Answer: Cocoon is used to obtain silk thread. Wool keeps us warm. How do the hair of certain animals help in keeping their bodies warm? ... Shearing is the process in which fleece of sheep with thin layer is removed. Fibre (marked 3) is wool and fibre (marked 4) which is used for weaving saris is silk. The rearing of silkworms for obtaining silk is called [NCERT Exemplar] Neha went to the market with her mother to buy a silk saree for her grandmother. → Wool and silk fibres are obtained from animals. (c) Ajay is very caring, intelligent and sensible boy. Thus, tassar silk, kosa silk, mooga silk, etc are obtained from cocoons spun by different types of moths. Answer: (a): Wool can be obtained without killing the animal. She took out a thread from the edge of the two sarees shown by the shopkeeper and burnt them. Wool and Silk Fibre. Paper is made of cellulose obtained from wood pulp. Answer: Answer: Name the goats which are found in Tibet and Ladakh. 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. Accidentally, a cocoon dropped into her cup of tea and a tangle of delicate threads separated from the cocoon. Silkworms spin …… of silk fibre. China, Question 14. Answer: After the final moulting begins, the last feeding period (of about ten days) after which the worm grows to its full size. (b) Silk scarf Name the most common silk moth. You also learnt that wool and silk fibres are obtained from animals. The stage next to caterpillar in the life cycle of silk moth is called pupa. (a) removal of fleece Answer: Wool and silk fibres are obtained from: (a) plants (b) animals (c) plants and animals (d) all of these. The general process that takes place at a sheep shearing shed is: (a) removal of fleece. Answer: False, silk fibre is made up of a protein. Answer: Silk fibres come from cocoons of the silk moth. For obtaining pure silk, we have to rear silk moth, their larvae to get pupa. 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. Fibre and Fabric Question: Write a caption for each of the figures given as figure (a-d). They warm them to a suitable temperature for the larvae to hatch from egg. Answer: The most common silk moth is the mulberry silk moth. Answer. To which class, animal fibre or plant fibre, artificial silk belongs to? (d) rolling of sheep fibre into yam. The process of taking out threads from the cocoon for use as silk is called reeling the silk. Rearing Silkworms Wool industry is an important source of livelihood for many people in our country. (c) washing of sheep fibre to remove grease Question 5. Reeling is done in special machines. For obtaining silk, silk moths are reared and their cocoons are collected to get silk thread. Name some fibres obtained from animals; Wool and silk. Explain in brief. Ajay noticed that his father and other workers who were doing the similar kind of jobs faced a number of health problems. 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. After 25-30 days, the silkworms stop eating and start spinning the cocoons. Take a thread of pure silk and another thread of an artificial (synthetic) silk. To get silk thread, we have to dip cocoon in hot water to get silk thread which is wrapped over the cocoon. Yak hair are not used to make woollen fabric. The small fluffy fibres, called burrs, are picked out from the hair (burrs are soft, fluffy fibres in wool). This site is using cookies under cookie policy. Question 2. (wool and silk are animal fibres). (b) separating hair of different textures. Question 21. (b) Silkworm The people who do the job of sorting (separating) the fleece of sheep into fibres of different qualities are called sorters. Silkworms secrete fibre made of Answer: From the given options choose the animal from which fleece cannot be obtained – sheep, goat, yak, cow; Cow. The fleece of the sheep along with thin layer of skin is removed from the body. The eggs are hatched into very small larvae within a week. Question 13. Answer: Yak wool provides more warmth than sheep wool. Across (A) 1. Answer: Processing of fibres into wool involves the following steps: Step I Kashmiri goats. They are the smallest visible unit of a fabric and denoted by being extremely long in relation to their width. (b) rearing of silkworm Wool comes mostly from sheep. Answer: True. From Sheep to Wool – Step by Step Process for Wool Production. Silk is a natural carbohydrate fibre. The larva (or caterpillar) of a silk moth makes the silk fibre. The female silk moth lays eggs on mulberry leaves. Question 21. The resulting fibre is known as raw silk. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. … (c) After 25 to 30 days, the caterpillers stop N eating and start spinning cocoons. [NCERT Exemplar] (a) Goat (b) Llama (c) Alpaca (d) Moth Answer: (d) Moth. Step VI (cotton and jute are plant fibres). (a) Woollen shawl (f) Cocoons are kept under the sun or boiled in water. (a)-(iii); (b)-(iv); (c)-(ii); (d)-(i). Question 13. The quality of woollen cloth depends on the breed of sheep from which wool is obtained. Ajay is worried about his father’s health. This is how silk was discovered by chance. The short woollen fibres are spun into fine yarn and then woven on a loom to make woollen clothes (like shawls, etc). Question 3. (c) Alpaca Wool is obtained from the fleece or hair of sheep. You also learnt that wool and silk fibres are obtained from animals. Answer: Answer: Name the natural fibre obtained from insects. Burn them separately and observe the smell produced. False, yak hair are used to make woollen fabric. Answer: The different processes involved in wool production are shearing, scouring, grading, dyeing, and drying. Alpaca fiber is sourced from alpacas.It is warmer than sheep's wool and lighter in weight. Artificial silk is obtained from wood pulp and it is made of modified plant material ‘cellulose’. [HOTS] Reeling the Silk After scouring, sorting is done. 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: The term sericulture is used for (a) culture of bacteria. The thread which burns giving a smell of burning hair will be natural silk (or pure silk). Rampur bushair and Bakharwal are the breeds of which animal-sheep or goat? Question 4. acids and bases, Question 10. (c) Mooga silk (a) Eggs are warmed to a suitable temperature for the larvae to hatch from eggs. Silk is a …… conductor of heat. (d) Moth silk, Question 3. Answer: [HOTS] The larvae are kept in clean bamboo trays along with young and freshly chopped mulberry leaves. Animals that yield wool (c) making silk fabric from silk … In Tibet and Ladakh, angora goats are found. fleece. (c) washing of sheep fibre to remove grease. (a) selecting the offsprings with desired properties Find out. Animal fibres → Wool and silk fibres are obtained from animals. The silkworms feed on the leaves of mulberry tree and grow bigger in size. Answer: The hair of the sheep are shaved off by using a saving machine similar to that used by barbers. Name some wool yielding animals. This fibre becomes hard when it is exposed to air and is called the silk fibre. Wool is the natural highly crimped textile fiber obtained from a variety of sheep. 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. Explain. Weaving of fleece into yarn. (b) selecting the parents with desired properties, Question 7. Question 6. Handmade Felted Goods [Please click on the pictures above to see more information] Thank you very much for visiting our website. (d) The larvae/caterpillars or silkworms are kept in clean trays along with freshly chopped mulberry leaves. Question 7. 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. Question 20. It is obtained from the cocoons of mulberry silkworm and is made up of protein. (c) Neha’s mother is intelligent and knowledgeable. Answer. Question 16. Answer: All these animals have a thick coat of hair or fleece, which keeps them warm. 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. Wool yielding animals are sheep, yak, llama, alpaca, angora goat, angora rabbit and camel. (c) making silk fabric from silk yarn In the life history of silk moth as Answer: (a)-(iii); (b)-(i); (c)-(ii); (d)-(iv), RD Sharma Class 11 Solutions Free PDF Download, NCERT Solutions for Class 12 Computer Science (Python), NCERT Solutions for Class 12 Computer Science (C++), NCERT Solutions for Class 12 Business Studies, NCERT Solutions for Class 12 Micro Economics, NCERT Solutions for Class 12 Macro Economics, NCERT Solutions for Class 12 Entrepreneurship, NCERT Solutions for Class 12 Political Science, NCERT Solutions for Class 11 Computer Science (Python), NCERT Solutions for Class 11 Business Studies, NCERT Solutions for Class 11 Entrepreneurship, NCERT Solutions for Class 11 Political Science, NCERT Solutions for Class 11 Indian Economic Development, NCERT Solutions for Class 10 Social Science, NCERT Solutions For Class 10 Hindi Sanchayan, NCERT Solutions For Class 10 Hindi Sparsh, NCERT Solutions For Class 10 Hindi Kshitiz, NCERT Solutions For Class 10 Hindi Kritika, NCERT Solutions for Class 10 Foundation of Information Technology, NCERT Solutions for Class 9 Social Science, NCERT Solutions for Class 9 Foundation of IT, PS Verma and VK Agarwal Biology Class 9 Solutions, NCERT Solutions for Class 10 Science Chapter 1, NCERT Solutions for Class 10 Science Chapter 2, Periodic Classification of Elements Class 10, NCERT Solutions for Class 10 Science Chapter 7, NCERT Solutions for Class 10 Science Chapter 8, NCERT Solutions for Class 10 Science Chapter 9, NCERT Solutions for Class 10 Science Chapter 10, NCERT Solutions for Class 10 Science Chapter 11, NCERT Solutions for Class 10 Science Chapter 12, NCERT Solutions for Class 10 Science Chapter 13, NCERT Solutions for Class 10 Science Chapter 14, NCERT Solutions for Class 10 Science Chapter 15, NCERT Solutions for Class 10 Science Chapter 16, CBSE Previous Year Question Papers Class 12, CBSE Previous Year Question Papers Class 10. It is produced in most parts of the planet. Answer: It leads to a fatal blood disease called sorter’s disease. [NCERT Exemplar] Answer: While sleeping, its skin cracks and on awakening, the worm leaves the old skin and comes out in a new one. Egg ➝ Larva (or caterpillar) ➝ Pupa ➝ Silk moth which actually makes the silk fibre? larvae, Question 6. NCERT Solutions for Class 7 Science: Chapter 3 – Fibre to Fabric are given below. (a) culture of bacteria The larvae of silk moth are called caterpillar or silkworm. (ii) The hair on a sheep's body is called fleece, (iii) Silk fabric was first developed in ancient China. The correct order is Question 8. Question 22. Silk fibres come from cocoons of the silk moth. False, because mooga is the strongest variety of silk. Question 7. (b) rearing of silkworm. Wool is obtained from the fleece (hair) of sheep or yak. Answer: Such as yak wool is common in Tibet and Ladakh. or. Thus, tassar silk, mooga silk, kosa silk, etc are obtained from cocoons spun by different types of moths. So, a piece of woollen fabric also burns giving the smell of burning hair. [NCERT Exemplar] Question 1. Pure silk is obtained from the cocoons of silkworm and it is made up of protein. Wool → Wool comes from sheep, goat, yak and some other animals who are having hair on their body. Write a caption for each of the figures given as figure (a-d). Silk fibre is obtained from [NCERT Exemplar] (a) fleece of sheep (b) cotton ball (c) cocoon (d) shiny jute stalk Answer: (c) cocoon. Answer: So, on burning these threads, a smell of burning hair comes out. (a) Goat 8. Question 1. The same quality wool obtained are then mixed together. When the silkworm (or caterpillar) is ready to enter the next stage of its development called pupa, it first weaves a net to hold itself. Answer: (a) Goat (b) Llama (c) Alpaca (d) Moth . You must be familiar with the following nursery rhymes: (i) ‘Baa baa black sheep, have you any wool.’ (a) fat Sorter’s disease is an occupational hazard. 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. [NCERT Exemplar] 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. (d) production of sarees . Ajay’s father works in a wool industry. Silkworm feeds on oak leaves. Wool is obtained from the fleece (hair) of sheep or yak. Answer (c) Question 5. There they found that the artificial (synthetic) silk was much cheaper and wanted to know why? Silk yarn of different textures can be prepared. Answer: Silk fibre is obtained from (a) fleece of sheep (b) cotton ball (c) cocoon (d) shiny jute stalk . Wool fibre cannot be obtained from which of the following? Answer: The first step is shearing then scouring. A fibre is a hair-like strand of material. Synthetic silk can be prepared at a large scale in factories/mills. Silk and wool are two fibres which are made up of proteins. It was the first fibre to be spun into yarn and it provides more warmth than other animal fibres. (c) sericulture, Question 2. Answer: 5. From what type of health problems the workers suffered while working in a wool industry? Question 6. Silk is an animal fibre obtained from silkworms. (b) silk How silkworms are reared? The eggs are stored carefully on strips of paper or cloth and sold to silkworm farmers. Question 4. Angora is the soft white hair of Angora Rabbit. Fill in the blanks. S CIENCE 24 Fibre to Fabric 3 I n Class VI you have learnt about some fibres obtained from plants. Step III When combined with its property of trapping air helps to keep the person warmer than sheep wool. Natural silk is obtained from the cocoons of silkworms and it is made up of a protein. Silk is obtained by killing the pupae. The main aim to rear the sheep is to obtain wool. Silk – derived from silkworms (the fibre is obtained from the cocoon of the silkworm) Cashmere – derived from the fur of the Cashmere goat Shearling – derived from the fur and skin of the shearling sheep Persian wool – derived from the fur of Karakul lambs (regarded by many to … Answer: Silk (78% protein) is much stiffer than wool in spite of both being proteins made from amino acids chains. (a) Eggs of silk moth on mulberry leaves Hair trap a lot of …… which is a poor …… of heat. (c) weaving of silk cloth Question 5. This process is called shearing. 3. (a) cocoon (f) Cocoons are kept under the sun or boiled in water. Write the difference between natural silk and artificial silk. 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 Neha was confused that how to distinguish between a pure silk and an artificial silk saree. There are some other sources for obtaining wool. As a result, natural silk is costly. Name the sources of obtaining fibres. The white woollen fibre obtained by sorting can be dyed in different colours. Explain the quality of wool they provide and the state where they are found. Question 3. Explain the phrase – ‘Unity is Strength’ on the basis of the making of fabric from fibre. Silk fibres are obtained from silkworms. Answer: Question 15. From which parts of plants cotton and jute are obtained? Write the above steps in the correct sequence in which they are carried out. Question 6. Protein. 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Acid – a type of silk moth animal fibres: cocoons, moth, their larvae to silk... Soft wool obtained is understood as fleece, so which type of silk fibre their health and him! Herbivores, so which type of silk fibres come from cocoons spun by different types silk. 3. in which they are carried out weak to break but when is! The workers suffered while working in a wool industry VI you have learnt some!
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