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explain the process of obtaining silk class 7

All questions and answers from the NCERT Book … VERY SHORT ANSWER QUESTIONS. Some animals that live in cold places generally develop a thick coat of hair on their body. The cocoons are kept under the sun or boiled or exposed to steam. Try to go through the solved examples of of the chapter you are reading ; Now it is the time to solve unsolved assignments and worksheets. in mulberry silk worms there are two types of eggs are present (the mulberry silk moth in India can complete five life cycles per year.) Wool is acquired from the fleece or hair of these animals. Ask your question. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon. Step3: The silk thread is then bleached and dyed into many shades. It is the key structural material making up scales, hair, nails, feathers, horns, claws, hooves, calluses, and the outer layer of skin among vertebrates. The rearing of silkworms for obtaining silk is called 6. This process is known as reeling the silk. The under-fur of Kashmiri goat is soft. Silk fibre is made of a protein. Smuggling Silk Once a sheep develops a thick coat of hair, it is shaved off to obtain wool. The hair provides woollen fibres that are then processed to obtain woollen yarn. These coating helps the animals to trap air in it and keep them warm as air is a poor conductor of heat. (iii) Converting silk fibres into silk cloth: Silk fibres obtained from cocoons are spun (twisted) to form silk threads called silk yarn. Our counselor will call to confirm your booking. NCERT Solutions for Class 7 Science Chapter 3 Animal Fibres Wool And Silk are provided here with simple step-by-step explanations. 10.Silkworms secrete fibre made of Silk is a "natural" protein fiber, some forms of which can be woven into textiles.The best-known type of silk is obtained from cocoons made by the larvae of the silkworm Bombyx mori reared in captivity. 10. 5. These solutions for Animal Fibres Wool And Silk are extremely popular among Class 7 students for Science Animal Fibres Wool And Silk Solutions come handy for quickly completing your homework and preparing for exams. Ask your question . (b) spinning of silk fibres. The process of selecting parent sheep for obtaining special characteristics in their offspring (such as soft under-hair) is called ‘selective breeding‘. Write the complete process to obtain the silk fibre from the cocoons? The rearing of silkworms to obtain silk is known as sericulture. In this way, Silk is prepared from Silkworm. The process of taking out threads from the cocoon for use as silk is called reeling the silk. Explanation: Breeding and management of silkworms for obtaining silk are called sericulture. The Cocoons are kept under the sun or boiled or exposed to steam. NCERT Solutions for Class 7 Science Chapter 3 Animal Fibres Wool And Silk are provided here with simple step-by-step explanations. Answered Write the complete process to obtain the silk fibre from the cocoons? UPSC IAS 2020 Exam: Click here to get the Complete 30 Days Study Plan to score high in Prelims. The hair provides woollen fibres that are then processed to obtain woollen yarn. From cocoon to silk → For obtaining silk, moths are reared and their cocoons are collected to get silk threads. Log in. To prepare further for Class 7 Science subject you can get Revision Notes, Important Questions at aglasem.com for free. Class 7 Study Material – Notes, Important Questions, Practice Tests. Step II: The sheared fleece is systematically washed in tanks in order to remove the grease, dust and dirt. Shearing is done with a manual […] Question from very important topics are covered by NCERT Exemplar Class 7.You also get idea about the type of questions and method to answer in your Class 7th examination. | EduRev Class 7 Question is disucussed on EduRev Study Group by 174 Class 7 Students. And further, this silk is used in the manufacture of clothes, etc. 3. Wool is obtained from the fleece (hair) of sheep or yak. What are the common health problems found in the people who work in silk industry? Participate in learning and knowledge sharing. In this process, fibres from a mass of cotton wool are drawn out and twisted. Then the topic of silk begins. Scouring in tanks The rearing of silkworms for obtaining silk is called (a) cocoon (b) silk (c) sericulture . Reeling is also done in special machines. Silk fibre made of How silk is made from silkworm yak How does sericulture done what isrearing 1.What changes take place in the Pupa stage of silkworm? UP Board Exam 2021: Amid COVID-19 Pandemic The Board Might Set A New Record! … Explain why. Fill in … 2. Then the topic of silk begins. The process of taking out threads from the cocoon for use as silk is called reeling the silk. Breeding and management of silkworms for obtaining silk is called as sericulture. It describes the animals that yield wool and the process through which fibres are converted into wool. Step4: The silk fibre is then spun into silk thread, which is then woven into silk cloth by weavers. NCERT Exemplar Problems Class 7 Science Chapter 3 Fibre to Fabric . Process of Obtaining Silk from Silkworm - Chapter 3 - Fiber To Fabric - Science Class 7th NCERT 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. Let's study about silkworm through this article, and how this worm makes silk. The biological scientific name of the silkworm is Bombyx Mori (In Latin mulberry Silkmoth). This process is called reeling. Reeling of silk is (a) a process of making silk reels (b) spinning of silk fibres (c) weaving of silk cloth (d) the process of taking silk threads from cocoon. Cocoon is treated with hot air, steam, or boiling water. NCERT Exemplar for Class 7 Science Chapter 3 Fibre to fabric Multiple Choice Questions 1. Animal fibres are naturally obtained from animals. 3. Every time starts a new test, when you click the button Start a New Test. The process approach can be applied to any organization and any management system regardless of type, size or complexity. How is Silk obtained from silkworms? Explain the steps of processing silk in detail .. urgent, Offered for classes 6-12, LearnNext is a popular self-learning solution for students who strive for excellence. Question from very important topics are covered by NCERT Exemplar Class 7.You also get idea about the type of questions and method to answer in your Class 7th examination. It describes the life history of silk moth and the process of obtaining silk from the cocoon. Silk is a type of natural fiber or animal fiber. Differentiate between the eri silk and other types of silk. Fibre to Fabric Class 7 Extra Questions Science Chapter 3 Fibre to Fabric Class 7 Science Extra Questions Very Short Answer Type Question 1. Obtaining of silk from cocoon: First of all, cocoons are boiled and then silk fiber is separated out; using machines. 1. The rearing of silkworms for obtaining silk is called (a) cocoon (b) silk (c) sericulture (d) silviculture. Clothes made from Silk and other things are liked by everyone because of its texture. Keratin also protects epithelial cells from damage or stress. A pile of cocoons is used for obtaining silk fibres. Question: The process of digestion is a chemical change. Fig. Explain the processing of silk. The process of taking out threads from the cocoon for use as silk is called reeling the silk. Soln: The answer is (c) sericulture. NCERT Solutions For Class 7 Science Chapter 3: This chapter explains the process of obtaining wool and silk. (c) weaving of silk cloth. This makes the silk thread of Koya broken into small pieces. Silk Manufacturing Process Silk is a natural protein fiber produced by certain caterpillars in orderto encase themselves in the form of cocoons. As soon as it comes in contact with the air, this thread solidifies and a silk thread which is about 1000 meters long is formed. air and becomes silk fibre. Q9: Explain the process of making yarn from fibre. Differentiate between the eri silk and other types of silk. Answer: In the process of digestion, the various food materials break down to form new substances which can be absorbed by the body. Log in. Silk is a natural fibre which is obtained from an insect (called silk moth). How is silk produced from silkworm?Do you know that the silkworm survives only for two or three days and the most unique thing is that at the same time, after every sexual contact, female silkworm insulates 300-400 eggs on the leaves of the mulberry tree? (iii) Converting silk fibres into silk cloth: Silk fibres obtained from cocoons are spun (twisted) to form silk threads called silk yarn. Answer: The process of making yarn from fibres is called spinning. Fill in the Blanks Question 1. The soft looking silk yarn is as strong as a comparable thread of steel. It provides the complete revision for 7th Science Chapter 3. Silk is an animal fibre, which is obtained from silkworms that live on mulberry trees. Their diet of continually eating mulberry leaves results in a semi-liquid protein called fibroin. Ask your question. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 7.. Hatching of eggs: After 10 days of incubation, the eggs are hatched into larvae called the caterpillar.

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