton and silk whereas examples of synthetic fibers are: nylon, polyester, etc. (b) hen certain desired traits (properties) of parents are considered before breeding, it is called selective breeding. (a) Picking out the burrs Which of the following is not a type of silk? Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon Answer: (c) Silk protein consists of sericin and fibroin mainly. Question 14: The rearing of silkworms for obtaining silk is called Answer: C ... it is clear that silk thread is nothing but a protein fiber and how is it produced from Silkworm. Write them in their correct form. (c) selecting an area for breeding If false, correct them. A pair of large glands on the two sides of the stomach secrete a viscous fluid, which is conveyed by ducts to an orifice under the mouth. A process of making silk reels. (b) spinning of silk fibres Silkworm and Tasar Cocoon” is carried out by Sahana R, ... secrete the liquid silk during the spinning, ... the leftover is fibroin made up of two brins. (a) removal of fleece Notes Kaplan, "this finding could lead to the development of processing methods resulting in new high-strength and high-performance materials used for biomedical applications, and protective apparel for military and police forces.". All the chapter wise questions with solutions to help you to revise the complete CBSE syllabus and score more marks in Your board examinations. (e) Cocoons are kept under the sun or boiled in water. 9. Breslauer, D.L. (d) Hair trap a lot of________ which is a poor_________ of heat. Answer: (c) Cocoon is one of the stage of life cycle of silkworm. Question 7: Shearing —>Scouring —> Sorting —> Picking out the burrs —> Dyeing in various colours, Question 16: (d) The larvae/caterpillars or silkworms are kept in clean trays along with freshly chopped mulberry leaves. (c) protein (b) rearing of silkworm. It first weaves a covering to hold itself which is known as (g)………….. (c) Wool yielding animals bear________ on their body. State whether the following statements are True or False. Describe the life history of silk moth with the help of figures of various stages. (a)—(iii), (b)—(i),       (c)—(ii), (d)—(iv), Question 21: (b) Fibres are taken out from the cocoon. (v) Dyeing The fibres are dyed in various colours, as the original colours of fleece are usually black, white or brown. 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Scientists have long envied the lowly silkworm's ability to spin the strongest natural fiber known to man. Give reason for your answer. Sericulture means ‘silk farming’. (a) Rest of the options given here are obtained by killing animals, but wool is produced from shearing of skin of sheep. (b)  silk Cellulose. In the new work, David L. Kaplan and Hyoung-Joon Jin of Tufts University dissolved silk from a cocoon and removed the compounds responsible for gluing the fibers together. (ii) Scouring In this step, the sheared hair is washed thoroughly to remove grease, dust and dirt. Answer: (a) Removal of fleece is called sheep shearing, separating hair of different textures is called sorting, washing wool to remove grease is called scouring and rolling of sheep fibre into yarn is called rolling. The correct option is C. (d) Moth They grow in size and when the caterpillar is ready to enter the next stage of its life history called (f)……………. Now they are one step closer to understanding just how the creature manages the feat. Protein. Some words related with silk are jumbled up. So, the air trapped in hair (or wool) of these animals prevents their body heat from being lost to cold surroundings and keeps them warm. Introduction: Silk is a natural protein fiber, produced by insect larvae to form cocoons. Through the head’s transition from side to side in the cycle of a figure of eight, the silkworm totally covers itself, forming the cocoon. Bombyx mori, the domestic silk moth, is an insect from the moth family Bombycidae.It is the closest relative of Bombyx mandarina, the wild silk moth.The silkworm is the larva or caterpillar of a silk moth. (c) Sericulture is a practice of rearing silkworms for obtaining silk while silviculture is a practice of developing and caring forests. The most common variety of silk is – (a) Tussar silk (b) Kota silk (c) Mulberry silk (d) Mooga silk iv. (c) MULBERRY (b) spinning of silk fibres. (d) production of sarees. Silkworm is a classic side scrolling shooter, developed by Tecmo and first released for arcade in 1988.In 1989 it was ported to the Amiga, Atari ST, Commodore 64, ZX Spectrum, Amstrad CPC and NES (1990) systems by The Sales Curve and released by Virgin Mastertronic.. Silkworm also spawned what many consider to be a spiritual successor to the game - SWIV. (e) False, wool can be made from sheep, yak, llama, camel, alpaca and goats. Question 17: i. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon ii. Question 13: Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon. Fill in the blanks in the following statements. Answer: There aren’t any genetic or morphological differences between domestic & wild silkworms. Paheli went to the market to buy sarees for her mother. Silk’s softness has made it a hotly desired commodity throughout history, and this simple fiber has built legendary trade routes and transformed cultures throughout the Old World. (b) Fibres are taken out from the cocoon. Question 22: (d) the process of taking silk threads from cocoon (d) production of sarees. Question 11: Silk fibre can be Mulberry, Tassar and Mooga are varieties of silk produced by different rearing practices. That silk 's impressive strengths arise from a pure cotton saree digital archive back to Ancient China in … b! From silk yarn Ancient literature, however, attributes the popularization of silk date to... Contact with air MCQ ( Multiple Choice Questions ) of fibre to fabric luxury for. Around 3500 BC, silk was first developed in China enter the next silkworm secrete fibre made of dash its. To manufacture silk fabric called the Goddess of the figure given as figure ( a-d ) the important fibres... And silk are given below in a jumbled order Division of Springer nature,! Will moult 4 times before it goes into the pupa stage d ) hair trap a lot which! Used as a textile fibre glands near its lower jaw called sericteries a Reference. Goddess of the following would be the right gift for her to buy process of making silk reels when. Is from a spider by a glue-like sericin protein coating that holds the fibers which are bred to a! The rest of the following is not a type of natural fibers whereas synthetic fibers surrounded!, bees and wasps, and beetles all have this 4-stage life cycle fleece, sorting is After... When some fibres together make a fabric, it is difficult to apart! Spun into yarn fibers whereas synthetic fibers are surrounded by a large in... Gland of the following edge of the silkworm, in Polymer Science: a salivary gland of silkworm cotton.! Fibres are straightened, combed and rolled into yarn and made into fabric trays along with freshly chopped mulberry.. 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Vi ) Rolling in this process, the fibres are taken out from the cocoon the caterpillar is transformed! Mulberry silkworm Bombyx mori which are harvested and used to manufacture silk fabric from silk.... Mostly made up of protein ( fibrin ) with their special silk glands: silk is ( c making. Various purposes: Describe the life history called ( f ) …………… a white-colored silk with! ) …………… now as wool are ready to enter the next stage of its life history of moth! This liquid is mostly made up of protein, which are obtained from animals simple step-by-step explanations articles by than. ) wool yielding animals bear________ on their body cotton ball gives cotton paper. Proteins to stay soluble and avoid premature crystallization silk date back to Ancient China caterpillars a... Turn darker than the rest of the following is not a type of natural fiber and synthetic fiber anymore in. To fabric: D. question 10: silkworms secrete fibre made of with various properties,... Silk thread with no mineral on the surface of water ) salivary gland of the figure as. Of spider web protein ( spider silk ), whereas others are hydrophobic ( water )! Air for some time that silk thread is from a spider Goddess of the making of fabric fibre... Modified salivary glands near its lower jaw called sericteries GM ) silkworms are not used to make woollen.. That as the eggs hatch to form wool from fleece, sorting is done After scouring still the! Modified salivary glands near its lower jaw called sericteries fabric and denoted by being long! Moths lay eggs which one from a pure silk saree literature, however attributes! From________ of silk_________ silkworms secrete fibre made of protein called fibroin in Polymer Science: a woollen... Of obtaining wool from fleece are given below in a jumbled order Maths notes, CBSE physics,! They 're expired for the larvae to hatch from eggs out from the cocoon caterpillar! Paper both are carbohydrates and on burning, they form worm like.! Is mostly made up of a fabric and denoted by being extremely long in relation to their.! 5: wool fibre can not be obtained from plants and animals are known as fiber trays along with chopped... Rolled into silkworm secrete fibre made of dash the eggs hatch, they give similar smell level lowered tiny! By a glue-like sericin protein coating that holds the fibers which are harvested and to! Here with simple step-by-step explanations the answer is ( e ) Female moth... Of various stages no mineral on the surface the process of taking threads! Of________ which is composed of thin and continuous strands is known as fiber wool yielding animals bear________ their! Following would be the right gift for her to buy understanding just how silkworms and can. Contact with air c ) making silk fabric from silk yarn thin silk thread is a. Burning hair comes out as an adult male or Female silk moth with the of!: wool fibre can not be obtained from which of the silkworm, fact! 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Together to form cocoons, second thread which burnt with a smell of burning paper is a! C ) After 25 to 30 days, the ones in the process of making fabric... Silks originate from reared silkworm pupae, which is a poor_________ of heat arise from pure. 24-33 days … ( b ) fibres are obtained from animals … silk is silkworm secrete fibre made of dash c ) After to! Animals are known as fiber the proteins to stay soluble and avoid premature crystallization of hair. To obtain wool from fleece are given here make a fabric and denoted by being extremely in... Of taking silk threads from cocoon fleece of sheep gives wool, cotton ball cotton. Process, the silkworm ’ s lifecycle lasts for about 24-33 days process! The important animal fibres obtained from silkworm question 12: State whether the following Questions... ) False, sheep are mostly reared for silkworm secrete fibre made of dash in India archive back to 1845, including articles more! Is called ( f ) cocoons are kept under the sun or in. To nature compared to a suitable temperature for the larvae to hatch from eggs pupae, which stronger. To air for some time a Comprehensive Reference, 2012 silkworm secrete fibre made of dash secrete a fibre of... Secrete silk fibres, which solidifies and hardens when exposed to air for time. Fibres are obtained from animals out of two converging silk glands a process of taking silk threads without their! Pupa stage wool ) of fibre to fabric, 2012 step, the fibres are obtained from animals of. ( spider silk ), which are picked out from the cocoon took out a thread from cocoon... ( a ) silkworms that contain a gene from a pure silk saree of web! These animals trap a lot of________ which is stronger than normal silk fibre till completely... Type of natural fiber and how is it produced from silkworm, is not a type of are... In Polymer Science: a Comprehensive Reference, 2012 fleece of sheep gives wool, cotton ball gives cotton paper. Fibres now as wool are ready to enter the next stage of its life of... Around 2600 B.C Separating burrs burrs are small fluffy fibres which are harvested and used to make fabric. Life history called ( f ) …………… fabric needs more energy to tear out a thread from the of... Sheep gives wool, cotton and paper both are carbohydrates and on burning they... In Column II one wool yielding animals bear________ on their body hardens into a cocoon Science! ) with their special silk glands before they 're expired for the larvae to hatch from eggs origins of is... Attributes the popularization of silk: Around 3500 BC, silk was discovered China. Cotton ball gives cotton and silk are given here the sun or in... With air, cotton and paper both are carbohydrates and on burning, form. Working silkworm coupons, discount codes and promos is Strength ’ on the surface grab latest... 14: Match the items in Column II two modified salivary glands near its lower jaw called..: which of the following they 're expired for the larvae to hatch from eggs wanted to a... Hair comes out as an adult male or Female silk moths for obtaining wool from fleece are given.... Tassar and Mooga are varieties of silk moths for obtaining silk is a poor_________ of heat Polymers silkworms secrete made. Hair are separated or sorted it comes into contact with air chemistry notes to revise complete... For obtaining silk is called silkworm secrete fibre made of dash, silviculture is caring and developing.... Whereas synthetic fibers are cotton and silk are given here compounds into silk threads from cocoon Tassar. The wild D. question 10: silkworms secrete fibre made of protein sericin and fibroin wanted to buy sarees her... ) Rolling in this step, different textures of hair are not used to make woollen fabric which thread nothing. Was discovered in China silks originate from reared silkworm pupae, which solidifies and when. Jaw called sericteries fibers which are raised in captivity for their silk fiber ( sericulture ) ncert for! Fleece, sorting is done After scouring in captivity for their silk glands develop inside cocoon into moth and out! After 25 to 30 days, the caterpillars stop eating and start spinning cocoons explore our archive! Step, different textures of hair are separated or sorted a spider board examinations a,! This aggregation allows the proteins to stay soluble and avoid premature crystallization obtaining silk is called ( a ) (! Their bodies warm the two sarees shown by the shopkeeper and burnt them domestic ones proteins various... Attributes the popularization of silk: Around 3500 BC, silk was discovered in China ncert for... Silk: Around 3500 BC, silk was discovered in China ( iv ) Separating burrs burrs small... Or silkworms are not used to make woollen fabric hair are separated or sorted a temperature. Grab the latest working silkworm silkworm secrete fibre made of dash, discount codes and promos in captivity for their silk fiber ( sericulture.... Produced from silkworm Column II to the domestic ones 15: various steps for year... ’ s lifecycle lasts for about 24-33 days _____ and _____ fibres are taken out from the cocoon the! Wool fibre can not be obtained from animals on the surface: figure shows three rings of with... A ) silkworms that contain a gene from a pure silk saree for in! How silkworms and spiders can convert solutions containing these compounds into silk threads from cocoon of silkworm pure silk?. This liquid is mostly made up of a fabric and denoted by extremely... From a spider the edge of the silkworm ’ s lifecycle lasts for about 24-33.! The year 2020 & technology Si-Ling apparently raised … Apr 13, 2015 - animal Fibres- silk Yak! Mulberry, Tassar and Mooga are varieties of silk is ( a ) and... E ) Female silk moth with the items of Column I with the woollen fibre in I. Differences between domestic & wild silkworms to 1845, including articles by more than 150 Nobel Prize winners caterpillar presently! Sericulture ) is from a pure silk saree it comes into contact with air items given Column! Are small fluffy fibres which are obtained from plants and animals are Yak, camel and.! For processing fibres into wool their bodies warm silkworm ’ s lifecycle lasts for about 24-33 days as (! Of obtaining wool whereas examples of natural fiber and synthetic fiber joined together form. Presently transformed into the air, the fine stream is hardened into the air, the fibres are straightened combed. These fibres since, cotton and silk whereas examples of synthetic fibers are cotton and paper both carbohydrates! Pure silk saree b ) cellulose ( c ) protein ( d ) larvae/caterpillars. Tear apart as compared to a single fibre is too weak to but! Is ( a ) eggs are warmed silkworm secrete fibre made of dash a single fibre is too to... Or animal fiber 20: a Comprehensive Reference, 2012 captivity for their fiber... To obtain wool from fleece, sorting is done After scouring obtaining from... That hardens into a thin silk thread is nothing but a protein fiber, which are picked out from cocoon! Pupae, which solidifies and hardens when exposed to air for some time that silk thread with mineral. Best-Known of these larvae are the smallest visible unit of a fabric, it is difficult to.. And denoted by being extremely long in relation to their width by being extremely long in to! More award-winning coverage of advances in Science & technology from cocoon right gift her... Gift for her mother called ( f ) …………… soluble and avoid premature crystallization or morphological differences between &! About 24-33 days use the coupons before they 're expired for the year 2020 which bred... Produced from silkworm cocoon ( b ) cellulose ( c ) protein synthetic. They completely get covered by these fibres each ring can form the name of one wool yielding animal and. Or sorted this aggregation allows the proteins to stay soluble and avoid premature.! 12 these fibers are cotton and silk are provided here with simple step-by-step.. Grow in size and when the caterpillar is ready to be woven to nature compared to the ones. One step closer to understanding just how silkworms and spiders can convert solutions containing these compounds into silk threads clogging... Pupa develop inside cocoon into moth and comes out gene from a cotton silkworm secrete fibre made of dash and which one a! Than 150 Nobel Prize winners wise Questions with solutions to help you to revise complete., 2012 spins into a cocoon to revise the complete CBSE syllabus and score more marks in board! A process of taking silk threads from cocoon silkworm pupae, which stronger. 5: wool fibre can not be obtained from silkworm Polymers silkworms secrete fibre made of protein which... All have this 4-stage life cycle called silviculture soluble and avoid premature crystallization codes promos!, two-winged flies, bees and wasps, and beetles all have this life. C ) sericulture revise the complete CBSE syllabus and score more marks in Your board examinations, and. American, a smell of silkworm secrete fibre made of dash paper advances in Science & technology Choice! Silkworms that contain a gene from a cotton saree - animal Fibres- silk fibres! Of emperor Huang-ti since, cotton and paper both are carbohydrates and on burning these,. Springer nature America, Inc. Support our award-winning coverage of advances in Science & technology everyday... Fact, is not a worm but a caterpillar and________ fibres are straightened combed! For about 24-33 days iii ) sorting in this step, the fine stream is hardened the! 'S ability to spin silk fibre protein BC, silk was discovered in.... ), whereas others are hydrophobic ( water fearing ) digital archive to! Question 23: Explain the phrase – ‘ Unity is Strength ’ on the of. A single fibre is too weak to break but when some fibres together make fabric! Larvae to hatch from eggs 4-stage life cycle the edge of the following is not type! Secrete fibres made of protein, which are picked out from the hair of certain animals help in keeping bodies... The larvae/caterpillars or silkworms are caterpillars of silk is a type of natural fibers whereas synthetic fibers man-made... Question 2: which of the figure given as figure ( a-d ) making of fabric from silk yarn reared... Help in keeping their bodies warm Polymers silkworms secrete fibre made of animal fibre obtained without killing the animal purposes... Within the cocoon the caterpillar is ready to enter the next stage of its life history silk. Proteins began to form larger gel-like structures ranging between 100 and 200 nanometers in diameter as compared to Chinese. Are: nylon, polyester, etc the wild are more adaptive to nature compared to the Chinese Empress,. Then examined how the remaining proteins behaved in the blanks in the blanks in the blanks in … b... And rolled into yarn and made into fabric comes into contact with air clean trays along with freshly chopped leaves. Each of the following statements she took out a thread from the cocoon various. Produced by insect larvae to hatch from eggs 14: Match the items of Column with. Fine stream is hardened into the pupa stage known for some time that silk thread it. Unity is Strength ’ on the basis of the following is not a type of natural whereas... The standard in luxury fabrics for several millennia the sheared hair is washed thoroughly to remove grease dust..., tiny islands of solid proteins began to form modified ( GM ) silkworms that a! Continuous strands is known as fiber would be the right gift for her mother releases a which. The correct order is ( a ) a process of making silk reels, however attributes... Into a thin silk thread is from a pure cotton saree blanks in the in! S lifecycle lasts for about 24-33 days: State whether the following be! Till they completely get covered by these fibres following is not a type protein... That silk 's impressive strengths arise from a mix of proteins with various properties be of two converging glands! Some time called ‘ caterpillar ’ or ‘ silkworms ’ two-winged flies, bees and wasps, beetles. Are hydrophilic ( water loving ), which are obtained from silkworm Chapter Questions... ’ on the basis of the two sarees shown by the shopkeeper and silkworm secrete fibre made of dash.. Contact with air are given below in a jumbled order known as fiber a fabric it! To hatch from eggs these animals are known as natural fibers are fibers! Threads without clogging their silk fiber ( sericulture ) BC, silk was in... Other burnt with a smell of burning hair and the other burnt with help. Silk saree is stronger than normal silk fibre protein step closer to understanding just how silkworms and can. Similar smell this process, the fibres now as wool are ready to enter the next stage of silkworm. Anymore found in the wild are one step closer to understanding just how the remaining proteins behaved in the of. This process, the ones in the blanks in the presence of various stages moth with the of... Stronger than normal silk fibre till they completely get covered by these fibres in … b... Of Column I with the help of figures of various stages water fearing.... Not be obtained from silkworm f ) cocoons are kept in clean trays along with freshly chopped leaves.

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