Still, the ones in the wild are more adaptive to nature compared to the domestic ones. (a) selecting the offsprings with desired properties Perhaps the best-known of these larvae are the mulberry silkworm Bombyx mori which are raised in captivity for their silk fiber (sericulture). Silkworms spin composites of two silk fibers out of two converging silk glands. (a) Removal of fleece is called sheep shearing, separating hair of different textures is called sorting, washing wool to remove grease is called scouring and rolling of sheep fibre into yarn is called rolling. Paheli went to the market to buy sarees for her mother. Note Yak are found in Tibet and Ladakh, while angora goats are reared in Jammu and Kashmir. Answer: It first weaves a covering to hold itself which is known as (g)………….. (d) silviculture Answer: (c) Sericulture is a practice of rearing silkworms for obtaining silk while silviculture is a practice of developing and caring forests Question 2: Which… (a) female  (b) eggs   (c) larvae (d) caterpillars (e) silkworm   (f) pupa (g) cocoon. Question 9: Reeling of silk is. (v) Dyeing The fibres are dyed in various colours, as the original colours of fleece are usually black, white or brown. 9. Answer: Grab the latest working Silkworm coupons, discount codes and promos. Question 25: The life-cycle of a silk worm (c) making silk fabric from silk yarn. Silk fibre can be (c) False, it is called sericulture, silviculture is caring and developing forests. Class 7 Science Chapter 3 MCQ (Multiple Choice Questions) of Fibre to Fabric. (a) fat Match the items of Column I with the items given in Column II. Answer: Question 17: (d) REELING. Caterpillars continue to spin silk fibre till they completely get covered by these fibres. So, the air trapped in hair (or wool) of these animals prevents their body heat from being lost to cold surroundings and keeps them warm. Nylon is a synthetic fibre. Silkworm silk is another protein-based fiber produced naturally by the silkworm, B. Mori or other varieties of moth, and it is the only naturally and commercially produced continuous filament. (d) the process of taking silk threads from cocoon. Silkworm silk fiber is composed of a fibroin core and a sericin casing, and is relatively rigid because the sericin causes the filaments to adhere to one another. The process of taking silk threads from cocoon. (c) making silk fabric from silk yarn. (b) spinning of silk fibres. The GM silkworms secrete fibres made of spider web protein (spider silk), which is stronger than normal silk fibre protein. (b) SILKWORM Bombyx mori, the domestic silk moth, is an insect from the moth family Bombycidae.It is the closest relative of Bombyx mandarina, the wild silk moth.The silkworm is the larva or caterpillar of a silk moth. They found that as the water level lowered, tiny islands of solid proteins began to form. Answer: D. Question 10: Silkworms secrete fibre made of. The term sericulture is used for This silk covering in which a silkworm … Answer: The correct order is Question 18: (c) Shearing (a) _____ and _____ fibres are obtained from animals. Fat and cellulose are not present in silk. Answer: Write them in their correct form. (c) Sericulture is a practice of rearing silkworms for obtaining silk while silviculture is a practice of developing and caring forests. (b) hen certain desired traits (properties) of parents are considered before breeding, it is called selective breeding. Answer: (b) Llama The most common variety of silk is – (a) Tussar silk (b) Kota silk (c) Mulberry silk (d) Mooga silk iv. Fleece of sheep gives wool, cotton ball gives cotton and jute stalk gives jute fibre. Answer: Mulberry, Tassar and Mooga are varieties of silk produced by different rearing practices. (c) Wool yielding animals bear________ on their body. Periods between moults are known as silkworm instars. Question 11: Fill in the blanks in … (c) MULBERRY (d) In the process of obtaining wool from fleece, sorting is done after scouring. Question 12: If the proteins were to become solid too soon in silk-producing animals, they could permanently block the spinning system, with potentially fatal results. (c) making silk fabric from silk yarn (a) Rest of the options given here are obtained by killing animals, but wool is produced from shearing of skin of sheep. The (a)……… silk moth lays (b)……… from which hatch (c)……….. called (c) Cocoon is one of the stage of life cycle of silkworm. The eggs hatch to form larvae called ‘caterpillar’ or ‘silkworms’. Nylon is a synthetic fibre. Air is a poor conductor of heat. (d) Reeling of silk is the process of taking out threads from the cocoon for use as silk. (b) cellulose Selective breeding is a process of (a) Goat According to the report, the silk proteins fold in on themselves and arrange their hydrophobic and hydrophilic parts such that they remain soluble prior to being spun. Pupa develop inside cocoon into moth and comes out as an adult male or female silk moth. This silk covering in which a silkworm … How do the hair of certain animals help in keeping their bodies warm? (d) Hair trap a lot of________ which is a poor_________ of heat. The silkworms secrete an excellent filament made of fibroin protein from 2 glands on its head, hardening after exposure to air, and becoming silk fibers. The general process that takes place at a sheep shearing shed is The life cycle of silk moth is completed in four main stages as depicted below in the diagram: NCERT Exemplar Problems Class 7 Science – Fibre to Fabric Question 1: The rearing of silkworms for obtaining silk is called (a) cocoon (b) silk (c) sericulture . A fiber can be of two types: natural fiber and synthetic fiber. Through the ages of domestication, they lost their natural ability to hunt for food and to defend themselves from predators making their life expectancy very low if not given proper care… Caterpillars continue to spin silk fibre till they completely get covered by these fibres. Question 14: Some of these letters in each ring can form the name of one wool yielding animal. (a) Picking out the burrs Introduction: Silk is a natural protein fiber, produced by insect larvae to form cocoons. Match the items in Column I with the woollen fibre in Column II. (a) Silkworms are caterpillars of silk moth. If false, correct them. (c) BELMURRY Question 20: These silk-producing glands secrete a clear liquid that hardens into a thin silk thread when it comes into contact with air. This stage of the silkworm’s lifecycle lasts for about 24-33 days. Which of the following would be the right gift for her to buy? They are the smallest visible unit of a fabric and denoted by being extremely long in relation to their width. (d) production of sarees Question 15: Answer: (d) rolling of sheep fibre into yarn Silk fibre is obtained from fat; cellulose; protein; nylon; Answer. Ancient literature, however, attributes the popularization of silk to the Chinese Empress Si-Ling, to around 2600 B.C. Fill in the blanks in the following statements. Wool fibre cannot be obtained from which of the following? (b) spinning of silk fibres. Question 9: Fat. History of silk: Around 3500 BC, silk was discovered in China during the reign of emperor Huang-ti. Silkworms secrete fibre made of … Arrange them in their proper sequence. In second saree, second thread which burnt with the smell of burning paper is from a cotton saree. 10. Comprised of a natural protein fiber, silk mainly consists of fibroin, which is a protein that certain types of insect larvae secrete to make cocoons. Now they are one step closer to understanding just how the creature manages the feat. (b) spinning of silk fibres Soln: The answer is (c) protein. Notes Kaplan, "this finding could lead to the development of processing methods resulting in new high-strength and high-performance materials used for biomedical applications, and protective apparel for military and police forces.". As the eggs hatch, they form worm like larvae. Examples of natural fibers are cotton and silk whereas examples of synthetic fibers are: nylon, polyester, etc. Called the Goddess of the Silkworm, Si-Ling apparently raised … Silkworms secrete fibre made of GC Fibres Polymers Silkworms secrete fibre made of. 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silkworm secrete fibre made of dash

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