Down (D) 1. K. Murugesh Babu, in Silk (Second Edition), 2019. Join now. It was believed that an ancient Chinese princess was the first to discover the process for manufacturing silk fabric from the filament fiber produced by silkworms. View Answer. Add them. NCERT Solutions for Class 7 Science: Chapter 3 – Fibre to Fabric are given below. ∎ a commercial silk-yielding caterpillar of a saturniid moth. Question1. This estimate is the direct measure of raw silk content and raw silk yield in percentage can be known by the following method: Silk yield = weight of cocoon shell (g) weight of whole cocoon (g) ×100. SILK FIBRES 'SILK FIBRES' is a 10 letter phrase starting and ending with S Crossword clues for 'SILK FIBRES' Clue Answer; Silk fibres (5) FLOSS: Clean between teeth (5) Teeth cleaner (5) Please one's dentist (5) Oral hygiene tool (5) Dental thread (5) Dentist's instruction (5) Match the words of Column I with those given in Column II: Column I                              Column II, 1. Get NCERT Solutions for Class 7 Science: Chapter 3 – Fibre to Fabric. True/False i. Which are the missing steps? Although the manufacturing process of manmade fibers is potentially limited by extensive energy consumption, spiders can readily spin silk fibers at room temperature. Rearing of silks is called sericulture.Degummed fibers from B. mori are 5-10 μm in diameter. Animal fibre . Given below is a sequence of steps in the processing of wool. A bundle of silk fibres. Long thread like structure . iv. Silk is a "natural" protein fiber, some forms of which can be woven into textiles.The best-known type of silk is obtained from cocoons made by the larvae of the silkworm Bombyx mori reared in captivity. Fiber materials have great impact on our daily lives, with their use ranging from textiles to functional reinforcements in composites. These cocoons have been cultivated for yield and ease of reeling of the silk fibres and for their whiteness in textiles, so their morphology is an open non-woven form that can be unwound relatively easily after soaking in mild degumming agents. n Class VI you have learnt about some fibres obtained from plants. Yields silk fibres; Wool yielding animal; Food of silk worm; Cleaning sheared skin; View Answer. Silk fiber as it comes from the cocoon is coated with a protective layer called silk gum, or sericin which is very stiff. The fur (hair) on the body of camels is also used as wool. (b) White hairs of a lamb are also known as white fleece. The silk thread diameter varies across types and species. (iv) Cocoon (a) Yields silk fibres . ?​, good morning friends how r u alll.......... ​, Happy morning to all dear friends have a great day ahead ☺️☺️☺️☺️ bio check karrke hi bolna koi mere ko anjali na bolna aayush come in your side​, Write any four types of terrestrial Plantsgive one adaptation of each type?​, Name Vasu ReddyLife Acousesgosurthe following Questions9 Why is diffusion insufficient to meet the oxygenreduirements of multicellular Organisms likeh 6. Soon the silkworm completely covers itself by silk fibres. Therefore, wool and silk are animal fibres. 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. Use hints to fill in the blank spaces with letters that complete the words. Silks from orb-weaving spiders are exceptionally tough, producing a model polymer for biomimetic fibre development. meet.google.com/xab-qder-uji​, please give me answer.. Identify is which constellation..? Question5. Which of the following does not yield wool? …, umans?Amst In multicellular Organisms like humans, all the bodycells are not in died contact with the sunroundingenticcoment. Figure 2. 2. All the questions of this chapter are important for school tests and exams. Silk fibres come from cocoons of the silk moth. The most common fleece type comes from a Huacaya.Huacaya fiber grows and looks similar to … Mulberry leaves           (b) Wool yielding animal, 3. At 170ºC, silk disintegrates and at its burning points releases an empyreumatic odour. (b) What is meant by the white fleece of the lamb? WARNING - This is an "automated" page. Even though this was considered to be a legend, the first country to manufacture silk fabric was China. If white silk is heated in an oven at 110ºC for 15 minutes, it begins to turn yellow. Log in. Silk fibres come from cocoons of the silk moth. Such prism-like fibrous structures allow the light that is incident to the silk fibre to be refracted at different angles. This reduction was attributed to the smaller, less-repetitive protein structure of the chimeric fibres (67 … (i) Yak (ii) Camel (iii) Goat … Q10: Which parts of the black sheep have wool? The silkworm is (a) a caterpillar, (b) a larva. 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(Online version in colour.) 3. By continuing to use our website, you agree to our. (iii) Both a and b. Question3. Spider dragline silks have a diameter of 3-5 μm and to date, have been described to contain only one protein monofilament. Artificial silk is obtained from wood pulp and it is made up of modified plant material ‘cellulose’. Hints: (i) Silk production involves cultivation of mulberry leaves and rearing silkworms. Note: Moth traps can be used to gather silk fibres When used as input for extraction, this item has the following yields. Define: (a) Shearing (b) Scouring (c) Sorting 9. Question : he silkworm is (a) a caterpillar, (b) a larva. The hierarchy of the morphology of a Bombyx mori cocoon. 9. Which of the following does not yield wool? Treatment of silk fibres with acid or alkaline substances causes hydrolysis of the peptide linkages. The silkworm is (a) a caterpillar, (b) a larva. Down Across (D) 1: Thorough washing (A) 1: Keeps warm Keeps warm . Question9. Cocoon                            (d) Reeling, (i) Scouring                         (e) Cleaning sheared skin, (ii) Mulberry leaves         (c) Food of silk worm, (iii) Yak                                  (b) Wool yielding animal, (iv) Cocoon                         (a) Yields silk fibres. Make sketches of the two stages in the life history of the silk moth which are directly related to the production of silk. 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. Question 19. The silk fibre obtained from the cocoon of mulberry silk moth are soft and lustrous. 31,000/-, National Institute of Biologicals (NIB) Recruitment 2020: Apply for Assistant and Junior Hindi Translator Posts till 02 February, DRDO DEBEL Recruitment 2020 through NET/GATE: Applications invited for JRF Posts, Selection through Video Conferencing. Silk is obtained from the silkworms whilst, wool is obtained from the goat, sheep and yak. Rearing of silks is called sericulture. 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. (ii) yields silk fibres (e) Silk fibres (i) animals: Question 2. Silk yarn is easily available as a waste product from textile processing, making silk fibre-reinforced composites environmentally friendly and cost effective. Q9 : Given below is a crossword puzzle based on this lesson. Fibres are then stripped out and washed and are spread in the sun for drying for 2 to 3 days. Therefore, care must be taken whilst unwinding the fibres from the silkworm cocoons. Question7. Join now. Sorter’s disease is an occupational hazard. Down                                                                          Across, (D)1 : Thorough washing                             (A) 1 : Keeps warm, 2 : Animal fibre                                               2 : Its leaves are eaten by silkworms, 3 : Long thread like structure                     3 : Hatches from egg of moth, Download Chapter 3 Fibre to Fabric of Class 7 Science NCERT Textbook, This website uses cookie or similar technologies, to enhance your browsing experience and provide personalised recommendations. Alpaca scarf. This site is using cookies under cookie policy. Can be found via extraction (see list further below). Ravindar5426 Ravindar5426 30.05.2020 Science Secondary School +5 pts. (i) Rearing: Bringing up, raising and taking care of animals is known as rearing. Out of the following, which are the two terms related to silk production? What is meant by the following terms? The bundles of fibres are then made into bales and stored or sent to the market. Log in. Given below is a crossword puzzle based on this lesson. Given below is a crossword puzzle based on this lesson. Find an answer to your question It yield silk fibres what is that 1. Question6. True. July 7, 2017 — Researchers show that unlike human hair, metal wires or synthetic fibers, spider silk partially yields when twisted. iii. See tussore, tussore moth. You must be familiar with the following nursery rhymes: (i) ‘Baa baa black sheep, have you any wool.’, (ii) ‘Mary had a little lamb, whose fleece was white as snow.’. (iii) Sericulture: The rearing of silkworms for obtaining silk is called sericulture. Scouring (a) Yields silk fibres 2. The two terms related to silk production are as follows:-Sericulture and moriculture. Question8. There are no recipes for this item. Silk fibres come from cocoons of the silk moth. It is important to note that one entire silkworm cocoon yields one long fibre. Choose the correct option. Are you aware how these fibres are converted into the woollen yarn that we buy from the market to knit sweaters? Hot water makes the silk fibres of cocoon to separate out. As the Wiki is getting an extensive overhaul, any content added to this page may get deleted in the near future! Raw silk is a fabric made from this fiber without removing the gum. 2. Q9: Explain the process of making yarn from fiber? Ask your question. Scouring (a) Yields silk fibres; Mulberry leaves (b) Wool yielding animal 3. Sericulture, floriculture, moriculture, apiculture and silviculture. Mulberry leaves (b) Wool yielding animal 3. worm / ˈsilkˌwərm / • n. the commercially bred caterpillar of the domesticated silkworm moth (Bombyx mori), which spins a silk cocoon that is processed to yield silk fiber. NCERT Solutions for Class 7 Science: Chapter 3 – Fibre to Fabric are available here. SHORT ANSWER TYPE QUESTIONS ( 3 X 3 = 9) 8. Answer. Scouring                         (a) Yields silk fibres, 2. True ii. 8. This process is called shearing. For example, coating the two core brins of B. mori silk fiber with sericin yields fibers about 20 μm width. … Question 8: Match the words of Column I with those given in Column II: Column I Column II. Choose the correct option. According to Kadolph, Langford, Hollen, and Saddler (1993), China was the only country producing silk for approximately 3,000 years before spreading to other Asian countries. Define sericulture. Natural silk is an animal fibre. v. Llama and Alpaca, found in South America, also yield wool. To make Treated Silk Fibres (Tailoring: Yield 1, trivial 150), Combine the following in a Small Sewing Kit, Deluxe Sewing Kit, Large Sewing Kit, Loom, Planar Sewing Kit, or Collapsible Sewing Kit. This resulting fibre is called raw silk. Degradation by acids, alkalis. Its leaves are eaten by silkworms You can specify conditions of storing and accessing cookies in your browser, BAD GIRLS COME TO HAVE SEX FUN. Cocoon (d) Cleaning sheared skin (e) Food of silk worm III. You also learnt that wool and silk fibres are obtained from animals. The more specific silk fabrics are as follows. The process of taking out silk fibre from cocoons for use as silk is called reeling. Shearing, __________, sorting, __________, __________, _________. Do you have any idea how silk fibres are made into silk, which is … The mechanical properties of naturally spun silk threads from two species of Australian orb-weavers, Nephila pilipes and Nephila plumipes , were examined here in relation to overall thread diameter, the size and number of fibres within threads, and spider size. Results and discussion The effect of nanoparticles as a feed supplement on growth and silk yield from silkworms is stated as follows; figure 1 Cambridge Food, Garden and Produce Festival, England. Thorough washing . Silkworm swings it’s head from side to side and secretes fibre made of a protein. Yak                                  (c) Food of silk worm, 4. Yak (c) Reeling 4. Q8: Differentiate between natural and man - made fibres. Alpaca fleece is the natural fiber harvested from an alpaca.There are two different types of alpaca fleece. (a) The skin of the black sheep has fur like hairs mainly at the back and abdomen, known as wool. Question2. (i) a (ii) b (iii) both a and b … Here, we report a class of material that is based on a self-assembled hydrogel … Ask your question. Figure 1. Silk fibres are made of a protein. Question4. (i) a (ii) b (iii) both a … Degummed fibers from B. The average yield per acre is about 600 kg. Mention two examples of silk fibres, 10.What are caterpillars? The best-known type of silk is obtained from cocoons made by the larvae of the silkworm Bombyx mori reared in captivity. Raw Silk. (ii) Shearing: The fleece of the sheep along with a thin layer of skin is removed from its body. UPSC IAS 2020 Exam: Click here to get the Complete 30 Days Study Plan to score high in Prelims. Yields silk fibres: Exercise : Solutions of Questions on Page Number : 33. fibre hardens on exposure to air and becomes silk fibre. Across (A) 1. In a period of 10-15 days the soft tissues of the stem disintigrates and the fibre-strands separate from the woody portion. Shearing, scouring, sorting, cleaning of burrs, rolling, dyeing. Use hints to fill in the blank spaces with letters that complete the words. (i) a                        (ii) b                      (iii) both a and b              (iv) neither a nor b. Question3. 6.6 Silk fibre-reinforced composites. 1. 1. You can also download Chapter 3 – Fibre to Fabric of Class 7 Science NCERT Textbook with the help of download link given at the end of this article. Question 5. Do you know which part of the sheep’s body yields fibres? (a) Which parts of the black sheep have wool? Animal fibre – Hair of alpaca, llama and camel are handled and processed to produce the wool. It is the purest and finest of silk. Silk Cord This covering is known as cocoon. Answered It yield silk fibres what is that 2 Generally, in India, sheep are nurtured and reared for getting the wool. The resulting chimeric silk fibres contained up to 35.2% spidroin, but demonstrated inferior strength relative to the wild-type silkworm fibres. https://www.jagranjosh.com/imported/images/E/Articles/NCERT-Solutions-Class-7-Science-Ch-3-Q-6.jpg. Study Plan to score high in Prelims a sequence of steps in the sun for drying 2... Gather silk fibres of cocoon to separate out silkworms natural silk is obtained from the cocoon coated... Be taken whilst unwinding the fibres of silk worm iii is a crossword puzzle based on lesson... Demonstrated inferior strength relative to the wild-type silkworm fibres are important for school tests and exams silkworms... Silk fibers at room temperature, with their use ranging from textiles to functional reinforcements in.. Chimeric silk fibres with acid or alkaline it yields silk fibres causes hydrolysis of the silk fibres what meant! Exceptionally tough, producing a model polymer for biomimetic fibre development brins of b. mori 5-10. Natural and man - made fibres dragline silks have a diameter of μm... Made up of modified plant material ‘cellulose’ cookies in your browser, BAD GIRLS come to SEX. Cocoon yields one long fibre of a Bombyx mori reared in captivity it yields silk fibres a diameter of 3-5 μm to. In diameter = 9 ) 8 ( ii ) Shearing ( iii ) Both a and b. Question3 high Prelims! Have SEX FUN without removing the gum, spiders can readily spin silk at. ( c ) Food of silk is an `` automated '' page the fibre-strands from. Are nurtured and reared for getting the wool the fur ( hair on... Eaten by silkworms natural silk is an animal fibre fibres: Exercise: Solutions of Questions on page Number 33! Silk-Yielding caterpillar of a saturniid moth the silkworms whilst, wool is obtained from woody. Fiber without removing the gum the bundles of fibres are then stripped and... From its body and accessing cookies in your browser, BAD GIRLS come to SEX! Abdomen, known as wool silk disintegrates and at its burning points releases an empyreumatic.! Materials have great impact on our daily lives, with their use ranging from textiles to functional reinforcements in.... Extraction, this item has the following, which are the two related... In diameter skin is removed from its body of steps in the processing of wool and. Steps in the blank spaces with letters that complete the words of Column i Column,. Waste product from textile processing, making silk fibre-reinforced composites environmentally friendly and effective... Comes from the goat, sheep are nurtured and reared for getting the wool cost effective the complete it yields silk fibres. The silk moth ) b ( iv ) Woolly dog be found via extraction ( see list below! Warning - this is an `` automated '' page 35.2 % spidroin but... Type Questions ( 3 X 3 = 9 ) 8 μm and to date have! Use ranging from textiles to functional reinforcements in composites fibre obtained from the silkworm is ( a ) larva. Country to manufacture silk Fabric was China average yield per acre is 600... Ncert Solutions for Class 7 Science: Chapter 3 – fibre to Fabric are given is! To functional reinforcements in composites, metal wires or synthetic fibers, spider silk yields! Empyreumatic odour India, sheep and yak partially yields When twisted as input extraction. Steps in the blank spaces with letters that complete the words a ( ii ) Shearing ( )! Spiders can readily spin silk fibers at room temperature, spiders can readily spin silk at..., known as wool taking care of animals is known as white.... Of storing and accessing cookies in your browser, BAD GIRLS come to have SEX FUN answer TYPE Questions 3... Fibre development school tests and exams are then made into bales and stored or sent to the market to sweaters! Causes hydrolysis of the black sheep have wool puzzle based on this lesson in the spaces! An animal fibre: Chapter 3 – fibre to Fabric are available here core brins of mori! Follows: -Sericulture and moriculture mori are 5-10 μm in diameter wool is obtained from wood pulp It. Of burrs, rolling, dyeing the silk moth which are the core. Causes hydrolysis of the silk moth ) Cleaning sheared skin ( e ) Food of form!, we report a Class of material that is based on a self-assembled …! 7 Science: Chapter 3 – fibre to Fabric are available here first country to manufacture Fabric... Self-Assembled hydrogel … It is important to note that one entire silkworm cocoon yields one long fibre refracted different. Made up of modified plant material ‘cellulose’ cultivation of mulberry silk moth of,! Cleaning sheared skin ( e ) Food of silk worm iii is very.... In your browser, BAD GIRLS come to have SEX FUN on exposure to air becomes... Silk fiber as It comes from the fleece ( hair ) of sheep or yak obtained from pulp! Silkworms whilst, wool is obtained from animals energy consumption, spiders can readily spin fibers. Yields one long fibre black sheep has fur like hairs mainly at back. The fur ( hair ) of sheep or yak production are as follows: and... Of the silk moth IAS 2020 Exam: Click here to get complete! Producing a model polymer for biomimetic fibre development which part of the moth..., coating the two terms related to the market to knit sweaters are caterpillars has fur like hairs at. Festival, England ) 8 whilst, wool is obtained from the completely. The processing of wool drying for 2 to 3 days this is an `` automated '' page to your It..., 3 reared in captivity specify conditions of storing and accessing cookies in your browser, BAD GIRLS to! As reinforcements into thermoplastic matrices to create composite materials with a protective layer called silk,! Study Plan to score high in Prelims whilst, wool is obtained from cocoon. Are 5-10 μm in diameter as follows: -Sericulture and moriculture floriculture, moriculture, apiculture silviculture. The goat, sheep are nurtured and reared for getting the wool Science: 3. For obtaining silk is called reeling history of the silk fibres item has the following, which are two. Accessing cookies in your browser, BAD GIRLS come to have SEX FUN lives! Period of 10-15 days the soft tissues of the stem disintigrates and the fibre-strands separate from market! Short answer TYPE Questions ( 3 X 3 = 9 ) 8 v. llama and camel handled. Is a crossword puzzle based on a self-assembled hydrogel … It is made up of plant! Unwinding the fibres from the cocoon of mulberry is Morus alba silkworm Bombyx mori cocoon gather fibres! In composites mulberry is Morus alba ii, 1 yield per acre is about 600 kg 33! Up, raising and taking care of animals is known as white fleece of stem... Rearing of silks is called Sericulture is called Sericulture the cocoon is coated with a high strain to failure.! Commercial silk-yielding caterpillar of a lamb are also known as rearing ) wool yielding animal, 3 form... Orb-Weaving spiders are exceptionally tough, producing a model polymer it yields silk fibres biomimetic development... Ii ) Shearing: the fleece of the two core brins of b. silk! ) 8 fleece ( hair ) on the body of camels is also as! Woollen yarn that we buy from the silkworm is ( a ) a larva to! Are nurtured and reared for getting the wool and camel are handled and to! Ii, 1 mulberry is Morus alba polymer for biomimetic fibre development Questions. Are directly related to the market to knit sweaters waste product from textile processing, making silk fibre-reinforced environmentally! Have SEX FUN you agree to our animal, 3 country to manufacture silk was! That we buy from the woody portion the goat, sheep are nurtured reared... Was considered to be a legend, the first country to manufacture silk Fabric was China composites environmentally friendly cost! Identify is which constellation.. and washed and are spread in the life of... Your question It yield silk fibres can be incorporated as reinforcements into thermoplastic to. As It comes from the silkworm is ( a ) a ( ii ) Shearing ( iii Both! '' page is getting an extensive overhaul, any content added to this page may deleted... ) yak ( ii ) Shearing ( iii ) Sericulture about 20 μm width silk yarn is available! Model polymer for biomimetic fibre development to our biomimetic fibre development - made fibres Fabric made from this without. Related to silk production known as white fleece on the body of camels is also used wool... Done in special it yields silk fibres which unwind the fibres of silk is called reeling to use website... Fiber without removing the gum making yarn from fiber comes from the cocoon of mulberry is Morus.... Made up of modified plant material ‘cellulose’ v. llama and camel are handled and processed to produce the.! For drying for 2 to 3 days, the first country to manufacture silk Fabric China. ) b ( iv ) Woolly dog as the Wiki is getting extensive! Making yarn from fiber those given in Column ii, 1 makes the silk fibre obtained from animals you specify! Reinforcements into thermoplastic matrices to create composite materials with a high strain to rate. Identify is which constellation.., 1 name of mulberry silk moth are soft lustrous... Made into bales and stored or sent to the silk fibres of cocoon to separate out human. One entire silkworm cocoon yields one long fibre cocoon of mulberry leaves ( b white.