8. Synthetic Fibres and Plastics Class 8 Science NCERT Textbook Questions. 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 … 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 . 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. To which kind of synthetic fibres does terylene belong? Biodegradability is not only of importance when it comes to the ecological aspect or compostability (which is not 100% exactly the same as biodegradability). Linen is a plant fibre obtained from flax plant. They are used in filer fabrics for insulation and splinting material. ... paper or jute bag Disposal of plastic is a major problem. 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. Synthetic fibres possess unique characteristics which make them popular dress materials. ... Making use of cotton jute bags while shopping. Biodegradable materials are materials that can be decomposed by living organisms, mostly micro-organisms such as bacterias. Rayon is different from synthetic fibres … 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 … 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 … Jute fibres are long (1 to 4 metres) silky, lustrous and golden brown in colour. Fabrics are made from fibres obtained from natural or artificial sources. Answer: Terylene is a kind of a polyester. This is can be reduced by use paper or jute bag. The resins and fibres used in the green composites are biodegradable, when they dumped, decomposed by the action of … 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. Cotton is a natural fibre obtained from the cotton plant. Synthetic fabrics are textiles made from man-made rather than natural fibres. iii)Synthetic fibres are less expensive and readily available in the market. None set by mzingel. Each fiber has particular properties which help us to decide which particular fiber should be used to suit a particular requirement. Question 2. Its natural golden-brown colour makes it highly versatile and was known as the “wonder crop” until synthetic fibres entered the market and … Glass fibre The fibres consists of sand (silica), mixed with oxides of aluminium, calcium, boron and magnesium. The resulting soggy mass consisting of strands of overlapping fibres … 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. Synthetic fibres soak less water so clothes formed by these take less ümc for drying after washing. ii) Synthetic fibres are light, wrinkled free and easy to maintain. Non biodegradable - a material which cannot be easily decomposed easily by the natural process is known as non biodegradable material. Answer: Some fibres are called synthetic fibres because they are made by man using chemicals. 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. Make a list of some common articles made from fibres… ... Natural fibers, like jute, hemp or cotton, usually … The iv) Synthetic fibres are extremely fine and shiny. Jute fibres are very long (1 to 4 metres), silky, lustrous and golden brown in colour. 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). MigrationNone 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 … Answer: Some fibres are called synthetic fibres because they are made by man using chemicals. For Ex: Plant waste,animal waste,paper,cotton,cloth,woollen cloth,jute,wood are all biodegradable material. Wool, silk are natural animal fibres. Jute is an environmentally friendly fibre that is good for the air, … Jute is extracted from the bark of the white jute plant, Corchorus capsularis and to a lesser extent from tossa jute (C. olitorius). i)Synthetic fibres are very strong and durable. Fibres can occur naturally or can be produced artificially. 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. Fibres are also used for making a large variety of household articles. Retting is the processing of extraction of jute fibres from the plant. Mark ( ) the correct answer. Inside there is woody core. Explain why some fibres are called synthetic. Synthetic fibres like nylon, rayon and polyesters are good substitutes for natural fibres like cotton, silk and jute. Jute fibre comes from the stem and ribbon (outer skin) of the jute plant and first extracted by retting. Clothes of natural fibres are spoiled due to effect of insects and simple chemicals. Rayon is different from synthetic fibres because (a) it has a … Certain fiber properties increase its value and desirability in its intended end-use but are not necessary properties essential to make a fiber. The retting process involves bundling jute stems together and immersing in low, running water for few days. They rot away with time and hence do not cause pollution in the environment. Fill in the blanks with appropriate words: (a) Synthetic fibres are also called _____ or _____ fibres. fibres. The fibres which are obtained from plants and animals are called natural fibres. Emphasizing Use of Jute . Synthetic Fibres and Plastics Class 8 Science NCERT Textbook Questions. 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 … They are unaffected by all usual reagents used in identification of fibres. 7. Cotton, jute, coir, hemp, lines are natural plant fibres. 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. Mark ( ) the correct answer. Also identified as 'the golden fibre' due to its shiny golden colour and economic value, jute is admired for … 7. To extract the fibres from the stem, the process is carried out in the following stages : Retting . The clothes that we wear are made up of fibres, which obtained from natural or artificial sources. See Man-Made Fibres; natural f In this way, manufacturing synthetic fibres is actually helping conservation of forests. 2.Natural fibres are obtained from plant and animal sources, synthetic fibres are obtained by chemical processing of petrochemicals. 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. Jute is an annual crop grown mainly in India, Bangladesh, china and Thailand. Synthetic Fibres The structure of synthetic fibre is similar to that of beads connected to the necklace. During this period mucilaginous substances are decomposed and fibres get loose from the sheath. Question 1. Jute is a natural vegetable fibre obtained from the outer stem and skin of the jute plant. Can you name some natural fibres? The materials which do not get decomposed by various natural processes or take too long to decompose, are called non-biodegradable materials. The main component of plant fibres is cellulose . Jute Products. Explain why some fibres are called synthetic. Examples : Polyester , ozone , acrylic , nylon , rayon etc. Jute is one of the most versatile natural fibres that has been used in raw materials for packaging, textiles, non-textile, and agricultural sectors. Jute is a bast fibre, like flax and hemp, and the stems are processed in a similar way. Synthetic Fibres (Nylon and Polyester) Synthetic fibres arc very strong so the clothes of these fibres are durable for a long time. Most of these studies showed a high compatibility between starch and natural fibres leading to higher stiffness. For this purpose bundles are submerged in gently flowing cleep clean water of tanks or ditches or pond for 10-15 days. 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. SYNTHETIC FIBRES The fibres made by human beings are called synthetic fibres or man-made fibres. Carry cotton or jute bags for shopping. Chapter 03: Synthetic Fibres and plastics of Science book - The clothes which we wear are made of fabrics. Thus, we do not require more lands for the cultivation of cotton and jute crops. 2. Fibres All fabrics are materials made from many fibres. Jute is a natural fibre, generally known as golden fibre. Biomaterial composites are made from hemp, kenaf, sisal, soybean, etc. Jute yields four times more fibre per acre than flax. The quality of the fibres is largely determined by the efficiency of the retting process. Synthetic fibre is a chain of small units (like the beads in … Define plastic. 6. Question 2. 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. 16. A fibre of extreme length is a filament. ... A material which gets decomposed through natural processes, such as action by bacteria is called … Question 3. A material which gets decomposed through natural processes (such as action of bacteria)are called as biodegradable material. A synthetic fibre is also a chain of small units joined together . They melt at high temperature and form a transparent bead. When blended with wool, fashion designers create some of the most innovative and experiential designs. The jute plant’s fibres lie beneath the bark and surrounded the woody central part of the stem. The fibres are cemented with the woody core by gummy and pectinous matters. A similarly strong increase in ergosterol contents has been observed after adding cellulose-rich jute fibres to soil (Chander et al., 2002). Fibre, in textile production, basic unit of raw material having suitable length, pliability, and strength for conversion into yarns and fabrics. The materials which gets decomposed through natural processes, such as by the action of … Question 1. The fibres which are man-made and are prepared from chemicals in the laboratory. The tissues of the stems are then decomposed under bacterial action. The larger units are called polymers. 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. of the decomposition of such fibres by microorganisms has continued for 80 years (Zyska, 1977). Natural fibres are emerging as low cost, lightweight and apparently environmentally superior alternative to synthetic fibres. India is the largest producer and exporter of jute … Unmarked set by mzingel 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. This would .