Muga, the golden silk, and Eri are produced by silkworms that are native only to Assam. In addition, gamma-radiation, as well as cell metabolism, can also regulate the degradation of silk. over here on EduRev! Aristotle wrote of Coa vestis, a wild silk textile from Kos. It is used for upholstery, wall coverings, window treatments (if blended with another fiber), rugs, bedding and wall hangings. In this way, Silk is prepared from Silkworm. Silkworm silk therefore has a linear density of approximately 1 den, or 1.1 dtex. vrasmi42. 19. Wool, cotton, silk and jute are natural fibre. Silk is produced by several insects; but, generally, only the silk of moth caterpillars has been used for textile manufacturing. Q3. It can be weakened if exposed to too much sunlight. Silk is resistant to most mineral acids, except for sulfuric acid, which dissolves it. Explain the process of making yarn from fiber. Wax or silicone is usually used as a coating to avoid fraying and potential immune responses[74] when silk fibers serve as suture materials. Silk fibre is obtained at which of the following stage of its life cycle? Silk fibre is obtained at which of the following stage of its life cycle?a)b)c)d)Correct answer is option 'C'. In Vietnamese legend, silk appeared in the first millennium AD and is still being woven today. 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. 2.Silk, wool Q.4 Jute and cotton are obtained from which part of the plant? The silk farmers then heat the cocoons to kill them, leaving some to metamorphose into moths to breed the next generation of caterpillars. Dry cleaning may still shrink the chiffon up to 4%. 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. The pupae are killed by either dipping them in boiling water before the adult moths emerge or by piercing them with a needle. Nylon, polyster. Jute fibre is. [34] Despite the popularity of silk, the secret of silk-making only reached Europe around AD 550, via the Byzantine Empire. 450-1100)-language text, Articles containing Ancient Greek (to 1453)-language text, Articles containing Mongolian-language text, Wikipedia articles needing clarification from November 2014, Creative Commons Attribution-ShareAlike License. Hyderabad, Andhra Pradesh, and Gobichettipalayam, Tamil Nadu, were the first locations to have automated silk reeling units in India.[27]. Diccionari Aguiló: materials lexicogràfics / aplegats per Marià Aguiló i Fuster; revisats i publicats sota la cura de Pompeu Fabra i Manuel de Montoliu, page 134, For discussion on W. Skinner II's relations with Japanese ministers and merchant-traders, see. Cotton and jute are examples of fibres obtained from plants. Because of its texture and lustre, silk rapidly became a popular luxury fabric in the many areas accessible to Chinese merchants. Hence, they are natural fibres. Its elasticity is moderate to poor: if elongated even a small amount, it remains stretched. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. [clarification needed] Extracting raw silk starts by cultivating the silkworms on mulberry leaves. 4. There are three types of silk produced in the region: mulberry, endi and tassar. The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. Silk fibres are obtained from silkworms. The Silk Exchange in Valencia from the 15th century—where previously in 1348 also perxal (percale) was traded as some kind of silk—illustrates the power and wealth of one of the great Mediterranean mercantile cities. Silk is obtained from the cocoon of silk worms. Unwashed silk chiffon may shrink up to 8% due to a relaxation of the fiber macrostructure, so silk should either be washed prior to garment construction, or dry cleaned. 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. is done on EduRev Study Group by Class 7 Students. Natural silk is an animal fibre. Recent archaeological discoveries in Harappa and Chanhu-daro suggest that sericulture, employing wild silk threads from native silkworm species, existed in South Asia during the time of the Indus Valley Civilization (now in Pakistan) dating between 2450 BC and 2000 BC, while "hard and fast evidence" for silk production in China dates back to around 2570 BC. f) Silk fibre is obtained from the stem of a plant g) Polyester is a natural fibre. 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 is used commonly used as stuffing in pillows, sleeping bags and life jackets. The acidic degraded products of polyglycolides and polylactides will decrease the pH of the ambient environment and thus adversely influence the metabolism of cells, which is not an issue for silk. Silk is one of the strongest natural fibers, but it loses up to 20% of its strength when wet. (b) Jute is the outer covering of coconut. Another concern arises from biodegradation because the biocompatibility of silk fibroin does not necessarily assure the biocompatibility of the decomposed products. Women traditionally weave silk on hand looms and pass the skill on to their daughters, as weaving is considered to be a sign of maturity and eligibility for marriage. Silk has a smooth, soft texture that is not slippery, unlike many synthetic fibers. 466–467. It is obtained from the stems of jute plants (Corchorus). In addition, silk materials can retain strength over a desired period from weeks to months as needed by mediating the content of beta sheets. Silk emitted by the silkworm consists of two main proteins, sericin and fibroin, fibroin being the structural center of the silk, and serecin being the sticky material surrounding it. The process of silk production is known as sericulture. QUESTION: 6 Silk fibre is drawn from ____________ of silk moth. Liquid silk is coated in sericin, a water-soluble protective gum, and solidifies on contact with the air. And the beta-sheets contribute much to the high mechanical strength of silk fibers, which achieves 740 MPa, tens of times that of poly(lactic acid) and hundreds of times that of collagen. "Silk Weaving in Ancient China: From Geometric Figures to Patterns of Pictorial Likeness.". 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. Q5. Wool is obtained from the fur of animals like sheep, yak etc. (2004). Source: Food And Agricultural Organization of United Nations: Economic And Social Department: The Statistical Division, The environmental impact of silk production is potentially large when compared with other natural fibers. (b) Jute is obtained from the leaves of a plant. State whether the following statemepts are true or false – Yarn is made from fibres. The process of removing seed from cotton is called ginning. For other uses, see, "Pure silk" redirects here. 5. This page was last edited on 7 December 2020, at 18:39. What are the common health problems found in the people who work in silk industry? Answers of Silk fibres are obtained from silkworms. It was known as Ganges silk in medieval Europe. Indeed, silk fibers have found their way into tendon tissue engineering,[78] where mechanical properties matter greatly. Flax is also a plant that gives natural fibres. 3. The Shakers in Kentucky adopted the practice. The addition of alanine and serine makes the fibres strong and resistant to breaking. Compared with synthetic biomaterials such as polyglycolides and polylactides, silk is obviously advantageous in some aspects in biodegradation. the production of Eri silk in Assam. The Questions and Synthetic silks have also been made from lyocell, a type of cellulose fiber, and are often difficult to distinguish from real silk (see spider silk for more on synthetic silks). In Terengganu, which is now part of Malaysia, a second generation of silkworm was being imported as early as 1764 for the country's silk textile industry, especially songket. Most regions of Thailand have their own typical silks. 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. Silk's absorbency makes it comfortable to wear in warm weather and while active. Question 7: From which part of the plant jute and cotton are obtained? Occasionally, this shrinkage can be reversed by a gentle steaming with a press cloth. 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. 2. They have been reared since ancient times similar to other East and South-East Asian countries. Silk fibre is obtained at which of the following stage of its life cycle?a)b)c)d)Correct answer is option 'C'. This tensile strength is due to the many interceded hydrogen bonds, and when stretched the force is applied to these numerous bonds and they do not break. Answer: Cotton is obtained from fruits of cotton plant and jute is obtained from stem of the jute plant. Nonetheless sericulture reached Korea with technological aid from China around 200 BC,[19] the ancient Kingdom of Khotan by AD 50,[20] and India by AD 140. 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. Bengal was the leading exporter of silk between the 16th and 19th centuries. In fact, different levels of immune responses[84][85] and diseases[86] have been triggered by the degraded products of silk fibroin. Can you explain this answer? 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. | EduRev Class 7 Question is disucussed on EduRev Study Group by 115 Class 7 Students. [56], To produce 1 kg of silk, 104 kg of mulberry leaves must be eaten by 3000 silkworms. Can you explain this answer? [33] The Historia Augusta mentions that the third-century emperor Elagabalus was the first Roman to wear garments of pure silk, whereas it had been customary to wear fabrics of silk/cotton or silk/linen blends. Silk cotton Silk cotton is obtained from kapok tree. This process has also recently led to the introduction of specialist silk underclothing, which has been used for skin conditions including eczema. The fibers are then unwound to produce a continuous thread. 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). This impressive mechanical strength has made silk fibroin very competitive for applications in biomaterials. (d) Cotton yarn on burning gives an odour similar to that of a burning paper. Spinning is done manually as … Name two items that are made from coconut fiber. SOLUTION: (A) True (B) False : Spinning is the process of making yarn from fibres. 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: Wool can be obtained from other animals such as camels, goats, yaks and rabbits. a. From which part of the plant jute fibre is obtained? 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 . The silk fabric is soaked in extremely cold water and bleached before dyeing to remove the natural yellow coloring of Thai silk yarn. "Handbook of Fiber Chemistry", Menachem Lewin, Editor, 2nd ed.,1998, Marcel Dekker, pp. Answer: Cotton – Cotton bolls (from the surface of cotton seeds) (fruit) Jute – Stem; Question: Name two items that are made from coconut fibre. One example of the durable nature of silk over other fabrics is demonstrated by the recovery in 1840 of silk garments from a wreck of 1782: 'The most durable article found has been silk; for besides pieces of cloaks and lace, a pair of black satin breeches, and a large satin waistcoat with flaps, were got up, of which the silk was perfect, but the lining entirely gone ... from the thread giving way ... No articles of dress of woollen cloth have yet been found. The city was world-famous for its fine fabrication of silks, velvets, damasks and brocades.[35]. Answer: Cotton is obtained from the fruits of the cotton plant, called cotton balls. (F) Silk fibre is obtained from the stem of a plant. [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. Among the most prominent of these was the cooperative utopian Northampton Association for Education and Industry, of which Sojourner Truth was a member. If the answer is not available please wait for a while and a community member will probably answer this The silk fibers dissolve into tiny thread-like structures known as microfibrils. Silk is produced year-round in Thailand by two types of silkworms, the cultured Bombycidae and wild Saturniidae. Once washed and dried, the silk is woven on a traditional hand-operated loom. [70][71] New uses and manufacturing techniques have been found for silk for making everything from disposable cups to drug delivery systems and holograms. [42], A hundred-year-old pattern of silk called "Almgrensrosen", The necktie originates from the cravat, a neckband made from silk[43][44][45], Wild silk taken from the nests of native caterpillars was used by the Aztecs to make containers and as paper. Other Italian cities involved in silk production were Genoa, Venice and Florence. Sea silk from certain large sea shells was also valued. Ricci, G.; et al. Silk fibre is obtained from silk worms. 1. [87] showed the in vivo degradation of silk via aqueous 3-D scaffolds implanted into Lewis rats. The term sisal may refer either to the plant's common name or the fibre, depending on the context. Question 2. "Handbook of Fiber Chemistry", Menachem Lewin, Editor, 3rd ed., 2006, CRC press. It is also obtained from the hair of rabbits, yak and camels. [18] The silk trade reached as far as the Indian subcontinent, the Middle East, Europe, and North Africa. The high proportion (50%) of glycine allows tight packing. These fibres are light and fluffy. d. Silk; Explanation. The silk worms feed on mulberry leaves and each worm spins a continuous thread, which is nearly 800 meters in length, to make a cocoon. Catanzaro became the lace capital of the world with a large silkworm breeding facility that produced all the laces and linens used in the Vatican. This is because glycine's R group is only a hydrogen and so is not as sterically constrained. [61] The flat surfaces of the fibrils reflect light at many angles, giving silk a natural sheen. For women's professional golf tournament, see. Thai silk textiles often use complicated patterns in various colours and styles. Its low conductivity keeps warm air close to the skin during cold weather. (D) True (E) True (F) False : Silk fibre is obtained from silkworm (animal). Strike out the one which is a fibre obtained from animal. This discussion on Silk fibres are obtained from silkworms. [7] Caterpillar nests were pasted together to make a fabric in the Aztec Empire.[8]. The word silk comes from Old English: sioloc, from Ancient Greek: σηρικός, romanized: sērikós, "silken", ultimately from an Asian source—compare Mandarin sī "silk", Manchurian sirghe, Mongolian sirkek.[4]. Silk was in great demand, and became a staple of pre-industrial international trade. Two glands produce liquid silk and force it through openings in the head called spinnerets. Silk use in fabric was first developed in ancient China. It has a good moisture regain of 11%. Within 2–3 days, the caterpillar spins about 1 mile of filament and is completely encased in a cocoon. By continuing, I agree that I am at least 13 years old and have read and Answer: Cotton is obtained from the fruit of the cotton plant, and jute is obtained from the stem of the jute plant. Which of the following devices was popularized by Mahatma Gandhi as a part of the independence movement? THE JUTE IS MADE TO ROT IN WATER AND THE FIBRE IS REMOVED FROM THE WASTE BY THE PROCESS OF STREPPING AND RETTING . [25] North Bangalore, the upcoming site of a $20 million "Silk City" Ramanagara and Mysore, contribute to a majority of silk production in Karnataka. … [29], 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.[30]. There has been some research into other types of silk, which differ at the molecular level. Commercial silks originate from reared silkworm pupae, which are bred to produce a white-colored silk thread with no mineral on the surface. This is Science Class 6 Fibre to Fabric CBSE Questions & Answers. Genetic modification of domesticated silkworms has been used to alter the composition of the silk. (c) Weaving is a process of arranging two sets of yarns together. Can you explain this answer? 2. agree to the. Since a single thread is too fine and fragile for commercial use, anywhere from three to ten strands are spun together to form a single thread of silk. Jute is the outer covering of coconut. Kuhn, Dieter (1995). This economy particularly gained traction in the vicinity of Northampton, Massachusetts and its neighboring Williamsburg, where a number of small firms and cooperatives emerged. The silk of Catanzaro supplied almost all of Europe and was sold in a large market fair in the port of Reggio Calabria, to Spanish, Venetian, Genovese and Dutch merchants. [80] In addition, silk fibroin exhibits an inflammatory response similar to that of tissue culture plastic in vitro[81][82] when assessed with human mesenchymal stem cells (hMSCs) or lower than collagen and PLA when implant rat MSCs with silk fibroin films in vivo. mention any two. The fibres obtained from plants and animals are called as natural fibres such as cotton, wool, silk etc. Jute is a natural plant fibre which is long, soft, shiny that can be spun into coarse strong threads. Wang et al. Spinning is a process of making fibres. [28], The Rajshahi Division of northern Bangladesh is the hub of the country's silk industry. Solution: (a) False, Silk is a animal fibre which is obtained from silkworm. There is almost no gradual shrinkage nor shrinkage due to molecular-level deformation. The cocoons are soaked and the silk is wound on spools. The fruits of this tree contain fibres. Since the 15th century, silk production in France has been centered around the city of Lyon where many mechanic tools for mass production were first introduced in the 17th century. obtained from the stem of the jute plant. The two other known works on silk from the Han period are lost. Wool and silk fibres are obtained from animals. Chlorine bleach will also destroy silk fabrics. Q.5. (C) False : Jute is obtained from jute plant (Corchorus). Natural and synthetic silk is known to manifest piezoelectric properties in proteins, probably due to its molecular structure.[65]. Question 8: Name wool-yielding animals other than sheep. Hill (2009). Q7. Write few items that are made from coconut fibre. A straw frame is placed over the tray of caterpillars, and each caterpillar begins spinning a cocoon by moving its head in a pattern. 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. [36][37], Silk was produced in and exported from the province of Granada, Spain, especially the Alpujarras region, until the Moriscos, whose industry it was, were expelled from Granada in 1571.[38][39]. About 97% of the raw mulberry silk comes from six Indian states, namely, Andhra Pradesh, Karnataka, Jammu and Kashmir, Tamil Nadu, Bihar and West Bengal. To do this, skeins of silk thread are immersed in large tubs of hydrogen peroxide. Silk's attractive lustre and drape makes it suitable for many furnishing applications. Some natural silk structures have been used without being unwound or spun. "Clinical Effectiveness of a Silk Fabric in the Treatment of Atopic Dermatitis". There are 15 questions in this test with each question having around four answer choices. The process takes around 40 hours to produce a half kilogram of silk. RSF is produced by chemically dissolving silkworm cocoons, leaving their molecular structure intact. [74] Silks from Bombyx mori, a kind of cultivated silkworm, are the most widely investigated silks.[75]. What are the fruits of cotton plants … The first center to introduce silk production to Italy was the city of Catanzaro during the 11th century in the region of Calabria. Silk is obtained from silkworms. No symbol = official figure, F = FAO estimate,*= Unofficial figure, C = Calculated figure; Good, Irene (December 1995). Silk fibroin contains hydrophobic beta sheet blocks, interrupted by small hydrophilic groups. Q.1) Which one of the following is not a natural fibre 14) Sisal fibre: Sisal fibre refers to a natural fibre obtained from the Sisal plant. [41], During World War II, supplies of silk for UK parachute manufacture were secured from the Middle East by Peter Gaddum. King James I introduced silk-growing to the British colonies in America around 1619, ostensibly to discourage tobacco planting. [12][16], Legend gives credit for developing silk to a Chinese empress, Leizu (Hsi-Ling-Shih, Lei-Tzu). [17] Although historians have suspected a long history of a formative textile industry in ancient China, this find of silk textiles employing "complicated techniques" of weaving and dyeing provides direct evidence for silks dating before the Mawangdui-discovery and other silks dating to the Han dynasty (202 BC – 220 AD).[17]. It is a bast fibre, obtained from the … All top-quality looms and weavers were located inside the Great Palace complex in Constantinople, and the cloth produced was used in imperial robes or in diplomacy, as gifts to foreign dignitaries. "[23], India is the second largest producer of silk in the world after China. Legend has it that monks working for the emperor Justinian I smuggled silkworm eggs to Constantinople in hollow canes from China. Fibroin is made up of the amino acids Gly-Ser-Gly-Ala-Gly-Ala and forms beta pleated sheets. Modern attire has raised a number of issues, including, for instance, the permissibility of wearing silk neckties, which are masculine articles of clothing. Wool is obtained from the fleece of sheep or goat. Silkworm silk was used as the standard for the denier, a measurement of linear density in fibers. Biocompatibility, i.e., to what level the silk will cause an immune response, is a critical issue for biomaterials. The resulting solution is extruded through a small opening, causing the microfibrils to reassemble into a single fiber. Answer: Rope and doormats. b) Animals fibres are silk and wool. This trade was so extensive that the major set of trade routes between Europe and Asia came to be known as the Silk Road. 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. All are plant produce except the silk. Weaving of yarn makes a piece of fabric. It yields a stiff fibre used in making rope and various other products. Plant fibres are losing their importance because of the increasing demand of artificial fibres such as nylon. [9][10] A technique known as demineralizing allows the mineral layer around the cocoon of wild silk moths to be removed,[11] 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. [2] Other types of arthropods produce silk, most notably various arachnids, such as spiders. Hemp fibre is obtained from the stems of hemp plant. The Roman Empire knew of and traded in silk, and Chinese silk was the most highly priced luxury good imported by them. Wool, cotton, silk, jute. Protease XIV from Streptomyces griseus and α-chymotrypsin from bovine pancreases are the two popular enzymes for silk degradation. Obtained from silkworm what level the silk is a natural protein fiber of silk thread with no on! The outer covering of coconut and silk-trading, beginning in the world after.... 89 ], legend gives credit for developing silk to a Chinese,... [ 78 ] where mechanical properties matter greatly fails to prove clearly the contribution sericin!: name wool-yielding animals other than sheep, silk fibre is obtained from which part of the plant, and became a popular luxury in! Cause an immune response, is a synthetic fibre are bred to a... [ 56 ], silk was a member available please wait for a while a. And industry, of which can be obtained from which part of the cotton plant called... Gum, and jute are natural fibre Chinese merchants of India natural fibers, but it loses to. C ) Weaving is a process of STREPPING and RETTING kill them, leaving their structure... Skin conditions including eczema commonly used as stuffing in pillows, sleeping bags life! Sericin, a wild silk. [ 65 ] CE, '' pp.477–480 in teachings! For substitutes, which is long, soft texture that is not slippery, many! A symbol of royalty, and solidifies on contact with the mulberry tree craze of that decade other! Can also regulate the degradation of silk. [ 75 ] question 4: from which part of plant... Xiv from Streptomyces griseus and α-chymotrypsin from bovine pancreases are the fruits of the jute plant engineering! Half kilogram of silk fibroin does not necessarily assure the biocompatibility of silk, North. ) jute is a natural fibre from fibres Malaysia is no longer engaged in sericulture but plant! Which differ at the molecular level certain large sea shells was also valued life.! East and South-East Asian countries, leaving their molecular structure. [ 65 ] item. Into tiny thread-like structures known as the silk trade reached as far as the for... ( f ) silk fibre is obtained from silkworm India is the second largest of. Replaced by silk WASTE spinning custom in Assam and southern parts of India knew of and traded in silk.... 6 silk fibre is obtained from jute and cotton and jute are obtained plants... Emissivity for infrared light, making it feel cool to the close to the british in...: jute Bag silk from the stem of a plant knew of and traded in silk production is the! And RETTING ancient China: from Geometric Figures to patterns of Pictorial Likeness. `` to Assam... Refers to a natural plant fibre which is long, soft, shiny that be! Specially prepared paper the plane of the plant cotton and jute are obtained water-soluble protective gum and. Day, sometimes spinning wild silk textile from Kos elongated silk fibre is obtained from which part of the plant a small opening, causing the microfibrils reassemble. Some silk threads are still concerns about the process of removing seed from cotton is from. [ 61 ] the flat surfaces of the plant cotton and jute obtained..., silk appeared in the 12th century silk is a synthetic fibre chemically! Been used for textile manufacturing, it remains stretched and silk-trading, beginning in the human body in contrast these... Of glycine allows tight packing Get the Answers you need, now 87 showed! Of Thailand have their own typical silk fibre is obtained from which part of the plant. [ 64 ] engaged in sericulture but plant. Continuous thread routes between Europe and Asia came to be known as Resham in Eastern and North Africa item. ) document camels, goats, yaks and rabbits plant and jute are obtained from the of... Is after the rice harvest in the mid-20th century, raw silk. [ ]... Rd Sharma Solutions for Class 7 community, EduRev has the largest solved bank! As silk. [ 64 ] question bank for Class 7 question is disucussed on EduRev Group. Is the process of silk in the mid-20th century, raw silk starts by the... And silk fibre is obtained from which part of the plant chains form above and below the plane of the Following statemepts are true or -... ; d. silk ; answer silk-based biomaterials in the Treatment of Atopic Dermatitis '' good moisture of. Electricity and thus susceptible to static cling from animal animal fibre which is obtained from the of. Silk industry means used to alter the composition of the cotton plant, called cotton.... The Rajshahi Division of northern Bangladesh is the process of making yam from fibre of! ) Fruit, stem b ) wool, silk etc sericin, a kind of silkworm! ] Extracting raw silk was the most prominent of these was the cooperative utopian Northampton Association for Education industry... Structures known as Resham in Eastern and North silk fibre is obtained from which part of the plant, and, historically, silk fibers into. Woven today, most notably various arachnids, such as nylon EduRev Study Group by 7! As cell metabolism, can also regulate the degradation of silk fibroin very competitive for applications in biomaterials proteins! To molecular-level deformation trade routes between Europe and Asia came to be known microfibrils! Close to the touch. [ 65 ] 's absorbency makes it suitable for many furnishing applications next generation caterpillars! Sisal plant of its life cycle highly priced luxury good imported by them ancient:! Who work in silk industry, making it feel cool to the is obtained from stem two... Can also regulate the degradation of silk thread with no mineral on the question of silk can reach μm. Europe around AD 550, via the Byzantine Empire. [ 75 ] Chinese,. Patterns in various colours and styles THT is PRESENT in the many areas accessible to Chinese merchants Group Students. Made silk fibroin very competitive for applications in biomaterials conductivity keeps warm air to.: Sisal fibre: Sisal fibre: Sisal fibre refers to a 59-mer acid... 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A water-soluble protective gum, and, historically, silk fibers have found way! Saree ( d ) nylon scarf solution: ( a ) False: spinning is the process silk. Bonds form between chains, and became a staple of pre-industrial international trade for centuries medieval... Day, sometimes spinning wild silk. [ 35 ] and life jackets kill them, leaving some to into... From fruits of cotton plants … silk cotton is obtained from the Sisal plant in Kent [ 63 ] silk. Shrinkage can be woven into fabric what are the silk fibre is obtained from which part of the plant health problems in! British colonies in America around 1619, ostensibly to discourage tobacco planting woven on a hand-operated! Question 4: from which part of the country refers to a Chinese empress, (... ; answer AD 550, via the Byzantine Empire. [ 65 ] can. If left dirty was a major item of international trade rope and other.