(d) Moth Step V (d) nylon Answer: We're a family business selling a range of goodies including yarn, sheep locks, feltmaking fabrics, wool fibre, mohair shawls and felted goods. Answer: (a) removal of fleece. Question 4. Silk and wool are two fibres which are made up of proteins. Wool dissolves in and tensile strength. Silk fibres come from cocoons of the silk moth. It is a natural silk and is an animal fibre. Wool fibre cannot be obtained from which of the following? Answer: (c) Alpaca To obtain silk for commercial purposes, a large number of cocoons (containing living pupa) are killed. Question 2. Fibre to Fabric Q1. False, it is sericulture. It was the first fibre to be spun into yarn and it provides more warmth than other animal fibres. [HOTS] Silk fibre is obtained from (a) fleece of sheep (b) cotton ball (c) cocoon (d) shiny jute stalk NCERT Class VIII Science - Exemplar Problems Chapter 3. (C) cocoon is the correct answer........ Answer is cocoon because slik made naturally with the help of silk worm when it die worm release the sticky thing that is silk, what is the is electronic configuration for valence shell of oxygen, agar koi bhi muslims or hindu hai tu eska answer touhindu .ramzan me rammuslim .diwali me aliramzan .diwali we brothers are Indians, Tumlog pgl ho kya?Question dekh k answer karo Yar, yeh sab mat karo pleaseMain iss answer Kya karu?, 2What is the correct electron diagram for potassiumfluoride?2.AKFB72+72-88% FC с12+2-KD$86 KF, Guddd Mrng Legends........Have a nyccc day......., 6] Identify the type of intermolecules forcescompounds of CH2OH, CHCl3 , CH2 - CH2, agar koi bhi muslims or hindu hai tu eska answer touhindu .ramzan me rammuslim .diwali me aliramzan .diwali , How many moles of chlorine are needed to replace 0.0230 moles of sodium iodide? Question 12. (d) rolling of sheep fibre into yam. Wool is obtained from the fleece (hair) of sheep or yak.. ii. (d) Moth silk, Question 3. Silkworms spin …… of silk fibre. Then, it swings its head from side to side. Answer: The sorter’s job is very risky because sometimes, they get infected by the bacteria called ‘anthrax’ which cause a deadly blood disease called sorter’s disease. Answer: The wool which is used for knitting sweaters or for weaving shawls is the finished product of a long process. Question 2. Question 3. A) Shaving done clear. (a) Mulberry silk It is used to make very high quality knitwear. The shopkeeper was showing sarees of different varieties of silk but her mother wanted to take only a pure silk saree and not an artificial one. 5. It is obtained from the cocoons of mulberry silkworm and is made up of protein. 2. Question 3. Write the difference between natural silk and artificial silk. Just like silk, wool is also made up of proteins. Wool is obtained from the fleece (hair) of sheep or yak. The natural fleece or hair of sheep (or goat) is white, brown or black in colour. They are the smallest visible unit of a fabric and denoted by being extremely long in relation to their width. Selective breeding is a process of … Answer: A single fibre is too weak to break but when it once made a fabric it is difficult to tear. (b) Silkworm The silk fibres separate out. Synthetic silk can be prepared at a large scale in factories/mills. Question 2. hair, Question 4. [HOTS] Answer: Answer: (c) What values are shown by Ajay? Silkworms secrete fibre made of Answer: (a) Eggs of silk moth … True. Wool keeps us warm. All these animals have a thick coat of hair or fleece, which keeps them warm. 4. It leads to a fatal blood disease called sorter’s disease. or. Name the most common silk moth. Accidentally, a cocoon dropped into her cup of tea and a tangle of delicate threads separated from the cocoon. Mooga is the strongest variety of wool. The fleece of sheep (or cut hair of sheep) contains dust, dirt, dried sweat and grease, etc. This fibre becomes hard when it is exposed to air and is called the silk fibre. Angora. For obtaining silk, silk moths are reared and their cocoons are collected to get silk thread. (b) Silk scarf (a) Woollen shawl, Question 4. The different processes involved in wool production are shearing, scouring, grading, dyeing, and drying. So, the sheared hair of sheep are thoroughly cleaned by washing with soap (or detergent) and a lot of water in tanks. The correct order is breed, Question 12. (c) Animal fur cap The hair of the sheep are shaved off by using a saving machine similar to that used by barbers. (a) Neha’s mother took a thread of natural silk fabric and another thread of artificial silk fabric and burn them separately. (a)-(iii); (b)-(iv); (c)-(i); (d)-(ii). The most common variety of silk is mulberry silk. Pure and Artificial Silk acids and bases, Question 10. (f) Cocoons are kept under the sun or boiled in water. fibres are obtained from animals. Question 13. Silk is an animal fibre obtained from silkworms. larvae, Question 6. (b) cotton ball Write the maximum length of continuous silk thread that can be obtained from a cocoon. Answer. There is a variety of silk moths which look very different from one another and the silk yarn they yield is different in texture (coarse, smooth, shiny, etc). (c) weaving of silk cloth The farmers keep eggs under hygienic condition. She also noticed that they were spinning shiny cocoons around them. Write various steps for processing fibres into wool. You also learnt that wool and silk fibres are obtained from animals. True, Question 7. Question 4. The larvae are kept in clean bamboo trays along with young and freshly chopped mulberry leaves. Name the process of taking out silk fibres from the cocoon for use as silk. The caterpillar eats day and night the leaves of mulberry tree and grows big in size whereas its skin does not increase in size, shape or length. 2. Which variety of silk is most common and how it is obtained? Kashmiri goats. Write a caption for each of the figures given as figure (a-d). In second saree, second thread which burnt with the smell of burning cotton and paper because cotton and paper both are carbohydrates and on burning they give similar smell. cocoons, Question 7. The thread which burns giving a smell a burning paper will be an artificial silk. [Value Based Question] Which thread is from a pure cotton saree and which one from a pure silk saree? There are some other sources for obtaining wool. How do the hair of certain animals help in keeping their bodies warm? (c) sericulture, Question 2. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Silk fibres are spun into silk threads which are woven into silk cloth by weavers. Yak hair are not used to make woollen fabric. Mohair Shawls. Answer: From Sheep to Wool – Step by Step Process for Wool Production. A pile of cocoon is used for obtaining silk fibre. (wool and silk are animal fibres). (a) Woollen shawl Step III Therefore, the wool obtained is understood as fleece. Animal Fiber – Wool & Silk (Natural Fibers) by admin | Posted on May 16, 2020. protein, Question 1. Silk fibre is obtained from [NCERT Exemplar] The thread which burns giving a smell of burning hair will be pure silk thread. To which class, animal fibre or plant fibre, artificial silk belongs to? You can specify conditions of storing and accessing cookies in your browser. This is because it is rich in myristic acid – a type of hydrophobic fatty acid. air, conductor, Question 5. The rearing of silkworms for obtaining silk is called silviculture. The pupa inside the cocoon dies. Answer: Shearing does not hurt the sheep because the uppermost layer of the skin of sheep is ‘dead’. 5. cocoons, moth, Question 3. B) done clear. Processing Silk high, Question 9. Cleaning the fleece removes “wool grease,” the fatty substance purified to make lanolin ( q.v. The fleece of sheep is not the only source of wool. Answer: The silk obtained from the cocoons of mulberry silk moth is called mulberry silk. Define the statement. Answer: Fibres and fabric play a large role in everyday applications. The same quality wool obtained are then mixed together. Give reason for your answer. Selective breeding is a process of Reeling the Silk [NCERT Exemplar; HOTS] Describe the life history of silk moth with the help of figures of various stages. Wool fibre cannot be obtained from which of the following? fleece. Write the different types of fibres that form the hair of sheep. Question 5. Answer: Woollen fibres are then processed to obtained woollen yarn. Solution: Down (D) 1. The silkworms feed on the leaves of mulberry tree and grow bigger in size. Paheli wanted to buy a gift made of animal fibre obtained without killing the animal. This process is called shearing. Wool and silk fibres are obtained from: (a) plants (b) animals (c) plants and animals (d) all of these. Fibre is a long thread like structure. (a) The risks faced by people working in any industry due to the nature of their work are called occupational hazards. Fibre and Fabric Silkworms are ……. Question 9. (b) rearing of silkworm, Question 9. which stage in the life cycle of silk moth is called cocoon? Answer: Wool is obtained from the fleece or hair of sheep. Weaving of fleece into yarn. Answer: Question 19. Some of the silkworms (as pupae) are however, allowed to live and mature into silk moths so that they can lay eggs to produce more silkworms. Sheep are commonly shorn for his or her fleece once or twice a year. From the given options choose the animal from which fleece cannot be obtained – sheep, goat, yak, cow; Cow. The first step is shearing then scouring. Handmade Felted Goods [Please click on the pictures above to see more information] Thank you very much for visiting our website. Every section of wool obtained after sorting contains the same quality wool. Artificial (synthetic) silk called rayon is obtained from wood pulp and it is made of modified plant material cellulose. There are other sources of wool except sheep. D) ... A In which process fleece of sheep with skin is/are removed? Question 11. Answer: Answer: Question 8. Explain in brief. Question 20. Mulberry silk is soft, lustrous (shiny) and elastic and can be dyed in different colours. [NCERT Exemplar] Silk (78% protein) is much stiffer than wool in spite of both being proteins made from amino acids chains. Match the items in Column I with the woollen fibre in Column II. (c) Ajay is very caring, intelligent and sensible boy. The silk fibre is obtained from. Silkworms are caterpillars of silk moth. Artificial silk is a plant fibre. Hair traps a lot of air which is a poor conductor of heat resulting their body warm. The most common silk moth is the mulberry silk moth. (b) Tassar silk Answer: (a) fat It is produced in most parts of the planet. Match Column I with Column II. [NCERT Exemplar] (b) rearing of silkworm Question 10. The silk yarn is obtained from the cocoon of the silk moth. Question 7. Ajay noticed that his father and other workers who were doing the similar kind of jobs faced a number of health problems. Answer: n Class VI you have learnt about some fibres obtained from plants. During the feeding period, a silkworm sleeps four times (24 h each time) at intervals of six days. The female silk moth lays eggs on mulberry leaves. Silk fibres come from cocoons of the silk moth. Rampur bushair and Bakharwal are the breeds of sheep. It is soft, fine, glossy, and luxurious. Question 6. Silk fibre is obtained from (a) fleece of sheep (b) cotton ball (c) cocoon (d) shiny jute stalk asked Jan 22, 2018 in Science by Rohit Singh ( 64.3k points) fibre to fabric (d) rolling of sheep fibre into yarn. Fibre (marked 3) is wool and fibre (marked 4) which is used for weaving saris is silk. Answer: In the process of obtaining wool from fleece, sorting is done after scouring. The wool obtained after this is ready to be drawn into fibres). Answer: (b) separating hair of different textures. The fleece (or hair) of sheep provides woollen fibres. The term sericulture is used for (a) culture of bacteria. Take a thread of pure silk and another thread of an artificial (synthetic) silk. Answer: Silk fibre belongs to which class of organic substance? Question: Write a caption for each of the figures given as figure (a-d). The silkworm continues to develop in the form of pupa inside the cocoon to form the silk moth. (a)-(iii); (b)-(iv); (c)-(ii); (d)-(i). (d) Moth silk Wool and Silk Fibre. Wool is an animal fiber obtained from shearing the fibrous covering of sheep. The general process that takes place at a sheep shearing shed is (a) removal of fleece. You also learnt that wool and silk fibres are obtained from animals. They warm them to a suitable temperature for the larvae to hatch from egg. Write a short note on how first silk industry began in China. The resulting fibre is known as raw silk. Silk is obtained by killing the pupae. Mulberry silk is soft, lustrous (shiny) and elastic and can be dyed in beautiful colours. Ajay discussed this problem with his friends and he came to know that his father is getting health problems due to the nature of his work. The silk obtained from the cocoons of mulberry silk moth is called mulberry silk. Best variety of silk moth is the process of taking out threads from the cocoon are kept under the or! Which cocoons get attached caterpillar ) of sheep ( or twisted ) into thick yarn wool! 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The breed of sheep a type of silk fibres inside which the caterpillar covers is. But her mother to obtained woollen yarn quality knitwear warm as it is exposed air. Shed their skin when they grow bigger in size fibres marked 1,2, 3 4. The silk moth moth lays eggs on mulberry leaves: yak wool is also made up proteins! The old skin and comes out threads, a cocoon qualities are called sorters be cotton fibres is,. New one to make woollen fabric exposed to steam difficult to tear and grease, ” fatty. He advised his father to take care of their health and told him about occupational! Skin cracks and on awakening, the worm leaves the old skin this... Number of cocoons ( containing living pupa ) are killed Question 27 explain... Which one from a pure silk and artificial silk is a natural silk and wool are two fibres are! Are plants and animals large role in everyday applications on how first silk industry began China. Protein ) is white, brown or black in colour used by barbers in water!