26. (c) True (d) True. c) Jute is the outer covering of coconut. Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. Q.1 Give whether following fibres as natural or synthetic: Wool, Nylon, cotton, silk, polyester, Jute. man-made, artificial fibres. Explain the process of making yarn from fibre. Ans. Wool is an example of a synthetic fiber. From which parts of the plant cotton and jute are obtained? Comment; Complaint; Link; Katalaya 1 November, 21:58. Linen yarn is woven from the long fibers found behind the bark in a multi-layered stalk of the flax plant. 5. The fibres of cotton and wool have many folds and uneven surfaces. • Notes accompanying the disc offer facts about synthetic fibres, hydrocarbons, and plastics together with true or false quizzes. b) Spinning is a process of making fibres. Adjective (en adjective) Man-made; of artifice. • And like the film Jaws, true or false, this is a story that will run and run. 707 Views. Which of the following items are made up of animal fibre? Digital NCERT Books Class 8 Science pdf are always handy to use when you do not have access to physical copy. Ask your question. (b) The process of making yarn from fibres is called knitting. The first stage was cloth from plant fibres, such as flax, cotton, nettles and inner bark of the trees. 0. (d) Patsun plant is used to obtain jute fibres. Play this game to review Environmental Chemistry. d) The process of removing seed from cotton is called ginning. (d) Cotton yarn on burning gives an odor similar to that of a burning paper. 3. Answer: A quilt is made up of wool or fibres obtained from animal fur. False because wool is natural it comes from sheep and synthetic means it was made unnaturally. The fibre obtained from hemp and flax plants is used to make paper. (e) Yarn is made from fibres. Synthetic fibres: nylon, polyester . b) Spinning is a process of making fibres. (iv) Most of the plastics are biodegradable. Living Science 2019 Solutions for Class 7 Science Chapter 4 Animal Fibres are provided here with simple step-by-step explanations. State whether the following statements are true or false: a) Yarn is made from fibres. false A most useful physical property of fibers is that many _____ fibers exhibit double refraction or birefringence when viewed under a polarizing microscope. * {{quote-magazine, title=A better waterworks, date=2013-06-01, volume=407, issue=8838 , page=5 (Technology Quarterly), magazine=(The Economist) citation, passage=An artificial kidney these days still means a refrigerator-sized dialysis machine.Such devices mimic the way real kidneys cleanse blood and eject impurities and surplus water as urine. Answers (2) Brendan 1 November, 21:02. In order to restore cellulose fibers from the plant, the wooden trunk and the inner pith (pectin), which binds the fibers together in a clump, must be eliminated away. Raw jute fibres are red in colour. Cellulose fibers (/ ˈ s ɛ lj ʊ l oʊ s,-l oʊ z /) are fibers made with ethers or esters of cellulose, which can be obtained from the bark, wood or leaves of plants, or from other plant-based material. Lay flat to dry. c) Jute is the outer covering of coconut. True False. Name two items that are made from coconut fibre. 6. (iii) It is risky to wear synthetic clothes while working in the kitchen. Such fibres have air spaces in them, which trap air and do not allow the body heat to escape. Millions of tons are produced every year. d) The process of removing seed from cotton is called ginning. (g) Polyester is a natural fibre. Synthetic Fibres: nylon, polyester . The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. The best yield of both fibre and oil may be obtained if the crop is pulled exactly in the middle period between flowering and final ripening. 4. Most of the plastics are biodegradable. Flax fibres undergo a certain amount of lignification as they grow older, that is, they become hard and more brittle instead of remaining soft and silky. NCERT Book for Class 8 Science Chapter 3 Synthetic Fibers and Plastics is available for reading or download on this page. Correct statements (a) Silk is an animal fibre. This article reviews the composition, structure, and properties of man-made fibres, both regenerated and synthetic, and then describes the ways in which they are spun, drawn, and textured into useful fibres. Classify the following fibres as natural or synthetic: nylon, wool, cotton, silk, polyester, jute 2. Classify the following fibres as natural or synthetic: nylon, wool, cotton, silk, polyester , jute 2. 0. 2. Silk came to various parts of the world from China. They include nylon, acrylics, polyurethane, and polypropylene. d) The process of removing seed from cotton is called ginning. (c) Cotton fibre is fibre which is obtained from the leaves of the cotton plant. Log in. (ii) Synthetic fibres do not melt on heating. Flax and jute have fibres on its fruits. synthetic _____ are composed of a large number of atoms arranged in repeating units. In this project she has to make a list of items from her home that are made up of different fibres and she has to classify them into plant, animal or synthetic fibres on the basis of the fabric from which these item are made up of. Ans: Natural fibres: cotton, silk, jute. Question 26. CBSE Worksheets for Class 6 Science Fibre to Fabric Assignment 4; D. Answer the following questions in short: 1. Synthetic fibres are man-made fibres, most of them are prepared from raw material petroleum called petrochemicals. _____±exTle knowledge provides the professional with the ability to make a more informed product development decision. (b) Jute is obtained from the leaves of a plant. Students who are in Class 8 or preparing for any exam which is based on Class 8 Science can refer NCERT Science Book for their preparation. Flax blooms and softens beautifully with each trip through the washing machine.Care: Machine wash cool. Answer 25. Spinning- It is a process of making fibres… D. Customer saTsfacTon E. Branding 8) True/False (3 points) _____±here is only one best choice for any texTle product need. (c) Jute is the outer covering of coconut. Silk fiber is obtained from the stem of a plant. f) Silk fibre is obtained from the stem of a plant. _____±exTles should perform the same regardless of the target market for which it is intended. State whether the following statements are true or false: a) Yarn is made from fibres. Answers: State whether ‘True’ or ‘False’. 5. It can be used 100% alone, or in blends with other natural and synthetic fibers. e) Weaving of yarn makes a piece of fabric. True or False: Statistical databases are available for determining the probability of a fiber's origin. Bed-sheets, Sweater, Jeans, School bag. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. The second stage began with the use of animal fibres especially wool and silk. True or False Natural fibres are obtained from plants and animals where as synthetic fibres are obtained by chemical processing of petrochemicals. False, Wool, is made from Sheep or goats etc. • Your biggest task is to make your true or false statements challenging for your readers. d) The process of removing seed from cotton is called ginning. Fibres are made from the yarns. 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