[50] Following the destructive Mill River Flood of 1874, one manufacturer, William Skinner, relocated his mill from Williamsburg to the then-new city of Holyoke. It is known as Resham in eastern and north India, and Pattu in southern parts of India. It can be weakened if exposed to too much sunlight. Hemp Another important plant fibre is hemp. The tradition of wearing silk sarees for marriages and other auspicious ceremonies is a custom in Assam and southern parts of India. Answer: Jute fibres are obtained from the stems of the jute plant.The cotton fibre is obtained from the fruit of the cotton plant known as cotton balls. ⦠[23][24] Shelagh Vainker, a silk expert at the Ashmolean Museum in Oxford, who sees evidence for silk production in China "significantly earlier" than 2500–2000 BC, suggests, "people of the Indus civilization either harvested silkworm cocoons or traded with people who did, and that they knew a considerable amount about silk. Silk is considered to be a symbol of royalty, and, historically, silk was used primarily by the upper classes. Can you explain this answer? [41], During World War II, supplies of silk for UK parachute manufacture were secured from the Middle East by Peter Gaddum. The silk farmers then heat the cocoons to kill them, leaving some to metamorphose into moths to breed the next generation of caterpillars. The shimmering appearance of silk is due to the triangular prism-like structure of the silk fibre, which allows silk cloth to refract incoming light at different angles, thus producing different colors. Silks derived from Bombyx mori are generally made of two parts: the silk fibroin fiber which contains a light chain of 25kDa and a heavy chain of 350kDa (or 390kDa[76]) linked by a single disulfide bond[77] and a glue-like protein, sericin, comprising 25 to 30 percentage by weight. Can you explain this answer? vrasmi42. Protease XIV from Streptomyces griseus and α-chymotrypsin from bovine pancreases are the two popular enzymes for silk degradation. [56], To produce 1 kg of silk, 104 kg of mulberry leaves must be eaten by 3000 silkworms. '[63], Silk is a poor conductor of electricity and thus susceptible to static cling. (D) True (E) True (F) False : Silk fibre is obtained from silkworm (animal). In addition, silk materials can retain strength over a desired period from weeks to months as needed by mediating the content of beta sheets. Why are plant fibres losing their importance? Wool is obtained from the fur of animals like sheep, yak etc. Sea silk from certain large sea shells was also valued. Plant fibres are obtained from _____and_____. It is often used for clothing such as shirts, ties, blouses, formal dresses, high fashion clothes, lining, lingerie, pajamas, robes, dress suits, sun dresses and Eastern folk costumes. Wang et al. Question 4: From which parts of the plant cotton and jute are obtained? Harvested cocoons are then soaked in boiling water to soften the sericin holding the silk fibers together in a cocoon shape. It has a good moisture regain of 11%. (f) Silk fibre is obtained from the stem of a plant. However, further research fails to prove clearly the contribution of sericin to inflammatory responses based on isolated sericin and sericin based biomaterials. (c) Silk saree (d) Nylon scarf Solution: (a): Jute Bag. Silk: It's filament is a continuous thread of great tensile strength measuring from 500 to 1 500 metres in length, with a diameter of 10-13 microns. [12] The first evidence of the long distance silk trade is the finding of silk in the hair of an Egyptian mummy of the 21st dynasty, c.1070 BC. Silk is one of the strongest natural fibers, but it loses up to 20% of its strength when wet. (g) Polyester is a natural fibre. The pupae are killed by either dipping them in boiling water before the adult moths emerge or by piercing them with a needle. Coir, seed-hair fibre obtained from the outer shell, or husk, of the coconut, the fruit of Cocos nucifera, a tropical plant of the Arecaceae family. These factors all contribute to the ability of the whole cocoon to be unravelled as one continuous thread, permitting a much stronger cloth to be woven from the silk. Strike out the one which is a fibre obtained from animal. Ans: Jute is obtained from stem and cotton is obtained from cotton bolls which are directly from surface of cotton seeds. Legend has it that monks working for the emperor Justinian I smuggled silkworm eggs to Constantinople in hollow canes from China. [83] There are still concerns about the long-term safety of silk-based biomaterials in the human body in contrast to these promising results. Biocompatibility, i.e., to what level the silk will cause an immune response, is a critical issue for biomaterials. (a) Silk is a plant fibre. a) Plant fibres are obtained from jute and cotton. It is yellowed by perspiration. (b) Jute is obtained from the leaves of a plant. Name two items that are made from the coconut fibre. Once the worms start pupating in their cocoons, these are dissolved in boiling water in order for individual long fibres to be extracted and fed into the spinning reel. Biodegradable materials can minimize the pain of patients from surgeries, especially in tissue engineering, there is no need of surgery in order to remove the scaffold implanted. Answer: Cotton is obtained from the fruits of the cotton plant, called cotton balls. There has been some research into other types of silk, which differ at the molecular level. 2. Silk fibre is obtained from the stem of the plant ? Bave diameters for tussah silk can reach 65 μm. Enzymes are the means used to achieve degradation of silk in vitro. There is almost no gradual shrinkage nor shrinkage due to molecular-level deformation. Question bank for Class 7. Silk has a smooth, soft texture that is not slippery, unlike many synthetic fibers. It yields a stiff fibre used in making rope and various other products. Can you explain this answer? Most products fabricated from regenerated silk are weak and brittle, with only ≈1–2% of the mechanical strength of native silk fibers due to the absence of appropriate secondary and hierarchical structure. Building Line Following and Food Following RobotsBuilding Line Following and Food Following, RD Sharma Solutions for Class 7 Mathematics. James I attempted to establish silk production in England, purchasing and planting 100,000 mulberry trees, some on land adjacent to Hampton Court Palace, but they were of a species unsuited to the silk worms, and the attempt failed. In addition, mechanical properties of silks from various kinds of silkworms vary widely, which provides more choices for their use in tissue engineering. Fibres are obtained from the stem of two species, i.e., C. capsularis and C. olitorius. [1] The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori reared in captivity (sericulture). World War II interrupted the silk trade from Asia, and silk prices increased dramatically. Therefore, to obtain silk, the Koya is put into the boiling water, so that the silkworm which is inside it, died there and segregates thread from it. In the Odyssey, 19.233, when Odysseus, while pretending to be someone else, is questioned by Penelope about her husband's clothing, he says that he wore a shirt "gleaming like the skin of a dried onion" (varies with translations, literal translation here)[32] which could refer to the lustrous quality of silk fabric. The coarse, stiff, reddish brown fibre is made up of smaller threads, each about 0.01 to 0.04 inch (0.03 to 0.1 centimetre) long and 12 to 24 microns (a micron is about 0.00004 inch) in diameter, composed of lignin , a woody plant substance, and cellulose . over here on EduRev! [60], Silk fibers from the Bombyx mori silkworm have a triangular cross section with rounded corners, 5–10 μm wide. [49] With the mulberry tree craze of that decade, other smaller producers began raising silkworms. Q5. Kuhn, Dieter (1995). To do this, skeins of silk thread are immersed in large tubs of hydrogen peroxide. [28], The Rajshahi Division of northern Bangladesh is the hub of the country's silk industry. [31] There are disputes regarding the amount of silk a fabric can consist of (e.g., whether a small decorative silk piece on a cotton caftan is permissible or not) for it to be lawful for men to wear, but the dominant opinion of most Muslim scholars is that the wearing of silk by men is forbidden. 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