7. Question 1. Fibre, in textile production, basic unit of raw material having suitable length, pliability, and strength for conversion into yarns and fabrics. Clothes of natural fibres are spoiled due to effect of insects and simple chemicals. The quality of the fibres is largely determined by the efficiency of the retting process. Retting is the processing of extraction of jute fibres from the plant. This would . This is can be reduced by use paper or jute bag. The Question 2. 2. Synthetic Fibres and Plastics Class 8 Science NCERT Textbook Questions. A synthetic fibre is also a chain of small units joined together . Thus, we do not require more lands for the cultivation of cotton and jute crops. Jute leaf’s medicinal values and uses 6.1 While perhaps better known as a fiber crop, jute is also a medicinal "vegetable", eaten from … Certain fiber properties increase its value and desirability in its intended end-use but are not necessary properties essential to make a fiber. In this way, manufacturing synthetic fibres is actually helping conservation of forests. To extract the fibres from the stem, the process is carried out in the following stages : Retting . iv) Synthetic fibres are extremely fine and shiny. They are unaffected by all usual reagents used in identification of fibres. 6. Question 1. Biomaterial composites are made from hemp, kenaf, sisal, soybean, etc. ... Making use of cotton jute bags while shopping. Fibres are also used for making a large variety of household articles. Retting is a process in which the tied bundles of jute stalks are taken to the tank by which fibres get loosened and separated from … ii) Synthetic fibres are light, wrinkled free and easy to maintain. Biodegradation is a natural process in which organic materials (i.e., jute, coconut fibres) are decomposed by microbial activities such as metabolic and enzymatic processes. ... A material which gets decomposed through natural processes, such as action by bacteria is called … Jute plants Jute plant/ Jute seedling of 30-40 days of age with leaves Jute leaf packet for marketing Jute leaf packets for marketing Figure 1: The jute plant and jute leaf marketing packet 6. All synthetic fibres are man-made fibres that are prepared by a number of processes using raw material of petroleum origin, called petrochemicals.. A polymer is made up of many repeating units called monomers. Linen is a plant fibre obtained from flax plant. A material which gets decomposed through natural processes (such as action of bacteria)are called as biodegradable material. Synthetic Fibres (Nylon and Polyester) Synthetic fibres arc very strong so the clothes of these fibres are durable for a long time. Examples : Polyester , ozone , acrylic , nylon , rayon etc. The main component of plant fibres is cellulose . These MCQ Questions on Synthetic Fibres and Plastics Class 8 with answers pave for a quick revision of the Chapter thereby helping you to enhance … Define plastic. Question 3. During this period mucilaginous substances are decomposed and fibres get loose from the sheath. Jute fibre comes from the stem and ribbon (outer skin) of the jute plant and first extracted by retting. Answer: Terylene is a kind of a polyester. Mark ( ) the correct answer. The materials which gets decomposed through natural processes, such as by the action of … Question 2. Jute fibres are long, strong, soft and shiny threads that can be spun into coarse and durable yarn used to make sturdy, affordable and breathable products such as rugs, sacks or rope. iii)Synthetic fibres are less expensive and readily available in the market. Can you name some natural fibres? 16. Jute Products. Jute is a vegetable plant whose fibres are dried… View more Jute is a natural fibre with golden & silky shine, and hence nicknamed as The Golden Fibre. Jute fibres are very long (1 to 4 metres), silky, lustrous and golden brown in colour. Jute is a bast fibre, like flax and hemp, and the stems are processed in a similar way. Jute has the ability to be blended with other fibres, both synthetic and natural, and accepts cellulosic dye classes such as natural, basic, vat, sulfur, reactive, and pigment dyes. A fibre of extreme length is a filament. Its natural golden-brown colour makes it highly versatile and was known as the “wonder crop” until synthetic fibres entered the market and … Each fiber has particular properties which help us to decide which particular fiber should be used to suit a particular requirement. 1.Synthetic fibres andplastics, similar to natural fibres are made up of very large units which in turn are made up of many similiar or combination of small units. Emphasizing Use of Jute . Cotton is a natural fibre obtained from the cotton plant. Answer: Some fibres are called synthetic fibres because they are made by man using chemicals. Jute fibres are long (1 to 4 metres) silky, lustrous and golden brown in colour. Rayon is different from synthetic fibres because (a) it has a … Jute yields four times more fibre per acre than flax. ... Natural fibers, like jute, hemp or cotton, usually … Jute is a natural vegetable fibre obtained from the outer stem and skin of the jute plant. The resulting soggy mass consisting of strands of overlapping fibres … When blended with wool, fashion designers create some of the most innovative and experiential designs. Synthetic fibres possess unique characteristics which make them popular dress materials. Synthetic fibres soak less water so clothes formed by these take less ümc for drying after washing. Answer: Some fibres are called synthetic fibres because they are made by man using chemicals. Jute is an annual crop grown mainly in India, Bangladesh, china and Thailand. The resins and fibres used in the green composites are biodegradable, when they dumped, decomposed by the action of … They are used in filer fabrics for insulation and splinting material. Fabrics are made from fibres obtained from natural or artificial sources. Non biodegradable - a material which cannot be easily decomposed easily by the natural process is known as non biodegradable material. 2.Natural fibres are obtained from plant and animal sources, synthetic fibres are obtained by chemical processing of petrochemicals. Jute is one of the most versatile natural fibres that has been used in raw materials for packaging, textiles, non-textile, and agricultural sectors. 7. Jute is extracted from the bark of the white jute plant, Corchorus capsularis and to a lesser extent from tossa jute (C. olitorius). Synthetic fibre is a chain of small units (like the beads in … Biodegradability is not only of importance when it comes to the ecological aspect or compostability (which is not 100% exactly the same as biodegradability). Also identified as 'the golden fibre' due to its shiny golden colour and economic value, jute is admired for … 8. See Man-Made Fibres; natural f The fibres are cemented with the woody core by gummy and pectinous matters. India is the largest producer and exporter of jute … Chapter 03: Synthetic Fibres and plastics of Science book - The clothes which we wear are made of fabrics. Cotton, jute, coir, hemp, lines are natural plant fibres. The larger units are called polymers. Explain why some fibres are called synthetic. Starches have been yet associated to numerous fibres among which jute fibres , ramie fibres , flax fibres [1, 2], tunicin, whiskers , bleached leafwood fibres , wood pulp or microfibrils from potato pulp . Natural fibres are emerging as low cost, lightweight and apparently environmentally superior alternative to synthetic fibres. Most of these studies showed a high compatibility between starch and natural fibres leading to higher stiffness. A similarly strong increase in ergosterol contents has been observed after adding cellulose-rich jute fibres to soil (Chander et al., 2002). The tissues of the stems are then decomposed under bacterial action. of the decomposition of such fibres by microorganisms has continued for 80 years (Zyska, 1977). Rayon is different from synthetic fibres … Explain why some fibres are called synthetic. 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 Answer: (b) It is obtained from wood pulp 3. Synthetic Fibres The structure of synthetic fibre is similar to that of beads connected to the necklace. It appeared that defoliated Jute plants contained about 75% water, 12% Jute stick, 6% fibres, 6.7% other non- fibrous matter composed of hemicellulose, proteins, fats, pectins and minerals. Carry cotton or jute bags for shopping. The materials which do not get decomposed by various natural processes or take too long to decompose, are called non-biodegradable materials. These fibres are low-grade jute, have less utility than normal jute and are not suitable for spinning. Apart from that, jute fibres are woven into making carpets, curtains, sofa covers and rugs by blending with other materials, natural or synthetic. None set by mzingel. Fibres All fabrics are materials made from many fibres. Mark ( ) the correct answer. Make a list of some common articles made from fibres… Jute is an environmentally friendly fibre that is good for the air, … The jute plant’s fibres lie beneath the bark and surrounded the woody central part of the stem. Solving the Synthetic Fibres and Plastics Multiple Choice Questions of Class 8 Science Chapter 3 MCQ can be of extreme help as you will be aware of all the concepts. Fill in the blanks with appropriate words: (a) Synthetic fibres are also called _____ or _____ fibres. Synthetic fabrics are textiles made from man-made rather than natural fibres. fibres. Glass fibre The fibres consists of sand (silica), mixed with oxides of aluminium, calcium, boron and magnesium. i)Synthetic fibres are very strong and durable. SYNTHETIC FIBRES The fibres made by human beings are called synthetic fibres or man-made fibres. Fibres can occur naturally or can be produced artificially. They rot away with time and hence do not cause pollution in the environment. The content of cellulose depends on the type of fibre in cotton it reaches 94%, in linen fabric around 80%, and in others from 63% to 77% (jute, sisal, hemp). Unmarked set by mzingel While jute is being replaced by relatively cheap synthetic materials in many uses, but jute’s biodegradable nature is suitable for the storage of food … ... paper or jute bag Disposal of plastic is a major problem. Biodegradable materials are materials that can be decomposed by living organisms, mostly micro-organisms such as bacterias. They melt at high temperature and form a transparent bead. The fibres which are obtained from plants and animals are called natural fibres. MigrationNone set by mzingel. In other words, retting is the process by which the pectic materials which bounds the fibres of the remainder of the stem is broken down and the fibres … Inside there is woody core. For Ex: Plant waste,animal waste,paper,cotton,cloth,woollen cloth,jute,wood are all biodegradable material. Synthetic Fibres and Plastics Class 8 Science NCERT Textbook Questions. During retting these gummy and pectinous matters are decomposed and broken down by the action of aquatic micro organisms and the fibres are separated out To grow jute, farmers scatter the seeds on cultivated soil. To which kind of synthetic fibres does terylene belong? Synthetic fibres like nylon, rayon and polyesters are good substitutes for natural fibres like cotton, silk and jute. The clothes that we wear are made up of fibres, which obtained from natural or artificial sources. Jute is a natural fibre, generally known as golden fibre. For this purpose bundles are submerged in gently flowing cleep clean water of tanks or ditches or pond for 10-15 days. The fibres which are man-made and are prepared from chemicals in the laboratory. Wool, silk are natural animal fibres. The retting process involves bundling jute stems together and immersing in low, running water for few days. In gently flowing cleep clean water of tanks or ditches or pond for 10-15 days Chander! 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