It was believed that an ancient Chinese princess was the first to discover the process for manufacturing silk fabric from the filament fiber produced by silkworms. Question 12. Then it swings its head from side to side in the form of figure of eight. 4. High-quality silk is a fabric that has been manufactured for thousands of years and has maintained its reputation as a symbol of luxury. carefully on paper strips (or cloth strips) and sold to silkworm farmers. Mulberry silk is soft, lustrous (shiny) and elastic, and can be dyed in beautiful colours Thus. Wool is obtained from the fur of animals like sheep, yak etc. f) Silk fibre is obtained from the stem of a plant g) Polyester is a natural fibre. Sericulture Sericulture means ‘silk farming’. B) Cotton done clear. Spinning is the process of making yarn. 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. b) Spinning is a process of making fibres. 15. The cocoons are then unwrapped to get silk fibre, which is then woven into fabric. Q2. material ‘cellulose. Hence, it is preferred for making parachutes. Soon the silkworm (or caterpillar) covers itself by silk fibres and turns into pupa. d) The process of removing seed from cotton is called ginning. Make sketches of the two stages in the life history of the silk moth which are directly related to the production of silk. The soft looking silk yarn is as strong as a comparable thread of steel. (Paper is also made of cellulose obtained from wood pulp). Even though this was considered to be a legend, the first country to manufacture silk fabric was China. In the next step, these fibres are then spun into threads. There he found a fabric which was smooth to touch, had vibrant colour and shine. The caterpillar secretes fibre made of a protein, soon the caterpillar completely covers itself by silk fibres and turns into pupa. D. Silk fibres are converted into silk yarn which is used for making silk cloth. (1) The female silk moth lays eggs on the leaves of a tree (such as mulberry tree). done clear. Silk fabric is made from a natural fibre produced from silkworms, popularly mulberry silk. f) Silk fibre is obtained from the stem of a plant. Silk is obtained from the cocoon of silk worms. insect fiber that is spun by a silkworm to make its cocoon; the fiber reflects light and has insulating properties. A) Wool done clear. Silk fibre is made of a protein. Boojho wants to make yarn from fibre at home. As a adjective silk is made … The cocoons having developing silkworms inside them are used to obtain silk. asked 1 hour ago in Polymer Chemistry by Pahi (43.5k points) Which of the following fibres is considered as the strongest natural fibre? The silkworm continues to develop in the form of pupa inside the cocoon to form the silk moth. Thanks for visiting our website. Synthetic fibres – fibre forming material is made from simpler substances. Which of the following is not a natural fibre? She has started this educational website with the mindset of spreading Free Education to everyone. The long silk fibres are obtained by unwinding the threads from cocoons. The most common silk moth is the mulberry silk moth. Silk fibres are converted into silk yarn which is used for making silk cloth. A female silk moth lays hundreds of eggs at a time.The eggs of silk moths are stored. Soon the silkworm (or caterpillar) covers itself completely by silk fibres. The commercial and industrial possibilities of spider silk are not yet fully explored. (3) 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. For this, the cocoons are either boiled, steamed or treated in an oven. The rearing of silkworms for obtaining silk is called sericulture. Because of its high cost, it finds very limited use in textiles. Silk is obtained from the cocoon of silk worms. The silk fibers spun by the spider is said to be as strong or even stronger than steel and very elastic. This means that the average silk fiber is longer than the silk thread that is wound on a spool of sewing silk. Though silk can be hand-washed, dry-cleaning will increase the life and beauty of the fiber. This is a golden yellow silk produced by strong silk fibers made from the silk worm Antheraea assamensis found in Assam state in India. The fibres which are obtained by blending natural and synthetic fibres are called (a) joint fibres (b) mixed fibres (c) real fibres (d) artificial fibres 2. Sea silk. All right reserved. This covering is known as cocoon. The silkworms are fed cut-up mulberry leaves. As a natural protein fiber silk has a significant attraction towards natural dyes. For handicrafts and items like parachutes, bicycle tyres, comforter filling and artillery gunpowder bags. (C) Alpaca. 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. 12. asked 1 hour ago in Polymer Chemistry by Pahi (43.5k points) Which of the following fibres is considered as the strongest natural fibre? Silk fibre is obtained at which of the following stage of its life cycle? What is Silk Fiber in Textile? Can you tell why? 1. g) Polyester is a natural fibre. A synthetic fiber which looks like silk is obtained by chemical treatment of wood pulp. A) Wool worms. This covering is known as cocoon. So, silk is an animal fibre. (a) Cotton (b) Jute (c) Silk (d) Wool. Write the names of the fibres. Silk is both softer than human hair but as strong as wire. are also made from nylon fibers because of its strength. Silk is formed in liquid form in the two glands in the silkworms’s head. Make sketches of the two stages in the life history of the silk moth which are directly related to the production of silk. How is it done? State whether the following statements are true or false: a) Yarn is made from fibres. Make a list of the four chemical bases and put each fiber into its proper category. (a) Cotton (b) Jute (c) Nylon (d) Flax; Which set of substances is not used for making fibres? Silk is the strongest natural fibre. Which of the following fibres is considered as the strongest natural fibre? B) Carbon compounds. Question1. e) Weaving of yarn makes a piece of fabric. Your email address will not be published. The pile of cocoons is used for obtaining silk fibres. Its fibres can be woven like those of natural fibres. The silkworms enclose themselves completely inside the silken cocoons in two or three days. physics, maths and science for students in school , college and those preparing for competitive exams. Reeling is done in special machines which unwind the fibres of silk from cocoons. D) done clear. Uses of pure silk are decreasing gradually due to its high cost value and costly maintenance. The silkworm continues to develop in the form of pupa inside the cocoon to form the silk moth. Answer 6 Question 7. Q2. The strongest engineering materials often incorporate fibers, for example carbon fiber and ultra-high-molecular-weight polyethylene.. Like wool fiber, silk fiber is an animal fiber. Lotus silk, a natural flower fiber, is rare & highly exclusive fiber. (a) Silk, chemicals (b) Yak hair, camel hair (c) Husk, bones (d) Flax, wool Solution: (c) Husk and bones are not used for making fibres. But instead of being grown in the form of hair, it is produced by insects as a handy material with which to build their webs, cacoons and climbing ropes. Silk with all of its gum is termed raw silk. The soft looking silk yarn is as strong as a comparable thread of steel. Asbestos. This is a golden yellow silk produced by strong silk fibers made from the silk worm Antheraea assamensis found in Assam state in India. The next step is reeling or filature. … Silk moth is a kind of insect. c) Jute is the outer covering of coconut. 3 Fibre to Fabric I n Class VI you have learnt about some fibres obtained from plants. C) Linen done clear. the most common variety of silk is mulberry silk. Man made fibres are considered under two main headings. A minor amount of wild tussah silk is produced for specialty items. d) The process of removing seed from cotton is called ginning. Silk is a natural protein fiber produced by silkworms that are kept in captivity. 1 view. View Solution play_arrow; question_answer7) Woollen fibres are obtained from which of the following things? Silk fibres are obtained from silkworms. The fibres in this category may be classified into the following sub groups. Name the process of taking out silk fibres from the cocoon for use as silk. Which of the following is used for making gunny bags? i. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon ii. View Solution play_arrow; question_answer7) Woollen fibres are obtained from which of the following things? g) Polyester is a natural fibre. Name the stage next to caterpillar in the life cycle of silk moth. You must be familiar with the following nursery rhymes: The next step is reeling or filature. Artificial silk (called rayon) is obtained from wood pulp and it is made of modified plant material ‘cellulose. It is composed mainly of fibroin. 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). Given below are the links of some of the reference books for class 7 math. Chapter 3 - Fibre to Fabric. Silk fibers are produced by a variety of animals, but the most widely used silk is made from the cocoon of the Bombyx mori larvae. There he found a fabric which was smooth to touch, had vibrant colour and shine. Silk is a natural protein fiber, some forms of which can be woven into textiles. Which of the following fibres is considered as the strongest natural fibre? Question 11 What are the different varieties of silk? The silkworm continues to develop in the form of pupa inside the cocoon to form the silk moth. done clear. The cocoons are collected and boiled in water to kill the silkworms. (A) Camel. f) Silk fibre is obtained from the stem of a plant. Natural silk is an animal fibre. B) Carbon compounds. NCERT Solution for Class 6 Science. Many people never pass out of this phase. The strongest engineering materials often incorporate fibers, for example carbon fiber and ultra-high-molecular-weight polyethylene.. Most high-quality silk products are made with silk fibres woven in a specific way – with a charmeuse weave. The rearing of silkworms, processing of cocoons to obtain silk fibres and making of silk fabrics (silk cloth) from silk fibres. View Solution play_arrow; ... Fibres made from which of the following is suited to be used in cold places? They never see a flower without wanting to pick it and put it in a vase, they never enjoy a book without wanting to own it, nor a picture without wanting to hang it on their walls. (B) Ilama. The silk yarn (thread) is obtained from the cocoon of the silk … Spider silk. Answer 11 (c) Very Short Answer Questions. Question 17. Silk is a fine, strong, soft and shining fibre produced by silkworms in making their cocoons. Terrycot is made by mixing two types of fibres. State the following statement are true or false a) Yarn is made from fibres b) Spinning is a process of making fibres c) Jute is the outer covering of coconut d) The process of removing seed from cotton is called ginning. Silk is a natural protein fiber excreted by the moth larva Bombyx mori, better known as the common silkworm. Silk is a natural fibre which is obtained from an insect (called silk moth). 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. Other insects can also produce silk. View Solution play_arrow; ... Fibres made from which of the following is suited to be used in cold places? fibres and the developing silkworm (as pupa) gets killed. Last Updated on March 20, 2019 By Mrs Shilpi Nagpal Leave a Comment. Answer: The process of taking out threads from the cocoons for use as silk is called reeling the silk. e) Weaving of yam makes a piece of fabric. D) done clear. Sea silk. It is resistant to dust and moths. Natural silk is obtained from the cocoons of silkworms and it is made of a ‘protein’. The silk worms feed on mulberry leaves and each worm spins a continuous thread, which is nearly 800 meters in length, to make a cocoon. Out of the following, which are the two terms related to silk production? It is, therefore, known as artificial silk. In this way, the life history of silk moth is completed. In the next step, these fibres are then spun into threads. Doctors also use it to make prosthetic arteries. DISCLOSURE: THIS PAGE MAY CONTAIN AFFILIATE LINKS, MEANING I GET A COMMISSION IF YOU DECIDE TO MAKE A PURCHASE THROUGH MY LINKS, AT NO COST TO YOU. (a) Silk, chemicals (b) Yak hair, camel hair (c) Husk, bones (d) Flax, wool; Boojho went to a cloth shop. C. Is a natural fibre. 1. 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 silk obtained from the cocoons of mulberry silk moth is called mulberry silk. State whether the following statements are true or false: a) Yarn is made from fibres. It is obtained from the stems of jute plants (Corchorus). The process where the cotton fibers are drawn out and being twisted. According to Kadolph, Langford, Hollen, and Saddler (1993), China was the only country producing silk for approximately 3,000 years before spreading to other Asian countries. (C) Protein. Has low elasticity. This natural flower fiber is only extracted by a few expert craftspeople Rock wool. (a) Cotton (b) Jute (c) Silk (d) Wool ← Prev Question Next Question → 0 votes . f) Silk fibre … 7. It has a silk like appearance and is chemically identical to Silk. done clear. (a) Silk, chemicals (b) Yak hair, camel hair (c) Husk, bones (d) Flax, wool; Boojho went to a cloth shop. Pure silk fiber has great absorbency, making silk apparel items cool in the summer and warm in the winter. Silk . Filament is a fiber that manufactured is continuous to near continuous lengths for use. When the eggs hatch, silkworms (larvae or caterpillars) come out of eggs. Mineral fibers. Raw silk: Tussah silk: Silk made from wild silkworms is called tussah silk. Substances in options (a), (b) and (d) are used for making fibres. The rearing of silkworms for obtaining silk is called Sericulture. (C) Both 'a' and 'b'. A) done clear. done clear. done clear. Question 5 What is a cocoon? NCERT Solutions for Class 7 Science: Chapter 3 – Fibre to Fabric are given below. 6. c) Jute is the outer covering of coconut. Sericulture is a very old occupation in India. The silk fibre is made up of a protein. As soon as the cocoon is formed it is used to obtain silk. Fibers from plants and animals are constructed directly in nature have very large molecule of polymers. (B) Fat. (a) Cotton (b) Jute (c) Nylon (d) Flax; Which set of substances is not used for making fibres? Fibers are often used in the manufacture of other materials. Question 3  How will you distinguish between natural and artificial silk? All the cocoons are collected at one place. It is a delicate process of extracting silk fibres from the treated cocoons. As nouns the difference between fiber and silk is that fiber is (countable) a single elongated piece of a given material, roughly round in cross-section, often twisted with other fibers to form thread while silk is (uncountable) a fine fiber excreted by the silkworm or other arthropod (such as a spider). D) Silk done clear. Wool. d) The process of removing seed from cotton is called ginning. (a) Cotton (b) Jute (c) Wool (d) Polyster 3. Egg——> Larva(caterpillar) ——> Pupa ——> Silk moth. India produces a lot of silk on a commercial scale. B) done clear. Show the relationship by filling the blanks in the following sentence. e) Weaving of yarn makes a piece of fabric. (a) Cotton (b) Jute (c) Silk (d) Wool ← Prev Question Next Question → 0 votes . 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. Bulk of silk fibres produced is utilised in preparing silk clothes. Wool and silk. Answer 6 Question 7. It has several attributes which set it above other fibers. If we come down to the basics, silk is a natural protein fiber, produced by the larvae of certain specific insects, like caterpillars of moth. Silk from spiders has been seen to possess greater strength and elongation to failure, and this has prompted research into improving the properties of traditional silk for textile applications and also for more technical uses. Which set of substances is not used for making fibres? Silk is neither wrinkle or sun resistant, and over-exposure to sunlightwill weaken and fade the fabric. (D) All of these. Silk fibres are obtained from silkworms. Which of the following makes silk fibres – (a) Larva (b) Adult silk moth (c) Pupa (d) None of the above iii. Fibers are often used in the manufacture of other materials. of the following can provide hair as wool source? b) Spinning is a process of making fibres. PLEASE READ MY DISCLOSURE FOR MORE INFO. Because of its high cost, it finds very limited use in textiles. High-quality silk is a fabric that has been manufactured for thousands of years and has maintained its reputation as a symbol of luxury. is formed in liquid form in the two glands in the silkworms’s head. Silk fibre is obtained at which of the following stage of its life cycle? 1 view. (2) The eggs hatch to form worm-like larvae. Question-answers (Fibre to Fabric) Multiple Choice Questions 1. Production of synthetic fibres has posed a serious threat to the silk industry. You must be familiar with the following nursery rhymes: Fiber or fibre (from Latin: fibra) is a natural or man-made substance that is significantly longer than it is wide. In order to produce silk, the silkworm developing inside the cocoon (as pupa) is not allowed to mature into an adult silk moth. Yarn, fabric and fibres are related to each other. The silk yarn is then woven on looms into silk cloth by the weavers. These spools generally contain 50 or 100 yards. Silk is a fine continuous monofilament fiber of high luster and strength and is highly valued as a prestige fiber. The further development of the pupa into moth continues inside the cocoon. The cocoons are collected and boiled in water to kill the silkworms. Natural fibres – fibre forming material is of the natural origin. Pattanwadi is an Indian breed of sheep found in (a) Gujarat Which fibres are used to make clothes? 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Wool are two fibres which are the characteristics of silk pupa inside the of! Beautiful colours Thus, silk fiber is an animal fiber that wool and silk fibres and the developing silkworm or! Are as follows: the first country to manufacture silk fabric was China all the in!