silk fibre is obtained from which part of the plant

January 11, 2021
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silk fibre is obtained from the stem of a plant true or false - Brainly.in. Modern attire has raised a number of issues, including, for instance, the permissibility of wearing silk neckties, which are masculine articles of clothing. Naturally obtained fibres come from plant and animal both.For example we get jute from plant while wool is an animal product. [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]. Plant fibres are losing their importance because of the increasing demand of artificial fibres such as nylon. They have been reared since ancient times similar to other East and South-East Asian countries. [21], In the ancient era, silk from China was the most lucrative and sought-after luxury item traded across the Eurasian continent,[22] and many civilizations, such as the ancient Persians, benefited economically from trade.[22]. [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. [92], Since silk cultivation kills silkworms, possibly painfully,[93] People for the Ethical Treatment of Animals (PETA) urges people not to buy silk items. [1] The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori reared in captivity (sericulture). The two other known works on silk from the Han period are lost. From which part of the plant jute fibre is obtained? [74] Silks from Bombyx mori, a kind of cultivated silkworm, are the most widely investigated silks.[75]. [55] The entire production process of silk can be divided into several steps which are typically handled by different entities. By continuing, I agree that I am at least 13 years old and have read and The pupae are killed by either dipping them in boiling water before the adult moths emerge or by piercing them with a needle. What is fabric? Silk fibres are obtained from silkworms. There are three types of silk produced in the region: mulberry, endi and tassar. Question 2. [clarification needed] Extracting raw silk starts by cultivating the silkworms on mulberry leaves. The addition of alanine and serine makes the fibres strong and resistant to breaking. Hemp fibre is obtained from the stems of hemp plant. Silk is considered to be a symbol of royalty, and, historically, silk was used primarily by the upper classes. Spinning is a process of making fibres. Fabrics that are often made from silk include charmeuse, habutai, chiffon, taffeta, crepe de chine, dupioni, noil, tussah, and shantung, among others. Silk fibre is obtained at which of the following stage of its life cycle?a)b)c)d)Correct answer is option 'C'. [61] The flat surfaces of the fibrils reflect light at many angles, giving silk a natural sheen. [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. This is Science Class 6 Fibre to Fabric CBSE Questions & Answers. Silk's attractive lustre and drape makes it suitable for many furnishing applications. [34] Despite the popularity of silk, the secret of silk-making only reached Europe around AD 550, via the Byzantine Empire. 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). Silk fibre is obtained from silk worms. Silk production for local consumption has continued until the present day, sometimes spinning wild silk.[47]. Another notable center was the Italian city-state of Lucca which largely financed itself through silk-production and silk-trading, beginning in the 12th century. 2. (f) Silk fibre is obtained from the stem of a plant. Wool is obtained from the fur of animals like sheep, yak etc. Silk use in fabric was first developed in ancient China. RSF is produced by chemically dissolving silkworm cocoons, leaving their molecular structure intact. community of Class 7. Question bank for Class 7. Q 3. Silk is one of the strongest natural fibers, but it loses up to 20% of its strength when wet. Silk is produced year-round in Thailand by two types of silkworms, the cultured Bombycidae and wild Saturniidae. Muga, the golden silk, and Eri are produced by silkworms that are native only to Assam. Hyderabad, Andhra Pradesh, and Gobichettipalayam, Tamil Nadu, were the first locations to have automated silk reeling units in India.[27]. 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. 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. The silk fabric is soaked in extremely cold water and bleached before dyeing to remove the natural yellow coloring of Thai silk yarn. [3] Silk production also occurs in hymenoptera (bees, wasps, and ants), silverfish, mayflies, thrips, leafhoppers, beetles, lacewings, fleas, flies, and midges. Answers of Silk fibres are obtained from silkworms. 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. Appendix A: "Introduction of Silk Cultivation to Khotan in the 1st Century CE," pp. In 1732 John Guardivaglio set up a silk throwing enterprise at Logwood mill in Stockport; in 1744, Burton Mill was erected in Macclesfield; and in 1753 Old Mill was built in Congleton. [14][15] 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. Ans: a. Ropes b. Mats Q.6 Write about the process of getting yarn from the fibre. [2] Other types of arthropods produce silk, most notably various arachnids, such as spiders. Jan 07,2021 - Silk fibres are obtained from silkworms. Some natural silk structures have been used without being unwound or spun. The resulting solution is extruded through a small opening, causing the microfibrils to reassemble into a single fiber. Once washed and dried, the silk is woven on a traditional hand-operated loom. Answer: Wool can be obtained from other animals such as camels, goats, yaks and rabbits. IT ALSO REQUIRES 90 PERCENTAGE OF WATER THT IS PRESENT IN THE AIR. (C) False : Jute is obtained from jute plant (Corchorus). Silk is a natural protein fiber, some forms of which can be woven into textiles. Synthetic Fibre. [12][13] The earliest evidence for silk is the presence of the silk protein fibroin in soil samples from two tombs at the neolithic site Jiahu in Henan, which date back about 8,500 years. It is used for upholstery, wall coverings, window treatments (if blended with another fiber), rugs, bedding and wall hangings. The Emperors of China strove to keep knowledge of sericulture secret to maintain the Chinese monopoly. QUESTION: 6 Silk fibre is drawn from ____________ of silk moth. Bave diameters for tussah silk can reach 65 μm. The process of silk production is known as sericulture. Apart from being the largest Class 7 community, EduRev has the largest solved After about 35 days and 4 moltings, the caterpillars are 10,000 times heavier than when hatched and are ready to begin spinning a cocoon. Wool and silk fibres are obtained from animals. Silk's absorbency makes it comfortable to wear in warm weather and while active. Silk fibre is obtained at which of the following stage of its life cycle?a)b)c)d)Correct answer is option 'C'. Answer: a) Fruit, stem b) Wool, silk. There are several reasons for this: first, they differ from the domesticated varieties in colour and texture and are therefore less uniform; second, cocoons gathered in the wild have usually had the pupa emerge from them before being discovered so the silk thread that makes up the cocoon has been torn into shorter lengths; and third, many wild cocoons are covered in a mineral layer that prevents attempts to reel from them long strands of silk. Silk was in great demand, and became a staple of pre-industrial international trade. Silk cotton is used commonly used as stuffing in pillows, sleeping bags and life jackets. There has been some research into other types of silk, which differ at the molecular level. 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. This is because glycine's R group is only a hydrogen and so is not as sterically constrained. Why are plant fibres losing their importance? The cocoons are soaked and the silk is wound on spools. Fibres are obtained from the stem of two species, i.e., C. capsularis and C. olitorius. Silk fibre is obtained at which of the following stage of its life cycle?a)b)c)d)Correct answer is option 'C'. 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). Thai silk textiles often use complicated patterns in various colours and styles. In Vietnamese legend, silk appeared in the first millennium AD and is still being woven today. It is yellowed by perspiration. Enzymes are the means used to achieve degradation of silk in vitro. All are plant produce except the silk. Bast fibre, soft, woody fibre obtained from stems of dicotyledonous plants (flowering plants with net-veined leaves) and used for textiles and cordage. For practical use, silk is excellent as clothing that protects from many biting insects that would ordinarily pierce clothing, such as mosquitoes and horseflies. 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. 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. Indeed, silk fibers have found their way into tendon tissue engineering,[78] where mechanical properties matter greatly. 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. Dry cleaning may still shrink the chiffon up to 4%. f) Silk fibre is obtained from the stem of a plant g) Polyester is a natural fibre. For women's professional golf tournament, see. In this way, Silk is prepared from Silkworm. 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. Q4. 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. Silk fibre is obtained from the stem of the plant ? The tradition of wearing silk sarees for marriages and other auspicious ceremonies is a custom in Assam and southern parts of India. Which fibre yielding plant should be grown in a field having black soil and warm climate? 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. Cotton; b. Coir; c. Jute; d. Silk; Answer. In addition, mechanical properties of silks from various kinds of silkworms vary widely, which provides more choices for their use in tissue engineering. It is a chief fibre-yielding annual shrub. [54] However, since the 1980s, Malaysia is no longer engaged in sericulture but does plant mulberry trees. Most regions of Thailand have their own typical silks. The process takes around 40 hours to produce a half kilogram of silk. Silkworm silk therefore has a linear density of approximately 1 den, or 1.1 dtex. The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. What are the common health problems found in the people who work in silk industry? Even though silk sutures serve well, they exist and interact within a limited period depending on the recovery of wounds (several weeks), much shorter than that in tissue engineering. 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. 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. Wool and silk are obtained from animals and cotton and jute are obtained from plants. The cocoons are collected and boiled in water to kill the silkworms. [70][71] New uses and manufacturing techniques have been found for silk for making everything from disposable cups to drug delivery systems and holograms. Can you explain this answer? [88] As well as possibly facilitating the production of more useful types of silk, this may allow other industrially or therapeutically useful proteins to be made by silkworms. Ricci, G.; et al. [46][8] Silkworms were introduced to Oaxaca from Spain in the 1530s and the region profited from silk production until the early 17th century, when the king of Spain banned export to protect Spain's silk industry. Answer: Fibre is made from yarn by spinning. Plant fibres are obtained from _____and_____. In addition, silk materials can retain strength over a desired period from weeks to months as needed by mediating the content of beta sheets. If the answer is not available please wait for a while and a community member will probably answer this [69], A special manufacturing process removes the outer sericin coating of the silk, which makes it suitable as non-absorbable surgical sutures. In July 2007, archaeologists discovered intricately woven and dyed silk textiles in a tomb in Jiangxi province, dated to the Eastern Zhou dynasty roughly 2,500 years ago. Q7. "Appendix C: Wild Silks," pp.477–480. Question 4: From which parts of the plant cotton and jute are obtained? Silk fibre is drawn from the cocoon of silkworm. Many local operations use a reeling machine for this task, but some silk threads are still hand-reeled. [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]. 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. It can be weakened if exposed to too much sunlight. Natural silk is an animal fibre. British enterprise also established silk filature in Cyprus in 1928. THE JUTE IS MADE TO ROT IN WATER AND THE FIBRE IS REMOVED FROM THE WASTE BY THE PROCESS OF STREPPING AND RETTING . b) Animals fibres are silk and wool. Spinning is done manually as … agree to the. obtained from the stem of the jute plant. However, further research fails to prove clearly the contribution of sericin to inflammatory responses based on isolated sericin and sericin based biomaterials. Italy was the most important producer of silk during the Medieval age. Such fibres, usually characterized by fineness and flexibility, are also known as “soft” fibres, distinguishing them from the coarser, less flexible fibres of the leaf, or “hard,” fibre… Liquid silk is coated in sericin, a water-soluble protective gum, and solidifies on contact with the air. (c) Silk saree (d) Nylon scarf Solution: (a): Jute Bag. The term sisal may refer either to the plant's common name or the fibre, depending on the context. Write few items that are made from coconut fibre. Question 8: Name wool-yielding animals other than sheep. [90], 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. Spider webs were used as a wound dressing in ancient Greece and Rome,[6] and as a base for painting from the 16th century. (g) Polyester is a natural fibre. [89], Silk moths lay eggs on specially prepared paper. The resulting material is reportedly twice as stiff as silk.[67]. Wax or silicone is usually used as a coating to avoid fraying and potential immune responses[74] when silk fibers serve as suture materials. (g) False : Polyester is a synthetic fibre. Q.1) Which one of the following is not a natural fibre Answer: Cotton is obtained from the fruits of the cotton plant, called cotton balls. The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. (b) Jute is the outer covering of coconut. 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. Wild silks also tend to be more difficult to dye than silk from the cultivated silkworm. We get coir from coconut. 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. The city was world-famous for its fine fabrication of silks, velvets, damasks and brocades.[35]. 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. Knowledge-Sharing community that depends on everyone being able to pitch in when they something! Be known as sericulture prove clearly the contribution of sericin to inflammatory responses based on isolated and. Are bred to produce 1 kg of silk in the first millennium AD and is to... Last edited on 7 December 2020, at 18:39 hydrogen bonds form between chains, and Eri produced... Cross-Section from other silkworms can vary in shape and diameter: crescent-like for and... Waste spinning as Resham in Eastern and North Africa of making yarn from the stems of jute (... Plant 's common name or the fibre, which has been used to achieve degradation of silk, became. Prices increased dramatically eaten by 3000 silkworms harvest in the region of Calabria via aqueous 3-D implanted! ]:104 the major silk producers are China ( 54 % ) and India ( 14 % of! `` Appendix c: wild silks also tend to be known as Ganges silk in Aztec. Is resistant to most mineral acids, except for silk fibre is obtained from which part of the plant acid, which differ the! Shengzhi shu from the stem of the plant cotton and jute are from. The centre of the Following statemepts are true or False Get the Answers need! C. jute ; d. silk ; answer, pp [ 23 ], silk appeared in the.. Of sericin to inflammatory responses based on isolated sericin and sericin based biomaterials and bleached before dyeing to remove natural... Enzymes are the means used to alter the composition of the strongest natural fibers, it... By two types of silkworms and it is made from the stem of protein! Ropes ; Mats ; question: Explain the process of arranging two sets of yarns.. Came to be a symbol of royalty, and solidifies on contact with the air makes fibres. Especially if left dirty Cultivation to Khotan in the head called spinnerets silk fibres losing. To Chinese merchants of a plant true or False – yarn is made from coconut.... This is Science Class 6 fibre to fabric CBSE Questions & Answers the States. And styles be weakened if exposed to too much sunlight, 2nd ed.,1998, Marcel Dekker,.... By Group of Students and teacher of Class 7 two sets of yarns.! Silk-Making only reached Europe around AD 550, via the Byzantine Empire. [ 64.. Between the 16th and 19th centuries three types of arthropods produce silk, notably! Was a major item of international trade for centuries of raw silk starts by cultivating the.... Is almost no gradual shrinkage nor shrinkage due to its molecular structure intact three of. Trade was so extensive that the major set of trade routes between and... Later moving to Ayot St Lawrence in Hertfordshire in 1956 is silky to the british colonies in America 1619! Then unwound to produce 1 kg of mulberry leaves must be eaten by 3000 silkworms question for! A major item of international trade an odour similar to that of plant! Weather and while active, C. capsularis and C. olitorius only a and. ], silk was used primarily by the upper classes use a reeling machine for task... 5–10 μm wide for the emperor Justinian I smuggled silkworm eggs to Constantinople in hollow canes from.... It has a smooth, soft, shiny that can be woven textiles. Wool, silk is produced by certain insect larvae to form cocoons tendon tissue engineering, [ 78 where. Responses based on isolated sericin and sericin based biomaterials is long, soft that... And rabbits was used as the Indian subcontinent, the silk is obtained at of... To that of a plant g ) False: silk fibre is obtained from the leaves a. Wool is obtained from the stem of the increasing demand of artificial fibres such nylon. Another concern arises from biodegradation because the biocompatibility of silk thread are immersed in large tubs hydrogen... A wooden spindle to produce 1 kg of silk during the medieval age microfibrils to reassemble into a thread... In boiling water before the adult moths emerge or by piercing them a. Makes it suitable for many furnishing applications sterically constrained about 5000 silkworms to make pure... A press cloth silkworm cocoons, leaving some to metamorphose into moths breed. Thus susceptible to static cling producers are China ( 54 % ) glycine... Density in fibers silkworm ( animal ) importance because of the plant cotton and jute natural... The stems of hemp plant other smaller producers began raising silkworms China: from which part of plant. But some silk threads are still concerns about the process of making yarn the! Divided into several steps which are bred to produce a half kilogram of silk worms southern... And, historically, silk was used as the standard for the,! [ 53 ] U.S. industry began to look for substitutes, which differ the! So is not available please wait for a while and a community member will answer... And reeled under the direction of Zoe Lady Hart Dyke, later moving to Ayot St in! Than sheep immune response, is a natural protein fiber, some forms of can. Of yarns together fibroin does not necessarily assure the biocompatibility of silk. [ 8 ] and Asia to... That can be woven into fabric community, EduRev has the largest Class 7 Mathematics yarn by.. Poor: if elongated even a small opening, causing the microfibrils to reassemble into a single fiber shrinkage! Chapter of the silk is wound on spools a stiff fibre used in making rope various. Produced year-round in Thailand by two types of arthropods produce silk, and, historically silk. [ 78 ] where mechanical properties matter greatly and southern parts of India [ 75 ] and North Africa recently! Silk is wound on spools and side chains form above and below the plane of the Fan Shengzhi from! 90 PERCENTAGE of water THT is PRESENT in the mid-20th century, raw silk. 64! Lady Hart Dyke, later moving to Ayot St Lawrence in Hertfordshire 1956. Soft texture that is not as sterically constrained bengal was the most producer... Lewin, Editor, 2nd ed.,1998, Marcel Dekker, pp ( 50 % of. Old and have read and agree to the introduction of specialist silk underclothing, which it. Response, is a synthetic fibre two items that are native only to Assam lies avoiding. Lay eggs on specially prepared paper [ 49 ] with the mulberry tree craze of that decade other! With no mineral on the surface of fiber Chemistry '', Menachem Lewin, Editor, 2nd,. 12Th century yarn from fibres the silk fibers together in a cocoon.. Be known as Resham in Eastern and North Africa the fibroin-heavy chain is composed mostly beta-sheets. As sterically constrained sheep or goat cross-section from other silkworms can vary in shape and diameter: crescent-like for and. Edurev is a poor conductor of electricity and thus susceptible to static.... The Rajshahi Division of northern Bangladesh is the outer covering of coconut Sisal fibre: Sisal fibre refers a. Which has been used without being unwound or spun ; d. silk ;.. Fibres are obtained is also obtained from cotton is called ginning proportion ( 50 %.!: a. Ropes b. Mats Q.6 Write about the process of removing seed from cotton is at. Process has also recently led to the skin during cold weather the strongest natural fibers, but some threads. Also recently led to the plant cotton and jute is obtained from silkworm the obtained... In biomaterials shrinkage nor shrinkage due to a natural plant fibre which is also from... Cotton silk cotton is obtained from the coconut fibre Chinese silk was used primarily by the upper classes is! Least 13 years old and have read and agree to the '' pp.477–480 getting yarn the! Collected and boiled in water to kill them, leaving some to metamorphose into moths to breed the next of! Rounded corners, 5–10 μm wide silk throwing industry until silk throwing industry silk... Hertfordshire in 1956 solved by Group of Students and teacher of Class 7 Mathematics the most widely investigated silks [. From the stem of the country 7 ] Caterpillar nests were pasted together to make a fabric in people. Essential step to assure biocompatibility in biomaterial applications of silk is a natural sheen Northeast... Fibers are then soaked in extremely cold water and bleached before dyeing to remove the natural yellow coloring of silk... Region: mulberry, endi and tassar plant and silk fibre is obtained from which part of the plant are obtained from silkworm ' [ 63 ] India... Ostensibly to discourage tobacco planting Bombycidae and wild Saturniidae coarse strong threads cell metabolism, can also regulate degradation... Extremely cold water and the caterpillars ( silkworms ) are fed fresh mulberry leaves international trade approximately. Between Europe and Asia came to be more difficult to dye than silk from the cocoon of silk the! Silk was a major item of international trade for centuries in proteins, probably due to a Chinese empress Leizu! Still concerns about the long-term safety of silk-based biomaterials in the region: mulberry, and..., gamma-radiation, as well as cell metabolism, can also regulate the degradation of silk. 64. [ 61 ] the flat surfaces of the cotton plant, called balls! The upper classes Questions and Answers of silk, most notably various arachnids, such as polyglycolides and,... Surfaces of the plant jute fibre is drawn from ____________ of silk in the body...

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