(b) … Question 3  How will you distinguish between natural and artificial silk? Answer: (a) Plant fibers are obtained from cotton and jute . The silkworms enclose themselves completely inside the silken cocoons in two or three days. Artificial silk is obtained from wood pulp and it is made up of modified plant material ‘cellulose’. Cotton . 2. Differentiate between the eri silk and other types of silk. Then it swings its head from side to side in the form of figure of eight. g) Polyester is a natural fibre. Wool, cotton, silk and jute are … Filed Under: Class 7, Fibre to Fabric, Science Tagged With: artificial silk, cocoon, life history of silk moth, mulberry silk, natural silk, production of silk, pupa, rayon, Rearing of Silkworms, reeling, sericulture, silk, silk yarn, silkworm, varieties of silk. Examples: cotton, jute, silk, wool. Question 11 What are the different varieties of silk? Answer: Jute fibres are obtained from the stems of the jute plant. You have read in Class VII that silk fibre obtained from silkworm was discovered ... Mark ( ) the correct answer: Rayon is different from synthetic fibres because (a) it has a silk like appearance (b) it is obtained from wood pulp (c) its fibres can also be woven like those of natural fibres. The cotton fibre is obtained from the fruit of the cotton plant known as cotton balls. Hot water makes the silk fibres of cocoons to separate out. The silkworms are fed mulberry leaves. The soft looking silk yarn is as strong as a comparable thread of steel. The silkworm continues to develop in the form of pupa inside the cocoon to form the silk moth. Answer (d) Question 6 . 4. The fibres are very fine and lustrous, about 10μm(0.0004in)in diameter. Answer-wool, silk. Your email address will not be published. Cocoons are collected and kept under the sun, or boiled, or exposed to steam. Question: Write a caption for each of the figures given as figure (a-d). Answer: Nylon and polyester are synthetic fibre. Silk fibre made of How silk is made from silkworm yak How does sericulture done what isrearing 1.What changes take place in the Pupa stage of silkworm? The pile of cocoons is placed in hot water. The adult female silk moth then lays more eggs. Silk fibres are converted into silk yarn which is used for making silk cloth. Question 4: From which parts of the plant cotton and jute are obtained? f) Silk fibre is obtained from the stem of a plant g) Polyester is a natural fibre. Question 5 What is a cocoon? Question 17. C) Protein done clear. How is it done? 3. polyster is a natural fibre please answer correct to be the brainilest if you will answer wrong god will punish you Your email address will not be published. Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. Wiki User Answered . Pupa is a stage in the life history of silk moth when the caterpillar (or silkworm) becomes ‘encased’ in a hard shell of silk fibres called cocoon. Wool fibre cannot be obtained from which of the following? Question 5 Name two items that are made from coconut fibre. Silk is a natural fibre which is obtained from an insect (called silk moth). Silk is formed in liquid form in the two glands in the silkworms’s head. In order to produce silk, the silkworm developing inside the cocoon (as pupa) is not allowed to mature into an adult silk moth. Silk fibre is obtained from (a) fleece of sheep (b) cotton ball (c) cocoon (d) shiny jute stalk. 1. silk fibre is obtained from the stem of a plant. She has started this educational website with the mindset of spreading Free Education to everyone. Answer: Natural Fibres: wool, cotton, … Required fields are marked *, The rearing of silkworms for obtaining silk is called, The larva (or caterpillar) of a silk moth which produces silk is called. The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. Explanation: a)& b) Process of making yarn from fibres is called spinning. Answer: The rearing of silkworms for obtaining … Artificial silk (called rayon) is obtained from wood pulp and it is made of modified plant material ‘cellulose. Answer: Jute fibre is obtained from jute plant by the following steps: Retting: Jute fibre is obtained from the stalks of the jute plant. After 25-30 days, the silkworms stop eating and get ready to spin cocoons. Question 6 Explain the process of making yarn from fibre. Answer: Cotton is obtained from the fruits of the cotton plant, called cotton balls. D) Sugars done clear. Question 8: Name wool-yielding animals other than sheep. Fill in the blanks with appropriate words: (a) … Silk fibre is obtained from (a) fleece of sheep (b) cotton ball (c) cocoon (d) shiny jute stalk . Silk fibre is made of a protein. Answer: The next stage of caterpillar in the life cycle of silk moth is called pupa. The eggs are then warmed to a suitable temperature for hatching. Sericulture is a very old and common occupation in India, producing silk on a commercial basis. In order to obtain silk, mulberry trees are cultivated, silkworms are reared and their cocoons are collected to get silk fibres. The process of taking out silk fibres from the cocoons for use as silk is called reeling. Natural silk is an animal fibre. Question 6 Describe the life history of silk moth? Silk is a fine, strong, soft and shining fibre produced by silkworms in making their cocoons. material ‘cellulose. What is the nature of silk fibre obtained from the cocoon of mulberry silk moth? Other types of silk including the muga silk, tussar silk and kosa silk, are also present. Q4. All the cocoons are collected at one place. (Paper is also made of cellulose obtained from wood pulp). Answer: Natural silk is obtained from the cocoons of silkworms and it is made up of a protein. Synthetic fibre: The fibre which are synthesized in industry from simple chemicals obtained from petroleum are called synthetic fibre. The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori reared in captivity, This site is using cookies under cookie policy. What is sericulture? Question 18. Examples of natural fibers are cotton and silk whereas examples of synthetic fi… Page No 32: Question 6: How is jute fibre made from the jute plant? Previous Next. (1) Rearing of Silkworms to Obtain Cocoons, (2) Processing of Cocoons to Obtain Silk Fibres, (3) Converting Silk Fibres into Silk Cloth. When the eggs hatch, silkworms come out of the eggs. Mulberry silk is soft, lustrous (shiny) and elastic, and can be dyed in beautiful colours Thus. After about 25 to 30 days, the silkworms stop eating and get ready to spin cocoons.The silkworms climb the twigs placed near them and spin cocoons of silk fibres. The larvae of silk moth are called caterpillars or silkworms. is formed in liquid form in the two glands in the silkworms’s head. the most common variety of silk is mulberry silk. The long silk fibres are obtained by unwinding the threads from cocoons. It is the larva (or caterpillar) of a silk moth which produces silk and not the adult silk moth. Q33: Tick the right answer Nylon fibres are used for making Ropes for rock climbing; Parachutes; Socks; All of the above; View Answer. The silkworms eat day and night and grow. What is sericulture? 3. … View Answer. Wool and silk are obtained from animals and cotton and jute are obtained from plants. Silkis a fine, strong, soft and shining fibre produced by silkworms in making their cocoons. no it is not correct silk is obtained from cocoons FALSE, The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. Question 2 What are the characteristics of silk fibres obtained from the cocoons of  silk moth? The silk yarn is then woven on looms into silk cloth by the weavers. You can specify conditions of storing and accessing cookies in your browser, Silk fiber is obtained from the stem of a plant ( True/False)​, the groundwater provides _ for the surface water​, where does the car gets energy from ? In this way, the life history of silk moth is completed. Egg——> Larva(caterpillar) ——> Pupa ——> Silk moth. The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori reared in captivity _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Hope it helps you ✌ The most common silk moth is the mulberry silk moth. The fibers which are obtained from plants and animals are known as natural fibers whereas synthetic fibers are man-made fibers. Question 17. Differentiate between the eri silk and other types of silk. As soon as the cocoon is formed it is used to obtain silk. Answer: Ropes and jute bags. The rearing of silkworms, processing of cocoons to obtain silk fibres and making of silk fabrics (silk cloth) from silk fibres. (b) Animals fibers are silk and wool . Silk fibre is made of a protein. Last Updated on March 20, 2019 By Mrs Shilpi Nagpal Leave a Comment. mention any two. Nylon and polyester on the … Answer: Ropes; Mats; Question: Explain the process of making yam … What is the nature of silk fibre obtained from the cocoon of mulberry silk moth? The silkworms are fed cut-up mulberry leaves. Answer: It is soft, lustrous and elastic. B) Fat done clear. Answer: The next stage of caterpillar in the life cycle of silk moth is called pupa. Silk fibre obtained from silk moth is_____ A) Carbohydrate done clear. The cocoons are then unwrapped to get silk fibre, which is then woven into fabric. These silks are obtained from cocoons spun by the silkworms of different types of silk moths. Ans : Fibres that are obtained from nature, i.e., from plants and animals are called natural fibres and those made by humans by chemical methods are known as synthetic fibres. wool, silk; Fibre to Fabric – Question: From which part of the plant cotton and jute are obtained? The rearing of silkworms for obtaining silk is called Sericulture. Question 9 Name the tree whose leaves provide food for the silkworms? This breaking of cocoon causes damage to its silk threads and hence lowers the quality of silk. Some of the silkworms (as pupae) are allowed to live and mature into silk moths so that they can lay eggs to produce more silkworms. The silkworm continues to develop in the form of pupa inside the cocoon to form the silk moth. The cocoon is made by silkworm to protect its development as pupa. 3. Class 7 Science Chapter 3 MCQ (Multiple Choice Questions) of Fibre to Fabric. (2) The eggs hatch to form worm-like larvae. Silk moth is a kind of insect. Natural silk is obtained from the cocoons of silkworms and it is made of a ‘protein’. This is because if the silkworm (as pupa) is allowed to mature into a silk moth, then the fully formed silk moth secretes a liquid to dissolve a part of silk of the cocoon to break it so as to come out of it and fly away. Some of the varieties of silk are : Mulberry silk; Tassar silk ; Mooga silk ; Kosa silk; and Eri silk. So, silk is an animal fibre. 2009-04-29 18:31:44 2009-04-29 18:31:44 . Answer: It is soft, lustrous and elastic. 3. c) We get jute fibres from the outer layer of a stem of the jute plant. f) Silk fibre is obtained from the stem of the plant. Q34: Name the source of natural fibre “cotton”. 2. is a stage in the life history of silk moth when the caterpillar (or silkworm) becomes ‘encased’ in a hard shell of silk fibres called cocoon. mention any two. From which parts of the plant cotton and … Question 18. The soft looking silk yarn is as strong as a comparable thread of steel. The pile of cocoons is used for obtaining silk fibres. What is pupa? What is pupa? The larva (or caterpillar) of a silk moth which produces silk is called silkworm. A material which is composed of thin and continuous strands is known as fiber. Natural silk is an animal fibre. Reeling is done in special machines which unwind the fibres of silk from cocoons. Answer: Cotton – Cotton bolls (from the surface of cotton seeds) (fruit) Jute – Stem; Question: Name two items that are made from coconut fibre. (1) The female silk moth lays eggs on the leaves of a tree (such as mulberry tree). The silky covering spun by the silkworm (or caterpillar) of silk moth is called cocoon. Classify the following fibers as natural or synthetic: nylon, wool, cotton, silk, … There are about 20 sets of MCQ tests, each test containing 5 questions with answers and explanation of answers updated for new academy session 2020-21. So, silk is an animal fibre. carefully on paper strips (or cloth strips) and sold to silkworm farmers. Fill in the blanks: (a) Plant fibres are obtained from____________ and___________ . Q32: Name the fibre having properties similar to that of silk. The larva (or caterpillar) and pupa stages in the life history of a silk moth are totally different in appearance from the adult silk moth. Classify the following fibres as natural or synthetic: nylon, wool, cotton, silk, … Selective breeding is a process of (a) selecting the offsprings with desired properties. Question 5. The cocoons having developing silkworms inside them are used to obtain silk. How is Silk … Silk fibre made of How silk is made from silkworm yak How does sericulture done what isrearing 1.What changes take place in the Pupa stage of silkworm? What are the common health problems found in the people who work in silk industry? When the eggs hatch, silkworms (larvae or caterpillars) come out of eggs. Silk fibres obtained from cocoons are spun (twisted) to form silk threads called silk yarn. Answer: The rearing of silkworms for obtaining … This helps in separating out the silk fibres. Soon the silkworm (or caterpillar) covers itself completely by silk fibres. (Paper is also made of cellulose obtained from wood pulp). During these movements of head, the silkworm secretes silk in liquid form through the tiny opening in its head which solidifies on exposure to air and becomes a silk fibre (or silk thread). The silk produced by the silkworms of different varieties of silk moths is different in texture (coarse, smooth, shiny, etc.). Jute fibre is obtained from the stem of the jute plant. (a) Goat (b) Llama (c) Alpaca (d) Moth . A female silk moth lays hundreds of eggs at a time.The eggs of silk moths are stored. Animal fibre: Silk and wool are animal fibre. View Answer. NCERT Solutions for Class 10 हिन्दी – क्षितिज – Chapter 3 – सवैया, कवित्त – देव, NCERT Solutions for Class 10 हिन्दी – क्षितिज – Chapter 2 – राम लक्ष्मण परशुराम संवाद, NCERT Solutions for Class 10 हिन्दी – क्षितिज – Chapter 1 – पद, Economics Chapter 5 Consumer Rights – Notes & Study Material, Economics Chapter 4 Globalisation and The Indian Economy – Notes & Study Material. Answer (c) Question 5. Mulberry silk moth is the most common type, and the fibre obtained from it is lustrous, soft, elastic, and can be dyed with different colours. Silk fibres are obtained from silkworms. The process by which silk thread is separated from the cocoon is called reeling the silk. Jute fibre is obtained from the stem of the jute plant. 2. Answer– True (d) Silk fibre is obtained from the stem of a plant. Answer: a) True b) False c) False d) True e) True f) False g) False. Question 7 Describe how silk is produced? After harvesting, the stalks of … (4) When the pupa (encased in cocoon) develops fully to form an adult silk moth, then the cocoon splits up and a beautiful silk moth comes out. Silk fibre is obtained at which of the following stage of its life cycle? Plant Fibre: Cotton and jute are plant fibre. A fiber can be of two types: natural fiber and synthetic fiber. The silk obtained from the cocoons of mulberry silk moth is called mulberry silk. The farmers keep these eggs at suitable temperature and humidity under hygienic conditions. Top Answer. In India, cotton is … Silk fibres are converted into silk yarn which is used f… fibres and the developing silkworm (as pupa) gets killed. 4. (a) Goat (b) Llama (c) Alpaca (d) Moth Solution: (d) Different wool … Wool fibre cannot be obtained from which of the following? Cocoonis a protective case of silk or similar fibrous material spun by the larvae of moths and certain other insects as a cover for the pupa. Examples: Nylon, Acrylic, Polyester. Silk is a natural fibre which is obtained from an insect (called silk moth). Answer-False (d) Polyester is a natural fibre. What are the common health problems found in the people who work in silk industry? name the fibre of which a cocoon is made? Answer: … Solution: (c) Silk is a natural fibre which is obtained from the cocoons of silk moths. Hence, they are natural fibres. 2.jute is the outer covering of coconut. big in size. Fill in the blanks:- ️ (a) Plant fibres are obtained from _____ and _____. The silkworms feed on the leaves of mulberry tree and grow bigger in size. Answer-False Q3. Question 7: From which part of the plant jute and cotton are obtained? Question 4 What is meant by reeling the silk? Answer: Yarn is a kind of long … The cocoon is made of a thread of raw silk from 300to about 900m(1,000to3,000ft)long. Answer: Wool can be obtained … How is Silk … The silk moth passes through a worm-like stage called ‘larva’ or caterpillar’ (which is also called silkworm) and an encased form called pupa’ during its development between the hatching of egg and formation of adult silk moth. Thank You......​. Answer 4: Cotton is obtained from the fruits of the cotton plant, called cotton balls. nylon, wool, cotton, silk, polyester, jute. Answer– cotton plants, jute (b) Animals fibres are _____ and _____. 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Converted into silk cloth ) from silk moth causes damage to its silk threads and hence lowers the of... Similar to that of silk moth is called reeling the silk leaves provide food for silkworms... The developing silkworm ( or caterpillar ) —— > pupa —— > silk moth is called pupa its from... Of synthetic fi… silk fibres from the cocoon of mulberry silk water makes silk! Fibres obtained from cocoons are spun ( twisted ) to form silk threads called moth...

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