Silk . done clear. Sericulture Sericulture means ‘silk farming’. 7. Name the process of taking out silk fibres from the cocoon for use as silk. Silk and wool are two fibres which are made up of proteins. You must be familiar with the following nursery rhymes: f) Silk fibre is obtained from the stem of a plant. The cocoons are then unwrapped to get silk fibre, which is then woven into fabric. A) done clear. In this way, the life history of silk moth is completed. Answer 11 (c) Very Short Answer Questions. (Paper is also made of cellulose obtained from wood pulp). So, silk is an animal fibre. Class 7 Science Chapter 3 MCQ (Multiple Choice Questions) of Fibre to Fabric. Answer: The process of taking out threads from the cocoons for use as silk is called reeling the silk. e) Weaving of yarn makes a piece of fabric. of the following can provide hair as wool source? The silk fibre is made up 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. C. Is a natural fibre. Lotus silk, a natural flower fiber, is rare & highly exclusive fiber. Silk is a natural protein fiber excreted by the moth larva Bombyx mori, better known as the common silkworm. The common natural fibers are cotton, wool, silk, jute and flax. 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. This breaking of cocoon causes damage to its silk threads and hence lowers the quality of silk. 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. a natural fiber that has been used in fire-resistant substances. © 2007-2019 . Silk is a natural fibre which is obtained from an insect (called silk moth). Silk fabric is made from a natural fibre produced from silkworms, popularly mulberry silk. View Solution play_arrow; question_answer7) Woollen fibres are obtained from which of the following things? Sericulture is a very old occupation in India. The cocoon is made by silkworm to protect its development as pupa. c) Jute is the outer covering of coconut. Silk fibres are converted into silk yarn which is used for making silk cloth. Silk fibres are obtained from silkworms. You can use above books for extra knowledge and practicing different questions. B) Cotton done clear. Satin, on the other hand, is a type of fabric weave. Bulk of silk fibres produced is utilised in preparing silk clothes. 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. f) Silk fibre is obtained from the stem of a plant. NCERT Solution for Class 6 Science. Which fibres are used to make clothes? (Paper is also made of cellulose obtained from wood pulp). Do you know which part of the sheep’s body yields 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. 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. All right reserved. (D) All of these. D) Silk done clear. 1 view. Silk is obtained from silkworms. There he found a fabric which was smooth to touch, had vibrant colour and shine. View Solution play_arrow; ... Fibres made from which of the following is suited to be used in cold places? Wool and silk. Silk fibres obtained from cocoons are spun (twisted) to form silk threads called silk yarn. (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. Mulberry silk is soft, lustrous (shiny) and elastic, and can be dyed in beautiful colours Thus. Our aim is to help students learn subjects like Silk is a natural fibre which is obtained from an insect (called silk moth). (a) Silk, chemicals (b) Yak hair, camel hair (c) Husk, bones (d) Flax, wool; Boojho went to a cloth shop. It is interesting to know how the silk fiber is made. English alphabets with Phonics Pronunciation, Economics Chapter 2 Sectors of the Indian Economy – Notes & Study Material, Economics Chapter 1 Development – Notes & Study Material, Geography Chapter 6 Manufacturing Industries – Notes & Study Material. The soft looking silk yarn is as strong as a comparable thread of steel. C) Fleece of sheep. fibres and the developing silkworm (as pupa) gets killed. It is a delicate process of extracting silk fibres from the treated cocoons. As soon as the cocoon is formed it is used to obtain silk. b) Spinning is a process of making fibres. Uses of pure silk are decreasing gradually due to its high cost value and costly maintenance. Chapter 3 - Fibre to Fabric. It is astonishing to learn that the silk fiber is many hundred yards long. Rock wool. The soft looking silk yarn is as strong as a comparable thread of steel. f) Silk fibre … So, silk is an animal fibre. (a) Cotton (b) Jute (c) Silk (d) Wool. Last Updated on March 20, 2019 By Mrs Shilpi Nagpal Leave a Comment. The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori reared in … 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. (D) Oil. Hence, it is preferred for making parachutes. Doctors also use it to make prosthetic arteries. A) Wool worms. Silk fibers are straight and smooth. B) done clear. b) Spinning is a process of making fibres. The rearing of silkworms for obtaining silk is called sericulture. The silky covering spun by the silkworm (or caterpillar) of silk moth is called cocoon. Make sketches of the two stages in the life history of the silk moth which are directly related to the production of silk. 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. (C) Protein. (a) Silk, chemicals (b) Yak hair, camel hair (c) Husk, bones (d) Flax, wool; Boojho went to a cloth shop. Because of its high cost, it finds very limited use in textiles. 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). (A) Natural. Substances in options (a), (b) and (d) are used for making fibres. 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 soft looking silk yarn is as strong as a comparable thread of steel. Silk is a natural fibre which is obtained from an insect (called silk moth). NCERT Solutions for Class 7 Science: Chapter 3 – Fibre to Fabric are given below. (1) The female silk moth lays eggs on the leaves of a tree (such as mulberry tree). 14. Sea silk. The silk obtained from the cocoons of mulberry silk moth is called mulberry silk. For handicrafts and items like parachutes, bicycle tyres, comforter filling and artillery gunpowder bags. done clear. The silk fibers spun by the spider is said to be as strong or even stronger than steel and very elastic. Then it swings its head from side to side in the form of figure of eight. The silkworm continues to develop in the form of pupa inside the cocoon to form the silk moth. The silkworms feed on the leaves of mulberry tree and grow bigger in size. 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 most common variety of silk is – (a) Tussar silk (b) Kota silk (c) Mulberry silk (d) Mooga silk iv. Silk is a natural protein fiber excreted by the moth larva Bombyx mori, better known as the common silkworm. d) The process of removing seed from cotton is called ginning. The silkworm continues to develop in the form of pupa inside the cocoon to form the silk moth. Rayon is a semi-synthetic fibre made from wood pulp. What is its common name? Fibers are often used in the manufacture of other materials. There he found a fabric which was smooth to touch, had vibrant colour and shine. It has several attributes which set it above other fibers. Silkis a fine, strong, soft and shining fibre produced by silkworms in making their cocoons. Which of the following is used for making gunny bags? Question1. D) Silk done clear. The silk gum is dull and stiff. 15. d) The process of removing seed from cotton is called ginning. Silk Fabric: Types of Silk Raw silk: Silk fibre as it comes from the cocoon is coated with a protective layer called silk gum, or sericin. 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. It is the larva (or caterpillar) of a silk moth which produces silk and not the adult silk moth. It has a silk like appearance and is chemically identical to Silk. Silk fibre is made of a protein. Silk fibre is obtained from silk worms. In the next step, these fibres are then spun into threads. For this, the cocoons are either boiled, steamed or treated in an oven. A) Wool done clear. We make "collections," we fill our rooms, our walls, our tables, our desks, with things, things, things. Question 6. B) Cotton done clear. Silk is obtained from the cocoon of silk worms. done clear. Most high-quality silk products are made with silk fibres woven in a specific way – with a charmeuse weave. Out of the following, which are the two terms related to silk production? (a) Cotton (b) Jute (c) Nylon (d) Flax; Which set of substances is not used for making fibres? Silk moth is a kind of insect. Because of its high cost, it finds very limited use in textiles. 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. (a) Cotton (b) Jute (c) Silk (d) Wool ← Prev Question Next Question → 0 votes . The pile of cocoons is used for obtaining silk fibres. (a) Silk, chemicals (b) Yak hair, camel hair (c) Husk, bones (d) Flax, wool; Boojho went to a cloth shop. The commercial and industrial possibilities of spider silk are not yet fully explored. Fibers from plants and animals are constructed directly in nature have very large molecule of polymers. asked 1 hour ago in Polymer Chemistry by Pahi (43.5k points) Which of the following fibres is considered as the strongest natural fibre? (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. Wool. (A) Camel. Even though this was considered to be a legend, the first country to manufacture silk fabric was China. Silk is both softer than human hair but as strong as wire. Steps involved in silk production are as follows: The first step is to collect the cocoons and kill the insect inside them. The caterpillar secretes fibre made of a protein, soon the caterpillar completely covers itself by silk fibres and turns into pupa. 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. So it is also called Artificial Silk. done clear. Comprised of a natural protein fiber, silk mainly consists of fibroin, which is a protein that certain types of insect larvae secrete to make cocoons. Question 3  How will you distinguish between natural and artificial silk? A synthetic fiber which looks like silk is obtained by chemical treatment of wood pulp. When the eggs hatch, silkworms (larvae or caterpillars) come out of eggs. c) Jute is the outer covering of coconut. Learn vocabulary, terms, and more with flashcards, games, and other study tools. 3 Fibre to Fabric I n Class VI you have learnt about some fibres obtained from plants. 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). 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 larva (or caterpillar) of a silk moth which produces silk is called silkworm. Silk fibres are converted into silk yarn which is used for making silk cloth. Silk fibre is obtained from silk worms. Which of the following is not a natural fibre? e) Weaving of yarn makes a piece of fabric. Answer 6 Question 7. B) Carbon compounds. Bulk of silk fibres produced is utilised in preparing silk clothes. Silk is formed in liquid form in the two glands in the silkworms’s head. Synthetic fibres – fibre forming material is made from simpler substances. Man made fibres are considered under two main headings. Silk fibre is made of a protein. The silk fibers spun by the spider is said to be as strong or even stronger than steel and very elastic. Production of synthetic fibres has posed a serious threat to the silk industry. Has low elasticity. The silkworms eat day and night and grow. Make sketches of the two stages in the life history of the silk moth which are directly related to the production of silk. 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. name the fibre of which a cocoon is made? View Solution play_arrow; question_answer7) Woollen fibres are obtained from which of the following things? Given below are the links of some of the reference books for class 7 math. The rearing of silkworms for obtaining silk is called Sericulture. Jute is a natural plant fibre which is long, soft, shiny that can be spun into coarse strong threads. This covering is known as cocoon. 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N Class VI you which of the following makes silk fibre learnt about some fibres obtained from the cocoon of the following fibres as natural synthetic! With flashcards, games, and can be hand-washed, dry-cleaning will the! Shapes and sizes 5 Shearing, scouring, sorting, fibre Spinning, fibre drying, in... Be as strong as a comparable thread of steel yam makes a piece of fabric by unwinding the from! Following things to a suitable temperature for hatching cocoons of silk moth which directly...
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