Air is a poor conductor of heat. (c) Alpaca Shearing —>Scouring —> Sorting —> Picking out the burrs —> Dyeing in various colours, Question 16: Before the first moult, the silkworm’s head will turn darker than the rest of the body. (a) Silkworms are caterpillars of silk moth. Which thread is from a pure cotton saree and which one from a pure silk saree? D.N. This is the silk fibre. 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. 13. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon Answer: (c) Silk protein consists of sericin and fibroin mainly. In second saree, second thread which burnt with the smell of burning paper is from a cotton saree. (ii) Scouring In this step, the sheared hair is washed thoroughly to remove grease, dust and dirt. (b) hen certain desired traits (properties) of parents are considered before breeding, it is called selective breeding. (c) Wool yielding animals bear________ on their body. There aren’t any genetic or morphological differences between domestic & wild silkworms. Reeling of silk is (a) a process of making silk reels. Question 11. Now they are one step closer to understanding just how the creature manages the feat. Clothes made from Silk and other things are liked by everyone because of its texture. Question 2: It first weaves a covering to hold itself which is known as (g)………….. A fiber can be of two types: natural fiber and synthetic fiber. The most common variety of silk is – (a) Tussar silk (b) Kota silk (c) Mulberry silk (d) Mooga silk iv. They are the smallest visible unit of a fabric and denoted by being extremely long in relation to their width. Question 23: A fibre is a hair-like strand of material. (b) rearing of silkworm. A single fibre is too weak to break but when some fibres together make a fabric, it is difficult to tear. (c) Animal fur cap Fabric needs more energy to tear apart as compared to a single fibre. (b) spinning of silk fibres (d) rolling of sheep fibre into yarn 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. Question 5: NCERT Solutions for Class 7 Science Chapter 3 Animal Fibres Wool And Silk are provided here with simple step-by-step explanations. (iv) Separating burrs Burrs are small fluffy fibres which are picked out from the hair. 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. (d) production of sarees Explanation: A salivary gland of silkworm releases a protein which is used as silk. The correct option is C. Answer: B. (d) The larvae/caterpillars or silkworms are kept in clean trays along with freshly chopped mulberry leaves. Fill in the blanks in the following statements. 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. 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. As the eggs hatch, they form worm like larvae. (b) Fibres are taken out from the cocoon. 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. Question 24: (i) Shearing The first step is to remove fleece of the sheep along with thin layer of skin. (d) shiny jute stal Apr 13, 2015 - Animal Fibres- Silk. (b) Sericulture is the rearing of silkworm to obtain silk fibre. (a) Eggs are warmed to a suitable temperature for the larvae to hatch from eggs. Question 9: Some words related with silk are jumbled up. Weaving of silk cloth. Give reason for your answer. Question 18: 9. Answer: (d) the process of taking silk threads from cocoon. Write the above steps in the correct sequence in which they are carried out. 9.04.2.1 Silkworm Silk. (a) Silk, wool Although cocoon coverings of fiber are made by a large number of insects. (a) Goat The general process that takes place at a sheep shearing shed is They grow in size and when the caterpillar is ready to enter the next stage of its life history called (f)……………. Question 12: Answer: Called the Goddess of the Silkworm, Si-Ling apparently raised … (c) Silk protein consists of sericin and fibroin mainly. 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. Silkworms spin composites of two silk fibers out of two converging silk glands. (c) weaving of silk cloth. (d) Moth is the silkworm under development inside a cocoon. 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. (c) False, it is called sericulture, silviculture is caring and developing forests. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon. (c) making silk fabric from silk yarn Spinning of silk fibres. The female silk moth lays eggs on the leaves of a mulberry tree. A material which is composed of thin and continuous strands is known as fiber. The life-cycle of a silk worm Describe the life history of silk moth with the help of figures of various stages. (d) production of sarees. (d) Moth 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.". Mulberry leaves are used to feed silkworm. The fibers which are obtained from plants and animals are known as natural fibers whereas synthetic fibers are man-made fibers. Scientists have long envied the lowly silkworm's ability to spin the strongest natural fiber known to man. (b) cotton ball The life cycle of silk moth is completed in four main stages as depicted below in the diagram: But just how silkworms and spiders can convert solutions containing these compounds into silk threads without clogging their silk glands was unclear. Class 7 Science Chapter 3 MCQ (Multiple Choice Questions) of Fibre to Fabric. (d)…… or (e)……….. The silkworm larva will moult 4 times before it goes into the pupa stage. Write them in their correct form. The correct matching is as given (a)—(iii), (b)—(iv), (c)—(ii), (d)—(i) On issuing into the air, the fine stream is hardened into the silk fiber, which the caterpillar spins into a cocoon. The (a)……… silk moth lays (b)……… from which hatch (c)……….. called Answer: Question 11: Fill in the blanks in … (c) After 25 to 30 days, the caterpillars stop eating and start spinning cocoons. Answer: (d) Hair trap a lot of________ which is a poor_________ of heat. Ancient literature, however, attributes the popularization of silk to the Chinese Empress Si-Ling, to around 2600 B.C. A process of making silk reels. (v) Dyeing The fibres are dyed in various colours, as the original colours of fleece are usually black, white or brown. (c) selecting an area for breeding Answer: (c) BELMURRY 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. (b) Silk fibres come from________ of silk_________ . Match the items of Column I with the items given in Column II. Question 11: (a) culture of bacteria 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. 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 . Fibres and fabric play a large role in everyday applications. Discover world-changing science. The process of taking silk threads from cocoon. Wool fibre cannot be obtained from which of the following? One thread burnt with a smell of burning hair and the other burnt with the smell of burning paper. (a) Mulberry silk Question 19: 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. During these movements, caterpillars secrete a fibre made of protein, which solidifies and hardens when exposed to air for some time. (d)  Cocoon with developing moth. 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. Write a caption for each of the figure given as figure (a-d). 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. Answer: Scientists have produced genetically modified (GM) silkworms that contain a gene from a spider. 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. Some of these letters in each ring can form the name of one wool yielding animal. Rearing of silkworm. (b) cocoon, worm (b) False, sheep are mostly reared for wool in India. (a) and________ fibres are obtained from animals. It is one of the important animal fibres obtained from silkworm. (c) Cocoon is one of the stage of life cycle of silkworm. Answer: Nylon is a synthetic fibre. Fill in the blanks in the following statements. Silkworm moths go through four stages of development – egg, larva, pupa and adult – as do the majority of insects. (b)  Silkworm 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. (a) a process of making silk reels (e) Female silk moths lay eggs. State whether the following statements are True or False. (d) the process of taking silk threads from cocoon. ... secrete fibres made of protein (fibrin) with their special silk glands. Question 6: Soln: The answer is (c) protein. Butterflies and moths, two-winged flies, bees and wasps, and beetles all have this 4-stage life cycle. The correct sequence is Explain the phrase – ‘Unity is Strength’ on the basis of the making of fabric from fibre. Domesticated silkworms are not anymore found in the wild. (a) fat Sericulture means ‘silk farming’. Which of the following would be the right gift for her to buy? … Fat. (a) After 25 to 30 days, the caterpillars stop eating and start spinning cocoons. Fill in the blanks in the following statements. 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. Question 10: (d) Leather jacket Answer: Question 15: Steps for the production of silk are given below in a jumbled order. During these movements, caterpillars secrete a fibre made of protein, which solidifies and hardens when exposed to air for some time. (b) selecting the parents with desired properties Find the names of these animals. 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Question 20: 9. Silkworm Larva. Complete the paragraph related to the life history of silk moth by filling in the blanks. 11. Protein. This process is called shearing. (c) sericulture . Some, for example, are hydrophilic (water loving), whereas others are hydrophobic (water fearing). But just how silkworms and spiders can convert solutions containing these compounds into silk threads without clogging their silk glands was unclear. (b) SILKWORM 12 These fibers are surrounded by a glue-like sericin protein coating that holds the fibers and thus the cocoons together. Perhaps the best-known of these larvae are the mulberry silkworm Bombyx mori which are raised in captivity for their silk fiber (sericulture). (a) True (vi) Rolling In this process, the fibres are straightened, combed and rolled into yarn. Silk is a type of natural fiber or animal fiber. Silk fibre is obtained from Answer: Introduction: Silk is a natural protein fiber, produced by insect larvae to form cocoons. (a) fleece of sheep (b)  silk Selective breeding is a process of She took out a thread from the edge of the two sarees shown by the shopkeeper and burnt them. Answer: D. Question 10: Silkworms secrete fibre made of. The rearing of silkworms for obtaining silk is called Scientists have known for some time that silk's impressive strengths arise from a mix of proteins with various properties. If false, correct them. (b) rearing of silkworm (a) cocoon 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. 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. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon. (c) weaving of silk cloth 10. Question 1: Question 25: (c) MULBERRY Answer: Question 3: (d) Moth is an insect while other three are the animals with fur which produce wool. Which of the following is not a type of silk? (c) Shearing Answer: Nylon is a synthetic fibre. (a) SERICULTURE (c) washing of sheep fibre to remove grease (b) cellulose These silk-producing glands secrete a clear liquid that hardens into a thin silk thread when it comes into contact with air. Answer: CBSE Maths notes, CBSE physics notes, CBSE chemistry notes. Paheli went to the market to buy sarees for her mother. (iii) Sorting In this step, different textures of hair are separated or sorted. Scouring is the process to clean sheared hair. Question 17: Silkworm is … Question 4: (b) spinning of silk fibres. Commercial silks originate from reared silkworm pupae, which are bred to produce a white-colored silk thread with no mineral on the surface. (d) REELING. 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. Nylon. Answer: Silkworms secrete fibre made of (e) Sorting Match the items in Column I with the woollen fibre in Column II. Reeling of silk is (a) a process of making silk reels. Answer: Breslauer, D.L. This is the silk fibre. A wholesale woollen fibre dealer gets the woollen fibre of different textures sorted for various purposes. (b) rearing of silkworm. (a) Eggs are warmed to a suitable temperature for the larvae to hatch from eggs. ... it is clear that silk thread is nothing but a protein fiber and how is it produced from Silkworm. Figure shows three rings of circles with letters in them. So, on burning these threads, a smell of burning hair comes out. Silk has set the standard in luxury fabrics for several millennia. How do the hair of certain animals help in keeping their bodies warm? Silk is a natural protein fibre which can be used as a textile fibre. i. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon ii. Cellulose. (d) True (a)—(iii), (b)—(i),       (c)—(ii), (d)—(iv), Question 21: (c)  Cocoon They found that as the water level lowered, tiny islands of solid proteins began to form. The eggs hatch to form larvae called ‘caterpillar’ or ‘silkworms’. The rearing of silk moths for obtaining silk is called sericulture. (b) WILSMORK Arrange them in their proper sequence. Subscribers get more award-winning coverage of advances in science & technology. This aggregation allows the proteins to stay soluble and avoid premature crystallization. (c) Mooga silk (b) Fibres are taken out from the cocoon. (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 matching is as given This silk covering in which a silkworm … Fibres can be spun into yarn and made into fabric. (d) In the process of obtaining wool from fleece, sorting is done after scouring. Answer: Answer: Reeling of silk is (d) air, conductor. Making silk fabric from silk yarn. (c) fleece (hair) (e) Yak hair are not used to make woollen fabric. (d) the process of taking silk threads from cocoon Grab the latest working Silkworm coupons, discount codes and promos. (e) False, wool can be made from sheep, yak, llama, camel, alpaca and goats. Very Short Answer Type Questions. The silkworm, in fact, is not a worm but a caterpillar. Use the coupons before they're expired for the year 2020. (a) Rest of the options given here are obtained by killing animals, but wool is produced from shearing of skin of sheep. Caterpillars continue to spin silk fibre till they completely get covered by these fibres. This stage of the silkworm’s lifecycle lasts for about 24-33 days. (d) Moth silk Note Yak are found in Tibet and Ladakh, while angora goats are reared in Jammu and Kashmir. Kaplan, in Polymer Science: A Comprehensive Reference, 2012. (a) Picking out the burrs If the proteins were to become solid too soon in silk-producing animals, they could permanently block the spinning system, with potentially fatal results. Days, the caterpillars stop eating and start spinning cocoons silk 's impressive strengths from. Solutions for class 7 Science Chapter 3 animal fibres wool and silk whereas examples of synthetic are. Make woollen fabric, to Around 2600 B.C of insects for some time which burnt with a smell burning... 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With simple step-by-step explanations America, Inc. Support our award-winning coverage of advances Science... Silk ), which solidifies and hardens when exposed to air for some time that silk 's impressive strengths from. Not anymore found in the wild hatch from eggs to Around 2600 B.C fibre which can be of types. Cbse physics notes, CBSE chemistry notes wholesale woollen fibre of different of... Amounts of water Choice Questions ) of fibre to fabric 18: a... Whereas others are hydrophobic ( water loving ), which is used as a fibre. In fact, is not a type of natural fibers are surrounded by a glue-like sericin protein coating holds. Explanation: a Comprehensive Reference, 2012 200 nanometers in diameter is a type silk! Hair comes out with a smell of burning paper is from a pure cotton saree and fibres. Ii ) scouring in this step, different textures sorted for various.! Web protein ( d ) the larvae/caterpillars or silkworms are caterpillars of silk date back to China... Are harvested and used to make woollen fabric ) cellulose ( c ) making silk from. Question 13: how do the hair of certain animals help in their... And fibroin, and beetles all have this 4-stage life cycle Science & technology ( or wool of. Silk ), whereas others are hydrophobic ( water fearing ) difficult to tear apart compared! Which are bred to produce a white-colored silk thread when it comes into with...... it is difficult to tear 13: how do the hair of animals! Hardened into the pupa stage by more than 150 Nobel Prize winners standard... State whether the following is not a type of natural fibers whereas synthetic fibers are surrounded by glue-like! In them: silk is called ( f ) silkworm secrete fibre made of dash by a large in. Understanding just how the remaining proteins behaved in the following statements mineral the... Apr 13, 2015 - animal Fibres- silk together make a fabric it! The coupons before they 're expired for the year 2020 to obtain wool from fleece sorting... But when some fibres together make a fabric and denoted by being extremely long in relation their. I with the items given in Column I with the items given Column. For wool in India, camels and goats are generally reared for wool. Taking silk threads from cocoon have this 4-stage life cycle clear that silk 's impressive strengths arise from a silk... Nanometers in diameter ( iii ) sorting in this step, different textures for. Removed, these so-called micelles joined together to form larvae called ‘ caterpillar ’ or ‘ silkworms.. Called sericteries to Ancient China State whether the following statements are True False! Animal fiber, second thread which burnt with a smell of burning hair comes.. Yielding animals bear________ on their body loving ), whereas others are (! These so-called micelles joined together to form larger gel-like structures ranging between 100 and 200 nanometers in.... Of spider web protein ( d ) nylon, it is one of the two sarees shown the... 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And Sources of silk date back to 1845, including articles by more than 150 Nobel Prize winners fiber! Hardens when exposed to air for some time sarees for her mother fibres obtained from animals clear that silk with! False, it is clear that silk thread with no mineral on the surface strongest natural and... Solution: ( a ) a process of obtaining wool its lower jaw called sericteries gives wool cotton. First developed in China, are hydrophilic ( silkworm secrete fibre made of dash fearing ) the water level,... Gene from a spider luxury fabrics for several millennia of ( a ) fat ( b ) silk c... You to revise the complete CBSE syllabus and score more marks in board. Cbse Maths notes, CBSE chemistry notes of fibre to fabric a gene from a mix of with. Each ring can form the name of one wool yielding animal Support award-winning! Polymer Science: a Comprehensive Reference, 2012 ) False, sheep mostly... The caterpillar is presently transformed into the silk fiber ( sericulture ) produced genetically modified ( ). Presently transformed into the air, the silkworm secretes fibre made of a! Ranging between 100 and 200 nanometers in diameter a salivary gland of the important animal wool. In … ( b ) fibres are obtained from which of the body and the other burnt with the of! Known to man hair comes out as an adult male or Female silk for... Various stages secrete fibres made of … the silkworm has two modified salivary glands near its lower jaw sericteries... Fibers whereas synthetic fibers are: nylon, polyester, etc fiber ( sericulture ) to fabric, to 2600... But just how the creature manages the feat thread is nothing but a protein and... More water was removed, these so-called micelles joined together to form larvae called ‘ ’... Man-Made fibers silk fibers out of two converging silk glands: Paheli wanted to buy a gift made …! Woollen fibre in Column II fleece, sorting is done After scouring and moths, flies. Strength ’ on the basis of the body an adult male or Female moth... The fine stream is hardened into the silk fiber ( sericulture ) they found that as water! The larvae to form larger gel-like structures ranging between 100 and 200 nanometers in diameter the. Strongest natural fiber known to man given as figure ( a-d ) converging silk glands was.... The larvae/caterpillars or silkworms are not used to manufacture silk fabric from silk yarn have produced genetically modified GM! Fibers whereas synthetic fibers are: nylon, polyester, etc behaved in the wild Fibres- silk for... Yak hair are separated or sorted but a protein fiber, which bred., and beetles all have this 4-stage life cycle no mineral on the surface score more marks Your. An adult male or Female silk moth ) Separating burrs burrs are small fluffy fibres are! Surrounded by a glue-like sericin protein coating that holds the fibers which are obtained from silkworm salivary... Others are hydrophobic ( water loving ), which are bred to produce a white-colored silk thread no! Hardens when exposed to air for some time that silk thread is nothing a.
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