(b) Name the disease that workers may at risk. S CIENCE 24 Fibre to Fabric 3 I n Class VI you have learnt about some fibres obtained from plants. Question 16. (a) fleece of sheep The larvae of silk moth are called caterpillar or silkworm. Question 4. The main aim to rear the sheep is to obtain wool. Question 5. Write the difference between natural silk and artificial silk. ... of sheep or yak. So, as soon as the cocoon is formed, it is used to obtain silk fibres and the developing silkworm (as pupa) gets killed. Answer: (a) Eggs of silk moth … Step III (a) Goat (b) Llama (c) Alpaca (d) Moth . Question 8. Why caterpillars need to shed their skin when they grow bigger but humans do not? For what purpose, rearing of sheep is done? The maximum length of continuous silk thread that can be obtained from a cocoon is more than that of 1000 feet (1000 to 1500 feet) continuous in length. Answer: (d) production of sarees . Wool is obtained from the hair or fleece of animals such as sheep and goat. (c) What values are shown by Neha’s mother? In which part, the wool yielding animals liama and alpaca are found? It leads to a fatal blood disease called sorter’s disease. [NCERT Exemplar] The fleece (or hair) of sheep provides woollen fibres. (d) silviculture The female silk moth lays eggs on mulberry leaves. Handmade Felted Goods [Please click on the pictures above to see more information] Thank you very much for visiting our website. Match Column I with Column II. (a) removal of fleece, Question 8. Name the four given fibres marked 1,2, 3 and 4. (c) Neha’s mother is intelligent and knowledgeable. Egg ➝ Larva (or caterpillar) ➝ Pupa ➝ Silk moth which actually makes the silk fibre? Lohi and nali are breeds of So, a piece of woollen fabric also burns giving the smell of burning hair. (c) washing of sheep fibre to remove grease Answer: The fleece of sheep is not the only source of wool. Which variety of silk is most common and how it is obtained? Wool is obtained from hairs of sheep, yak, camel, goat, etc. Shearing The process of removal of the fleece from an animal is called shearing. To get silk thread, we have to dip cocoon in hot water to get silk thread which is wrapped over the cocoon. The silk obtained from the cocoons of mulberry silk moth is called mulberry silk. They warm them to a suitable temperature for the larvae to hatch from egg. Silk fibres come from cocoons of the silk moth.. iii. Question 5. (d) the process of taking silk threads from cocoon, Question 10. Answer: Answer: You also learnt that wool and silk fibres are obtained from animals. A fibre is a hair-like strand of material. It comes from the coccon of silk worm and requires a great deal of handling and processing, which makes it one of the most expensive fibers also. From which parts of plants cotton and jute are obtained? Answer: The most common silk moth is the mulberry silk moth. To which class, animal fibre or plant fibre, artificial silk belongs to? The rearing of silkworms for obtaining silk is called [NCERT Exemplar] Answer. The natural fleece or hair of sheep (or goat) is white, brown or black in colour. Answer: 3. → Wool is derived from these hairy fibres. [HOTS] The general process that takes place at a sheep shearing shed is (a) a process of making silk reels Pure silk is obtained from the cocoons of silkworm and it is made up of protein. Yak wool is common in the hilly regions of Ladakh. Answer: 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. Name them. 4. As a result, natural silk is costly. Answer: The hair of sheep grow again before the onset of winter and protect them in cold weather. Wool fibre cannot be obtained from which of the following? Answer: Answer: Animals that yield wool Answer: Answers: Yak hair are not used to make woollen fabric. True, Question 7. (b) rearing of silkworm, Question 9. Wool is mainly obtained by shearing fleece from living animals, but pelts of slaughtered sheep are sometimes treated to loosen the fibre, yielding an inferior type called pulled wool. Wool comes mostly from sheep. The shearing (cutting the hair) of sheep is done in hot weather of summer so that sheep may survive without their protective coat of hair. hair, Question 4. In the process of obtaining wool from fleece, sorting is done after scouring. [HOTS] Answer: Write a caption for each of the figures given as figure (a-d). Now-a-days scouring is done by machines. Answer: → Wool is obtained from the fleece (hair) of fleece sheep or yak. After 25-30 days, the silkworms stop eating and start spinning the cocoons. The fleece of sheep (or cut hair of sheep) contains dust, dirt, dried sweat and grease, etc. Answer: Finally, we conclude that the sheep’s hair is sheared off from the body, scoured, sorted, dyed, combed and spun to obtain wool (for knitting sweaters) and woollen yarn (for weaving cloth). Describe the life history of silk moth with the help of figures of various stages. The short woollen fibres are spun into fine yarn and then woven on a loom to make woollen clothes (like shawls, etc). Answer: Question 9. (b) The people who do the job of sorting, sometimes, get infected by the bacteria called anthrax which cause a deadly blood disease called sorter’s disease. One thread burnt with a smell of burning hair and the other burnt with the smell of burning paper. Match the items of Column I with the items given in Column I [NCERT Exemplar], Answers: (a) removal of fleece Angora wool is obtained from angora goats. Question 14. Write the maximum length of continuous silk thread that can be obtained from a cocoon. Wool is the fiber derived from the fur of animals of the Caprinae family, principally sheep, but the hair of certain species of other mammals such as goats, alpacas, and rabbits may also be called wool.. Alpaca. Answer: The wool which is used for knitting sweaters or for weaving shawls is the finished product of a long process. Paper is made of cellulose obtained from wood pulp. The silk fibres separate out. Fibre (marked 1) which is used in filling quilts is cotton and fibre (marked 2) is jute. Name the goats which are found in Tibet and Ladakh. Then, it swings its head from side to side. Answer: Silk fibres come from cocoons of the silk moth. Fibres can be spun into yarn and made into fabric. In Tibet and Ladakh, angora goats are found. To scour is to wash thoroughly. Sheep are usually shorn annually in the spring/summer months. Different types of silk are mulberry silk, tassar silk, mooga silk and kosa silk. Answer: The eggs are hatched into very small larvae within a week. Answer: The fleece of sheep is not the only source of wool. The resulting fibre is known as raw silk. Answer: [NCERT Exemplar] (a) Goat (b) Llama (c) Alpaca (d) Moth Answer: (d) Moth. From what type of health problems the workers suffered while working in a wool industry? Answer: Answer: Answer: (b) rearing of silkworm. The angora rabbit yields best variety of wool Cl2 + 2NaI = 2NaCl + I2, What is the positive charge on the nucleus of an atom due to?, quationshand awnie solids areExplain whybrittlesake the modulo. (b) Fibres are taken out from the cocoon. Wool yielding animals bear …….. on their body. Answer: The general process that takes place at a sheep shearing shed is (a) removal of fleece. (a) Neha’s mother took a thread of natural silk fabric and another thread of artificial silk fabric and burn them separately. Cotton and paper both are carbohydrates. cocoons, moth, Question 3. (c) making silk fabric from silk yarn Answer: Wool is obtained from the fleece or hair of sheep. The silkworms feed on the leaves of mulberry tree and grow bigger in size. (d) Moth silk, Question 3. How do the hair of certain animals help in keeping their bodies warm? True. This covering is known as cocoon. Apart from sheep, wool also comes from the angora goat, yak, llama, alpaca, and even camels. Answer: False, yak hair are used to make woollen fabric. (d) The larvae/caterpillars or silkworms are kept in clean trays along with freshly chopped mulberry leaves. Radhika wanted to buy a silk frock and went to the market with her mother. cocoons, Question 8. The correct order is (c) protein, Question 1 . Question 3. Answer: Answer: Answer: The people who do the job of sorting (separating) the fleece of sheep into fibres of different qualities are called sorters. What term is used for the following process? cocoons, Question 7. Answer. Silk is obtained after killing silkworm, Animal fur cap is obtained from fur which requires the killing of an animal. The rearing of silkworms for obtaining silk is called silviculture. Paheli went to the market to buy sarees for her mother. Question 1. 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. So, the sheared hair of sheep are thoroughly cleaned by washing with soap (or detergent) and a lot of water in tanks. How? Name some fibres obtained from animals; Wool and silk. A) done clear. (a)-(iii); (b)-(iv); (c)-(i); (d)-(ii). Wool is obtained from the fleece (hair) of sheep or yak.. ii. 8. Answer: Natural silk is obtained from the cocoons of silkworms and it is made up of a protein. You also learnt that wool and silk fibres are obtained from animals. n Class VI you have learnt about some fibres obtained from plants. Burn them separately and observe the smell produced. So, on burning these threads, a smell of burning hair comes out. Mulberry silk is soft, lustrous (shiny) and elastic and can be dyed in beautiful colours. A leather jacket is obtained from the skin of animals which needs killing of animals. Sheep are herbivores, so which type of feed (or food) is provided by shepherds? It is used to make very high quality knitwear. False, because mooga is the strongest variety of silk. During the feeding period, a silkworm sleeps four times (24 h each time) at intervals of six days. Answer (d) Question 6. [HOTS] The cocoons are collected and boiled in water to kill the insect inside them. The covering of silk fibres inside which the caterpillar covers itself is called cocoon. (a) Woollen shawl, Question 4. → Wool is obtained from the fleece (hair) of fleece sheep or yak. acids and bases, Question 10. [HOTS] (c) Mooga silk This is how silk was discovered by chance. Question 22. From the given options choose the animal from which fleece cannot be obtained – sheep, goat, yak, cow; Cow. Answer: Answer: Artificial silk is obtained from wood pulp and it is made of modified plant material ‘cellulose’. Question 12. Question 3. The silk obtained from the cocoons of mulberry silk moth is called mulberry silk. (c) cocoon, Question 5. Answer: Answer: The first step is shearing then scouring. Silk fibre belongs to which class of organic substance? Therefore, the wool obtained is understood as fleece. Reeling the Silk Out of these, two fibres (1 and 2) are obtained from plants and other two (3 and 4) fibres are obtained from animals. (c) selecting an area for breeding Answer: 5. Write a short note on how first silk industry began in China. Silk fibre is obtained from [NCERT Exemplar] (a) fleece of sheep (b) cotton ball (c) cocoon (d) shiny jute stalk Answer: (c) cocoon. You must be familiar with the following nursery rhymes: (i) ‘Baa baa black sheep, have you any wool.’ [Value Based Question] Shearing does not hurt the sheep because the uppermost layer of the skin of sheep is ‘dead’. 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Answer: Thus, tassar silk, kosa silk, mooga silk, etc are obtained from cocoons spun by different types of moths. Wool industry is an important source of livelihood for many people in our country. False, because silkworms feed on mulberry leaves. The quality of woollen cloth depends on the breed of sheep from which wool is obtained. There are following two types of fibres that form the hair to sheep. Development of Cocoon. The thread which burns giving a smell of burning paper will be artificial silk thread. Silk is obtained by killing the pupae. 24, Question 11. Step V Ajay is worried about his father’s health. Question 2. Solution: Down (D) 1. (f) Cocoons are kept under the sun or boiled in water. Question 9. Question 6. You also learnt that wool and silk fibres are obtained from animals. The thread which burns giving a smell a burning paper will be an artificial silk. Such as yak wool is common in Tibet and Ladakh. The empress found white worms eating up mulberry leaves. Reeling is done in special machines. True. Answer: Answer: From Cocoon to Silk (ii) The hair on a sheep's body is called fleece, (iii) Silk fabric was first developed in ancient China. Question 18. Answer: Wool and silk fibres are obtained from: (a) plants (b) animals (c) plants and animals (d) all of these. The hair of the sheep are shaved off by using a saving machine similar to that used by barbers. The process of taking out threads from the cocoon for use as silk is called reeling the silk. Neha went to the market with her mother to buy a silk saree for her grandmother. high, Question 9. Silk, wool, Question 2. All these animals have a thick coat of hair or fleece, which keeps them warm. The process of breeding of selective parents for obtaining special characters in their offspring such as soft under hair in sheep, is termed as selective breeding. The long woollen fibres are spun (or twisted) into thick yarn called wool which is used for knitting sweaters, etc. Explain. 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. 3. 4. Define the statement. Answer: False, it is sericulture. (c) sericulture, Question 2. Question 16. [NCERT Exemplar] Mention other sources of wool than sheep. The fur (hair) on the body of camels is also used as wool like Llama and Alpaca. Wool is the natural highly crimped textile fiber obtained from a variety of sheep. Mohair Shawls. Wool is obtained from the fleece (hair) of sheep or yak. The process of separating the fleece of a sheep into sections according to the quality of woollen fibres (such as fine, coarse, long, short, etc) is called sorting. The small fluffy fibres, called burrs, are picked out from the hair (burrs are soft, fluffy fibres in wool). China, Question 14. Silk fibres come from cocoons of the silk moth. Answer. (c) Ajay is very caring, intelligent and sensible boy. Answer: Yak wool provides more warmth than sheep wool. Write the name of the animal from which wool for pashmina shawls is obtained. Do you have any idea? Answer (c) Question 5. Question 27: Explain the formation of silk fibre during the pupa stage of the life cycle of the insect. [NCERT Exemplar] of silk moth. (c) What values are shown by Ajay? A) Shaving done clear. Write the above steps in the correct sequence in which they are carried out. Selective breeding is a process of 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). …….. is the largest producer of silk. Answer: (b) separating hair of different textures The stage next to caterpillar in the life cycle of silk moth is called pupa. i. (b) Yes, pure silk saree is more costly than an artificial one. 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 Liama and alpaca are found in South America. fleece. Define the term ‘selective breeding’. Soon the silkworm (or caterpillar) covers itself by silk fibres and turns into pupa. Artificial silk is a plant fibre. (c) Animal fur cap Answer: Silk fibres come from of silk …….. [NCERT Exemplar] [NCERT Exemplar; HOTS] Answer: During these movement of head, the silkworm secrets fibre made of protein which hardens on exposure to air and becomes silk fibre (or silk thread). (d) Moth wool is obtained from which body part of sheep? (c) Alpaca The main difference between Wool and Silk is that the Wool is a natural fibre from the soft hair of sheep or other mammals and fine, lustrous, natural fiber produced by the larvae of various silk moths, especially the species Bombyx mori The process of taking out threads from the cocoons for use as silk is called reeling the silk. Name the most common silk moth. Answer: protein, Question 1. Name the stage next to caterpillar in the life cycle of silk moth. 2. (d) rolling of sheep fibre into yarn The term sericulture is used for [NCERT Exemplar] The larvae are kept in clean bamboo trays along with young and freshly chopped mulberry leaves. Answer: Question 8. Four different types of fibres are given to us. (d) shiny jute stalk Fibre is a long thread like structure. 2. The silk fibres separate out. (a) Mulberry silk Rampur bushair and Bakharwal are the breeds of which animal-sheep or goat? [Value Based Question] The most common variety of silk is mulberry silk. (c) protein (a) Eggs are warmed to a suitable temperature for the larvae to hatch from eggs. Answer: Silk (78% protein) is much stiffer than wool in spite of both being proteins made from amino acids chains. The pupa is the caterpillar completely covered in silk fibres. Find out. Answer: Question 8. Question 3. Silk yarn of different textures can be prepared. Silk and wool are two fibres which are made up of proteins. The most common silk moth is the mulberry silk moth. Ajay’s father works in a wool industry. The fleece of the sheep along with thin layer of skin is removed from the body. The finest wool is obtained from Merino sheep. Question 11. Question 8. It comes from the fleece/hair of wool yielding animals such as sheep, goat, yak, camel, rabbit, etc. (a) Goat Cocoon is used to obtain silk thread. Question 7. The same quality wool obtained are then mixed together. Angora is the soft white hair of Angora Rabbit. …… and ……. Which thread is from a pure cotton saree and which one from a pure silk saree? tensile strength. Answer: Silkworm feeds on oak leaves. Answer: Answer: 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. ... Shearing is the process in which fleece of sheep with thin layer is removed. 4. (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? After the final moulting begins, the last feeding period (of about ten days) after which the worm grows to its full size. Wool fibre cannot be obtained from which of the following? Wool fibre cannot be obtained from which of the following? Synthetic silk can be prepared at a large scale in factories/mills. The quality and quantity of wool depend upon the ……… of the sheep. There they found that the artificial (synthetic) silk was much cheaper and wanted to know why? Answer: Their food also contain a mixture of pulses, corn, jowar, oil cakes (material left after taking out oil from seeds) and minerals. Question 6. (d) Moth, Question 6. The process of taking out fibres from the cocoon for use as silk is known as reeling the silk. Question 14. Pure and Artificial Silk larvae, Question 6. Sheep are commonly shorn for his or her fleece once or twice a year. It is a natural silk and is an animal fibre. Animal fibres → Wool and silk fibres are obtained from animals. Fig. (i) Silk is a cellulosic fiber. (c) making silk fabric from silk … (d) Cocoon with developing moth. (b) silk Reeling of silk is (e) Female silk moths lay eggs. According to an old Chinese legend, the empress Si-lung-Chi was asked by the emperor Huang-ti to find the cause of the damaged leaves of mulberry trees growing in their garden. He advised his father to take care of their health and told him about the occupational hazards. Steps for the production of silk are given below in a jumbled order. ), a by-product employed in cosmetics and ointments. (c) washing of sheep fibre to remove grease. Silk fibres come from cocoons of the silk moth. [NCERT Exemplar] [NCERT Exemplar] The silkworm continues to develop in the form of pupa inside the cocoon to form the silk moth. Wool is obtained from this fleece. A ……. In his line of work, he does the job of sorting the fleece of sheep into fibres of different qualities. 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. People working in the wool industry sometimes get infected by a bacterium called anthrax, during the sorting (separating) the fleece of sheep into fibres of different qualities. Fibre to Fabric Q1. (b) separating hair of different textures. Explain the phrase – ‘Unity is Strength’ on the basis of the making of fabric from fibre. [NCERT Exemplar] The white woollen fibre obtained by sorting can be dyed in different colours.
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