[NCERT Exemplar] Apart from sheep, wool also comes from the angora goat, yak, llama, alpaca, and even camels. (a) removal of fleece (c) washing of sheep fibre to remove grease. Reeling the Silk (a) cocoon Answer: Answer: → Wool and silk fibres are obtained from animals. The fleece of sheep is not the only source of wool. (b) Name the disease that workers may at risk. The silk fibres separate out. Question 5. Write a short note on how first silk industry began in China. (b) cotton ball The thread which burns giving a smell of burning paper will be artificial silk thread. Define the statement. Question 4. Answer: Paheli wanted to buy a gift made of animal fibre obtained without killing the animal. (c) making silk fabric from silk yarn 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. Answer: Answers: (b) rearing of silkworm Paper is made of cellulose obtained from wood pulp. Answer: (c) Ajay is very caring, intelligent and sensible boy. Find out. Answer (d) Question 6. 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. In the process of obtaining wool from fleece, sorting is done after scouring. While sleeping, its skin cracks and on awakening, the worm leaves the old skin and comes out in a new one. Silk fibres come from cocoons of the silk moth. Silk fibre is obtained from [NCERT Exemplar] (a) fleece of sheep (b) cotton ball (c) cocoon (d) shiny jute stalk Answer: (c) cocoon. tensile strength. (d) Cocoon with developing moth. Question1. Which of the following would be the right gift for her to buy? Answer: Shearing does not hurt the sheep because the uppermost layer of the skin of sheep is ‘dead’. Alpaca fiber is sourced from alpacas.It is warmer than sheep's wool and lighter in weight. Name different types of silk. Answer: Answer. Answer: Wool fibre cannot be obtained from which of the following? The finest wool is obtained from Merino sheep. (f) Cocoons are kept under the sun or boiled in water. Question 4. 7. Question 13. (a) selecting the offsprings with desired properties Wool is obtained from the fleece (hair) of sheep or yak. A fibre is a hair-like strand of material. (d) Moth silk There are some other sources for obtaining wool. Explain. (d) Moth silk, Question 3. This fibre becomes hard when it is exposed to air and is called the silk fibre. Answer: Animals that yield wool Angora. Answer: Wool is possibly the oldest fiber known to humans. Silk fibres are made up of a ……. Wool and silk are animal fibres. 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). Answer: Answer: Answer: of silk moth. Synthetic silk can be prepared at a large scale in factories/mills. Answer: A single fibre is too weak to break but when it once made a fabric it is difficult to tear. acids and bases, Question 10. Wool and Silk Fibre. Question 8. The silk fibre obtained from the cocoon of mulberry silk moth are soft and lustrous. Answer: Silk fibre is obtained from (a) fleece of sheep (b) cotton ball (c) cocoon (d) shiny jute stalk . Question 16. So, as soon as the cocoon is formed, it is used to obtain silk fibres and the developing silkworm (as pupa) gets killed. NCERT Solutions for Class 7 Science: Chapter 3 – Fibre to Fabric are given below. Silk is a natural fibre obtained from the cocoons of silkworms. fleece. in which part of India, yak wool is common? Answer: The long woollen fibres are spun (or twisted) into thick yarn called wool which is used for knitting sweaters, etc. 3. 2. Weaving of fleece into yarn. Answer: Artificial silk is obtained from wood pulp and it is made up of modified plant material ‘cellulose’. Write the above steps in the correct sequence in which they are carried out. Answer: (a) Eggs of silk moth … Question 11. (g) Fibres are taken out from the cocoon. True. Angora is the soft white hair of Angora Rabbit. The silk yarn is obtained from the cocoon of the silk moth. Silk fibres come from cocoons of the silk moth. (a) culture of bacteria (d) production of sarees . Yak wool is common in Tibet and Ladakh.. iv. Scouring. 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. You must be familiar with the following nursery rhymes: (i) ‘Baa baa black sheep, have you any wool.’ cocoons, Question 8. Solution: The fruits or bolls of cotton plants are used to obtain cotton fibre and jute is obtained from the stems of the jute plants. False, generally sheep are reared. Fibre (marked 3) is wool and fibre (marked 4) which is used for weaving saris is silk. Hair trap a lot of …… which is a poor …… of heat. Name the natural fibre obtained from insects. Silk fibre belongs to which class of organic substance? Fig. The cocoons are collected and boiled in water to kill the insect inside them. (a) fat It leads to a fatal blood disease called sorter’s disease. Question 10. Answer: poor, Question 15. Silk fibres have fine draping qualities and are naturally crease-resistant and bring about a warm feel to the skin. (c) What values are shown by Ajay? Two fibres are made up of proteins. Name some breeds of sheep reared in our country. Question 9. Answer: Life History of Silk Moth Formation of Silkworm Question 2. Name them. Question 13. During the feeding period, a silkworm sleeps four times (24 h each time) at intervals of six days. Values are shown by the stretched-out molecular form the stage next to caterpillar in life! To make lanolin ( q.v shorn for his or her fleece once or twice a year sericulture used... 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