From which parts of the plant cotton and jute are obtained? In addition, mechanical properties of silks from various kinds of silkworms vary widely, which provides more choices for their use in tissue engineering. Synthetic Fibre. State whether the following statemepts are true or false â Yarn is made from fibres. "Clinical Effectiveness of a Silk Fabric in the Treatment of Atopic Dermatitis". Legend has it that monks working for the emperor Justinian I smuggled silkworm eggs to Constantinople in hollow canes from China. This economy particularly gained traction in the vicinity of Northampton, Massachusetts and its neighboring Williamsburg, where a number of small firms and cooperatives emerged.  showed the in vivo degradation of silk via aqueous 3-D scaffolds implanted into Lewis rats. This is Science Class 6 Fibre to Fabric CBSE Questions & Answers. There is almost no gradual shrinkage nor shrinkage due to molecular-level deformation. Ans : Fibres that are obtained from nature, i.e., from plants and animals are called natural fibres and those made by humans by chemical methods are known as synthetic fibres. The tradition of wearing silk sarees for marriages and other auspicious ceremonies is a custom in Assam and southern parts of India. Question 2. Spinning is a process of making fibres. In addition, silk materials can retain strength over a desired period from weeks to months as needed by mediating the content of beta sheets. Harvested cocoons are then soaked in boiling water to soften the sericin holding the silk fibers together in a cocoon shape. (b) Jute is obtained from the leaves of a plant. Cotton and jute are examples of fibres obtained from plants. The Shakers in Kentucky adopted the practice. Commercial silks originate from reared silkworm pupae, which are bred to produce a white-colored silk thread with no mineral on the surface. (c) Weaving is a process of arranging two sets of yarns together. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. JUTE KNOWN AS THE GOLDEN PLANT JUTE IS GROWN IN PLACES HAVING HUMIDITY AND IS BEST GROWN IN ALLUVIAL SOIL. 2.Silk, wool Q.4 Jute and cotton are obtained from which part of the plant? Nonetheless sericulture reached Korea with technological aid from China around 200 BC, the ancient Kingdom of Khotan by AD 50, and India by AD 140. Flax is also a plant that gives natural fibres. It is a bast fibre, obtained from the â¦ "Appendix C: Wild Silks," pp.477–480. The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. Q.5. Another concern arises from biodegradation because the biocompatibility of silk fibroin does not necessarily assure the biocompatibility of the decomposed products. Genetic modification of domesticated silkworms has been used to alter the composition of the silk. Silkworm silk therefore has a linear density of approximately 1 den, or 1.1 dtex. , As the process of harvesting the silk from the cocoon kills the larvae by boiling them, sericulture has been criticized by animal welfare and rights activists. The difference is that hand-reeled threads produce three grades of silk: two fine grades that are ideal for lightweight fabrics, and a thick grade for heavier material. This trade was so extensive that the major set of trade routes between Europe and Asia came to be known as the Silk Road. Silk fibre is obtained at which of the following stage of its life cycle?a)b)c)d)Correct answer is option 'C'. Silk cotton Silk cotton is obtained from kapok tree. Biodegradability (also known as biodegradation)—the ability to be disintegrated by biological approaches, including bacteria, fungi, and cells—is another significant property of biomaterials today. Answer: Rope and doormats. They have been reared since ancient times similar to other East and South-East Asian countries. 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. The cross-section from other silkworms can vary in shape and diameter: crescent-like for Anaphe and elongated wedge for tussah. It can be weakened if exposed to too much sunlight. Silk is obtained from silkworms. They do this by hand-reeling the threads onto a wooden spindle to produce a uniform strand of raw silk. However, further research fails to prove clearly the contribution of sericin to inflammatory responses based on isolated sericin and sericin based biomaterials. Appendix A: "Introduction of Silk Cultivation to Khotan in the 1st Century CE," pp. It is known as Resham in eastern and north India, and Pattu in southern parts of India. (a) Silk is a plant fibre.  Following the destructive Mill River Flood of 1874, one manufacturer, William Skinner, relocated his mill from Williamsburg to the then-new city of Holyoke. 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. Q7. Q3. Question 4: From which parts of the plant cotton and jute are obtained? Silk is a natural protein fiber, some forms of which can be woven into textiles. wool, silk; Fibre to Fabric â Question: From which part of the plant cotton and jute are obtained? Silk fibres are obtained from silkworms. It was known as Ganges silk in medieval Europe. Sisal (/ Ë s aÉª s Él /, Spanish: ), with the botanical name Agave sisalana, is a species of flowering plant native to southern Mexico but widely cultivated and naturalized in many other countries.  A technique known as demineralizing allows the mineral layer around the cocoon of wild silk moths to be removed, leaving only variability in color as a barrier to creating a commercial silk industry based on wild silks in the parts of the world where wild silk moths thrive, such as in Africa and South America. A straw frame is placed over the tray of caterpillars, and each caterpillar begins spinning a cocoon by moving its head in a pattern. Can you explain this answer?  The earliest surviving example of silk fabric dates from about 3630 BC, and was used as the wrapping for the body of a child at a Yangshao culture site in Qingtaicun near Xingyang, Henan. It is also obtained from the hair of rabbits, yak and camels. In the Torah, a scarlet cloth item called in Hebrew "sheni tola'at" שני תולעת – literally "crimson of the worm" – is described as being used in purification ceremonies, such as those following a leprosy outbreak (Leviticus 14), alongside cedar wood and hyssop (za'atar).  Other efforts later in the 19th century would also bring the new silk industry to Paterson, New Jersey, with several firms hiring European-born textile workers and granting it the nickname "Silk City" as another major center of production in the United States. Although the lack of detailed characterization of silk fibers, such as the extent of the removal of sericin, the surface chemical properties of coating material, and the process used, make it difficult to determine the real immune response of silk fibers in literature, it is generally believed that sericin is the major cause of immune response. Answer: Ropes; Mats; Question: Explain the process of making yam from fibre. The high proportion (50%) of glycine allows tight packing. b) Animals fibres are silk and wool. There is a surviving calendar for silk production in an Eastern Han (25–220 AD) document. Plant fibres are obtained from _____and_____. The silk fabric is soaked in extremely cold water and bleached before dyeing to remove the natural yellow coloring of Thai silk yarn. The fibres obtained from plants and animals are called as natural fibres such as cotton, wool, silk etc. Eminent scholar and leading medieval translator of Jewish sources and books of the Bible into Arabic, Rabbi Saadia Gaon, translates this phrase explicitly as "crimson silk" – חריר קרמז حرير قرمز. Natural and synthetic silk is known to manifest piezoelectric properties in proteins, probably due to its molecular structure.. Silk's attractive lustre and drape makes it suitable for many furnishing applications. No symbol = official figure, F = FAO estimate,*= Unofficial figure, C = Calculated figure; Good, Irene (December 1995). â¦ Silk is produced by several insects; but, generally, only the silk of moth caterpillars has been used for textile manufacturing. 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. Apart from being the largest Class 7 community, EduRev has the largest solved Question 8: Name wool-yielding animals other than sheep. Silk fibroin contains hydrophobic beta sheet blocks, interrupted by small hydrophilic groups. In England in the mid-20th century, raw silk was produced at Lullingstone Castle in Kent. We get coir from coconut. The fibroin-heavy chain is composed mostly of beta-sheets, due to a 59-mer amino acid repeat sequence with some variations. In the northeastern state of Assam, three different types of indigenous variety of silk are produced, collectively called Assam silk: Muga, Eri and Pat silk. 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. THE JUTE IS MADE TO ROT IN WATER AND THE FIBRE IS REMOVED FROM THE WASTE BY THE PROCESS OF STREPPING AND RETTING .  Silks from Bombyx mori, a kind of cultivated silkworm, are the most widely investigated silks.. Silks were originally reserved for the Emperors of China for their own use and gifts to others, but spread gradually through Chinese culture and trade both geographically and socially, and then to many regions of Asia. , The 7th century CE murals of Afrasiyab in Samarkand, Sogdiana, show a Chinese Embassy carrying silk and a string of silkworm cocoons to the local Sogdian ruler.. over here on EduRev! 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. Its low conductivity keeps warm air close to the skin during cold weather. , Silk moths lay eggs on specially prepared paper. The silkworms and mulberry leaves are placed on trays. (d) Cotton yarn on burning gives an odour similar to that of a burning paper. The process of silk production is known as sericulture. Silk fibre is obtained at which of the following stage of its life cycle?a)b)c)d)Correct answer is option 'C'. Answer: Cotton â Cotton bolls (from the surface of cotton seeds) (fruit) Jute â Stem; Question: Name two items that are made from coconut fibre. Wax or silicone is usually used as a coating to avoid fraying and potential immune responses when silk fibers serve as suture materials. Hemp fibre is obtained from the stems of hemp plant. The Questions and What is oil lamps wick made of?  The flat surfaces of the fibrils reflect light at many angles, giving silk a natural sheen. Silk is a natural protein fiber, some forms of which can be woven into textiles. Jute is a natural plant fibre which is long, soft, shiny that can be spun into coarse strong threads. Question bank for Class 7. Some natural silk structures have been used without being unwound or spun.  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. Write any two things got from coconut fibre. See cited reference for cross-sectional SEM photographs..  Despite the popularity of silk, the secret of silk-making only reached Europe around AD 550, via the Byzantine Empire. 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 . A single thread filament is too thin to use on its own so women combine many threads to produce a thicker, usable fiber. Hyderabad, Andhra Pradesh, and Gobichettipalayam, Tamil Nadu, were the first locations to have automated silk reeling units in India.. 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) linked by a single disulfide bond and a glue-like protein, sericin, comprising 25 to 30 percentage by weight. Silk is produced year-round in Thailand by two types of silkworms, the cultured Bombycidae and wild Saturniidae. Silk is resistant to most mineral acids, except for sulfuric acid, which dissolves it. IT ALSO REQUIRES 90 PERCENTAGE OF WATER THT IS PRESENT IN THE AIR. Cotton; b. Coir; c. Jute; d. Silk; Answer. 1. Silk fibre is drawn from the cocoon of silkworm. Wool and silk fibres are obtained from animals. 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. , ostensibly to discourage tobacco planting yarn is made from fibres community that on! 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