Natural Polymer Fibres. The silk yarn is then woven on looms into silk cloth by the weavers. As a adjective silk is made … Silk fabric is made from a natural fibre produced from silkworms, popularly mulberry silk. 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. The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. carefully on paper strips (or cloth strips) and sold to silkworm farmers. Filament is a fiber that manufactured is continuous to near continuous lengths for use. The rearing of silkworms, processing of cocoons to obtain silk fibres and making of silk fabrics (silk cloth) from silk fibres. Natural fibres – fibre forming material is of the natural origin. Last Updated on March 20, 2019 By Mrs Shilpi Nagpal Leave a Comment. High-quality silk is a fabric that has been manufactured for thousands of years and has maintained its reputation as a symbol of luxury. The larva (or caterpillar) of a silk moth which produces silk is called silkworm. C) Linen done clear. 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. Harness straps, suspension lines, tents, sleeping bags, sails, rope, tennis strings, fishing poles and lin es, etc. We make "collections," we fill our rooms, our walls, our tables, our desks, with things, things, things. Soon the silkworm (or caterpillar) covers itself by silk fibres and turns into pupa. done clear. Silk is formed in liquid form in the two glands in the silkworms’s head. So, silk is an animal fibre. The fibres in this category may be classified into the following sub groups. 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. View Solution play_arrow; ... Fibres made from which of the following is suited to be used in cold places? B) done clear. Answer 11 (c) Very Short Answer Questions. As a natural protein fiber silk has a significant attraction towards natural dyes. Question 6. e) Weaving of yarn makes a piece of fabric. Sericulture is a very old occupation in India. f) Silk fibre is obtained from the stem of a plant g) Polyester is a natural fibre. Silk is a natural fibre which is obtained from an insect (called silk moth). Satin, on the other hand, is a type of fabric weave. (B) Synthetic. e) Weaving of yarn makes a piece of fabric. … Name the process of taking out silk fibres from the cocoon for use as silk. So, silk is an animal fibre. 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. (a) Cotton (b) Jute (c) Wool (d) Polyster 3. The pile of cocoons is used for obtaining silk fibres. 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. The cocoon is made by silkworm to protect its development as pupa. 1. Hot water makes the silk fibres of cocoons to separate out. material ‘cellulose. It has several attributes which set it above other fibers. Steps involved in silk production are as follows: The first step is to collect the cocoons and kill the insect inside them. What is Silk Fiber in Textile? The silkworms enclose themselves completely inside the silken cocoons in two or three days. Show the relationship by filling the blanks in the following sentence. Other insects can also produce silk. The farmers keep these eggs at suitable temperature and humidity under hygienic conditions. The thin strands are called as yarns which are made from fibre. Learn vocabulary, terms, and more with flashcards, games, and other study tools. g) Polyester is a natural fibre. Your email address will not be published. Pattanwadi is an Indian breed of sheep found in (a) Gujarat So, silk is an animal fibre. Steps involved in silk production are as follows: The first step is to collect the cocoons and kill the insect inside them. A) Wool worms. For this, the cocoons are either boiled, steamed or treated in an oven. The silkworm continues to develop in the form of pupa inside the cocoon to form the silk moth. C) done clear. The silk yarn (thread) is obtained from the cocoon of the silk … Silk is a natural fibre which is obtained from an insect (called silk moth). The silk fibers spun by the spider is said to be as strong or even stronger than steel and very elastic. Mulberry silk is soft, lustrous (shiny) and elastic, and can be dyed in beautiful colours Thus. (a) Cotton (b) Jute (c) Silk (d) Wool. big in size. 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. Chapter 3 - Fibre to Fabric. Has low elasticity. Which of the following fibres is considered as the strongest natural fibre? Silk is a natural protein fiber produced by silkworms that are kept in captivity. All right reserved. 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). NCERT Solutions for Class 7 Science: Chapter 3 – Fibre to Fabric are given below. 7. 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. Rock wool. 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. It is composed mainly of fibroin. While other insects also produce silk-like substances, most of the world’s silk is derived from Bombyx mori larvae, which are worms that only live on mulberry trees. 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. For this, the cocoons are either boiled, steamed or treated in an oven. Fibers from plants and animals are constructed directly in nature have very large molecule of polymers. © 2007-2019 . She has started this educational website with the mindset of spreading Free Education to everyone. D) Silk done clear. (a) Silk, chemicals (b) Yak hair, camel hair (c) Husk, bones (d) Flax, wool; Boojho went to a cloth shop. of the following can provide hair as wool source? done clear. Most high-quality silk products are made with silk fibres woven in a specific way – with a charmeuse weave. Question 16. Even though this was considered to be a legend, the first country to manufacture silk fabric was China. Rayon is a semi-synthetic fibre made from wood pulp. The next step is reeling or filature. Silk thread woven by silkworm around its larva is made up of - (A) Carbohydrate. C) Fleece of sheep. For handicrafts and items like parachutes, bicycle tyres, comforter filling and artillery gunpowder bags. Silk fibres are converted into silk yarn which is used for making silk cloth. Answer:cocoon stage of silk moth gives silk fibre.Dipping the cocoons in hot water,and taking silk fibres from them.good luckkeep growing f) Silk fibre is obtained from the stem of a plant. Plastic articles are available in all possible shapes and sizes. This covering is known as cocoon. As soon as the cocoon is formed it is used to obtain silk. Silk fibres are obtained from silkworms. Its fibres can be woven like those of natural fibres. State whether the following statements are true or false: a) Yarn is made from fibres. (D) Oil. Almost the entire commercial silk industry is based on one insect-the silkworm. 6. insect fiber that is spun by a silkworm to make its cocoon; the fiber reflects light and has insulating properties. b) Spinning is a process of making fibres. (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. This is a golden yellow silk produced by strong silk fibers made from the silk worm Antheraea assamensis found in Assam state in India. In the manufacture of clothing, dress materials, curtains and upholstery. Silkis a fine, strong, soft and shining fibre produced by silkworms in making their cocoons. A) done clear. Then it swings its head from side to side in the form of figure of eight. Asbestos, rock wool, and fiber glass. asked 1 hour ago in Polymer Chemistry by Pahi (43.5k points) Which of the following fibres is considered as the strongest natural fibre? e) Weaving of yarn makes a piece of fabric. done clear. Silk is neither wrinkle or sun resistant, and over-exposure to sunlightwill weaken and fade the fabric. animal fiber coming most often from sheep, but may be goat (mohair), rabbit (angora), camel, alpaca, llama. Through a special manufacturing process, it is made suitable for use as nonabsorbable surgical sutures. It is interesting to know how the silk fiber is made. Other insects also produce silk, but the aforementioned type has been used for textile manufacturing. 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. 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. Silk fibre is obtained from silk worms. (a) Cotton (b) Jute (c) Nylon (d) Flax; Which set of substances is not used for making fibres? A) done clear. Make a list of the four chemical bases and put each fiber into its proper category. 12. Chapter 3 - Fibre to Fabric. Reeling is done in special machines which unwind the fibres of silk from cocoons. Given below are the links of some of the reference books for class 7 math. Tensile strength is the measure of the maximum resistance of longitudinal stress before it breaks.The different properties of each fibre depends upon the source and orientation of that particular fibre. (D) None of these. A) Wool done clear. There he found a fabric which was smooth to touch, had vibrant colour and shine. Which of the following is not a natural fibre? Which fibres are used to make clothes? Thanks for visiting our website. The silk obtained from the cocoons of mulberry silk moth is called mulberry silk. is formed in liquid form in the two glands in the silkworms’s head. e) Weaving of yam makes a piece of fabric. State whether the following statements are true or false: a) Yarn is made from fibres. g) Polyester is a natural fibre. All material given in this website is a property of physicscatalyst.com and is for your personal and non-commercial use only, Gravitation NCERT Solutions Class11 physics, Trigonometry Formulas for class 11 (PDF download), Newton�s law Interesting conceptual questions, Difference between resistance and resistivity, Fibre to Fabric Class 7 Important Questions, Science Foundation Course For JEE/NEET/NSO/Olympiad - Class 7, CBSE All In One Science Class 7 by Arihant Experts (Author), IIT Foundation Physics, Chemistry & Maths for Class 7. You must be familiar with the following nursery rhymes: 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. Doctors also use it to make prosthetic arteries. The common natural fibers are cotton, wool, silk, jute and flax. View Solution play_arrow; question_answer7) Woollen fibres are obtained from which of the following things? Uses of pure silk are decreasing gradually due to its high cost value and costly maintenance. The adult female silk moth then lays more eggs. (B) Fat. The further development of the pupa into moth continues inside the cocoon. 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). A minor amount of wild tussah silk is produced for specialty items. done clear. Spider silk. A female silk moth lays hundreds of eggs at a time.The eggs of silk moths are stored. Which of the following fibres is considered as the strongest natural fibre? A) Wool done clear. The process of taking out silk fibres from the cocoons for use as silk is called reeling. 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. Answer: (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. In the next step, these fibres are then spun into threads. Fibers are often used in the manufacture of other materials. The cocoons are then unwrapped to get silk fibre, which is then woven into fabric. The strongest engineering materials often incorporate fibers, for example carbon fiber and ultra-high-molecular-weight polyethylene.. Sea silk. 3 Fibre to Fabric I n Class VI you have learnt about some fibres obtained from plants. Silk is obtained from silkworms. Silk . Silk fibres obtained from cocoons are spun (twisted) to form silk threads called silk yarn. Bulk of silk fibres produced is utilised in preparing silk clothes. 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. Some of the varieties of silk are : Mulberry silk; Tassar silk ; Mooga silk ; Kosa silk; and Eri silk. Silk is a natural protein fiber excreted by the moth larva Bombyx mori, better known as the common silkworm. Satin, on the other hand, is a type of fabric weave. The silk produced by the silkworms of different varieties of silk moths is different in texture (coarse, smooth, shiny, etc.). India produces a lot of silk on a commercial scale. It is astonishing to learn that the silk fiber is many hundred yards long. Lotus silk, a natural flower fiber, is rare & highly exclusive fiber. Asbestos. This covering is known as cocoon. Question 3 How will you distinguish between natural and artificial silk? (a) Power loom (b) Handloom (c) Charkha (d) Knitting needles. Question 17. Out of the following, which are the two terms related to silk production? Answer 6 Question 7. Because of its high cost, it finds very limited use in textiles. The rearing of silkworms for obtaining silk is called sericulture. (a) Cotton (b) Jute (c) Silk (d) Wool ← Prev Question Next Question → 0 votes . Name the stage next to caterpillar in the life cycle of silk moth. i. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon ii. (Paper is also made of cellulose obtained from wood pulp). Question 12. Answer 5 Shearing, scouring, sorting, fibre spinning, fibre drying, rolling in silk yarn. One of the advantages of nylon over rayon is that nylon: A. While other insects also produce silk-like substances, most of the world’s silk is derived from Bombyx mori larvae, which are worms that only live on mulberry trees. It is the larva (or caterpillar) of a silk moth which produces silk and not the adult silk moth. You also learnt that wool and silk fibres are obtained from animals. Silk is a fine continuous monofilament fiber of high luster and strength and is highly valued as a prestige fiber. Silk fibres come from cocoons of the silk moth. The eggs are then warmed to a suitable temperature for hatching. Substances in options (a), (b) and (d) are used for making fibres. You must be familiar with the following nursery rhymes: Mineral fibers. (a) Cotton (b) Jute (c) Silk (d) Wool ← Prev Question Next Question → 0 votes . 1 view. (Paper is also made of cellulose obtained from wood pulp). Q2. View Solution play_arrow; question_answer7) Woollen fibres are obtained from which of the following things? Silk is a natural protein fiber, some forms of which can be woven into textiles. Question-answers (Fibre to Fabric) Multiple Choice Questions 1. What is its common name? Q2. Silk fibres are converted into silk yarn which is used for making silk cloth. Cellulosic- seed, bast, leaf; cotton, linen, hemp Protein- Hair, wool filament; silk, wool , cashmere, alpaca Terrycot is made by mixing two types of fibres. It is obtained from the stems of jute plants (Corchorus). How is it done? The silk fibre is made up of a protein. Answer 5 Shearing, scouring, sorting, fibre spinning, fibre drying, rolling in silk yarn. 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. D) done clear. Fiber or fibre (from Latin: fibra) is a natural or man-made substance that is significantly longer than it is wide. Silk fibre is made of a protein. 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. Which . NCERT Solution for Class 6 Science. asked 1 hour ago in Polymer Chemistry by Pahi (43.5k points) Which of the following fibres is considered as the strongest natural fibre? Question 5 What is a cocoon? Synthetic fibres – fibre forming material is made from simpler substances. Silk fibre is obtained at which of the following stage of its life cycle? The commercial and industrial possibilities of spider silk are not yet fully explored. Write the names of the fibres. 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 caterpillar secretes fibre made of a protein, soon the caterpillar completely covers itself by silk fibres and turns into pupa. Is wrinkle free. Silk moth is a kind of insect. 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) Jute is the outer covering of coconut. Silk is obtained from the cocoon of silk worms. It is a delicate process of extracting silk fibres from the treated cocoons. Production of synthetic fibres has posed a serious threat to the silk industry. Question 7 Describe how silk is produced? State whether the following statements are true or false: a) Yarn is made from fibres. This covering is known as Cocoon. C. Is a natural fibre. (a) Cotton (b) Jute (c) Nylon (d) Flax; Which set of substances is not used for making fibres? This means that the average silk fiber is longer than the silk thread that is wound on a spool of sewing silk. Silk fibers are straight and smooth. Silk fibre is obtained at which of the following stage of its life cycle? These spools generally contain 50 or 100 yards. B) done clear. Which of the following is used for making gunny bags? C) Linen done clear. The cocoons having developing silkworms inside them are used to obtain silk. c) Jute is the outer covering of coconut. (D) All of these. Silk fibre is obtained from silk worms. Answer: The process of taking out threads from the cocoons for use as silk is called reeling the silk. The silkworms feed on the leaves of mulberry tree and grow bigger in size. Production of synthetic fibres has posed a serious threat to the silk industry. The pile of cocoons is placed in hot water. This breaking of cocoon causes damage to its silk threads and hence lowers the quality of silk. a natural fiber that has been used in fire-resistant substances. 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. (C) Alpaca. Silk is a fine, strong, soft and shining fibre produced by silkworms in making their cocoons. d) The process of removing seed from cotton is called ginning. There he found a fabric which was smooth to touch, had vibrant colour and shine. 4. (2) The eggs hatch to form worm-like larvae. are also made from nylon fibers because of its strength. The commercial and industrial possibilities of spider silk are not yet fully explored. Your email address will not be published. The silkworms are fed cut-up mulberry leaves. Silk is a natural protein fiber excreted by the moth larva Bombyx mori, better known as the common silkworm.
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