Join now. Nobles and kings of foreign lands desired silk and would pay high prices for the cloth. To prepare further for Class 7 Science subject you can get Revision Notes, Important Questions at aglasem.com for free. Soln: Answer is (d) the process of taking silk threads from cocoon. Hope you like them and do not forget to like , social share and comment at the end of the page. Then the topic of silk begins. navneetkumar165 navneetkumar165 26.07.2020 Science Primary School +5 pts. Sheep are usually shorn annually in the spring/summer months. 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.) Students who are in Class 7 or preparing for any exam which is based on Class 7 Science can refer NCERT Science Book for their preparation. Name the sources of obtaining fibres. So this page contains notes of most of the class 7 chapters and we also have assignments of most of the chapters that you can practice. Source: www.inserco.org.comUsually, in 12 to 15 days, Pupa becomes a silkworm (Imago) by transplantation, which, with the help of an alkaline secretion cut the Koya from one side and comes out. Solution: (d) The process of unwinding the silk filaments from the cocoon and combining them together to make a thread of raw silk … What is a larva ? - Silk was first discovered in China.- India is the only country to produce all five known commercial varieties of silk (Mulberry, Tropical Tasar, Oak Tasar, Eri, and Coral). The process of taking out threads from the cocoon for use as silk is called _____ the silk. Step 5: Spinning. Animal fibres are naturally obtained from animals. Access Answers of NCERT exemplar for Class 7 Science Chapter 3- Fibre to Fabric Multiple Choice Questions. 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. Soln: The answer is (c) sericulture. Step 4: Dyeing. What are the common health problems found in the people who work in silk industry? VERY SHORT ANSWER QUESTIONS. Let's study about silkworm through this article, and how this worm makes silk. It provides the complete revision for 7th Science Chapter 3. This process is called reeling. Fig. Multiple Choice Questions (MCQs) Question 1: The rearing of silkworms for obtaining silk is called (a) cocoon (b) silk (c) sericulture . Step II: The sheared fleece is systematically washed in tanks in order to remove the grease, dust and dirt. Class 7 Chemistry Fibre to Fabric: Processing fibres into wool: Processing fibres into wool . Answer: The sources of obtaining fibres are plants and animals. Reeling of silk is (a) a process of making silk reels. Ask your question. Question 2. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon. 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. Mounting: Mounting is the process of transferring the ripe worms to the mountages. Wool is acquired from the fleece or hair of these animals. 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. The cocoon are kept under the sun, boiled water or exposed to steam. Rearing of silks is called sericulture.Degummed fibers from B. mori are 5-10 μm in diameter. So, the process of digestion is a chemical change. NCERT Solutions For Class 7 Science Chapter 3: This chapter explains the process of obtaining wool and silk. (c) weaving of silk cloth. Nobles and kings of foreign lands desired silk and would pay high prices for the cloth. In a span of 10 days, each and every egg produces a small female insect called larvae also known as Caterpillar. NCERT Exemplar for Class 7 Science Chapter 3 Fibre to fabric Multiple Choice Questions 1. 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. α-Keratin is a type of keratin found in vertebrates. Dye silk thread in a dye bath. Class 7 Study Material – Notes, Important Questions, Practice Tests. Do you know which part of the sheep’s body yields fibres? The rearing of silkworms to obtain silk is known as sericulture. Silk was even used as money during some Ancient Chinese dynasties. 4. By continuing to use our website, you agree to our, Do you know about the ‘Plastic-eating’ fungus discovered in Pakistan. Spinning is done at home using simple devices like hand spindle (Takli) and charkha. Once a sheep develops a thick coat of hair, it is shaved off to obtain wool. It provides the complete revision for 7th Science Chapter 3. Usually, the insects spin a cocoon around them at the start of winter and spend the entire season inside the cocoon without the need for food and water. Silk is produced by this insect. What is a larva ? Participate in learning and knowledge sharing. Keeping Silk a Secret Silk became a prized export for the Chinese. Anyone caught telling the secret or taking silkworms out of China was put to death. A fiber can be of two types: natural fiber and synthetic fiber. Silk fibres are converted into silk yarn which is used for making silk cloth. This covering is known as cocoon . The rearing of silkworms for obtaining silk is called 6. Ask your question. (c) weaving of silk cloth. 1. 2.2 With the help of an activity, can you show the process of weaving? And further, this silk is used in the manufacture of clothes, etc. THE PROCESS APPROACH IN ISO 9001:2015 Purpose of this paper The purpose if this paper is to explain the process approach in ISO 9001:2015. 11. Obtaining of silk from cocoon: First of all, cocoons are boiled and then silk fiber is separated out; using machines. This makes the silk thread of Koya broken into small pieces. Process of Obtaining Silk from Silkworm - Chapter 3 - Fiber To Fabric - Science Class 7th NCERT The world's first practice of silk production was started in China. The soft looking silk yarn is as strong as a comparable thread of steel. This section contains Class 6 Science Chapter 3 Extra Questions and important Keywords. What is the process approach? Question: Write a caption for each of the figures given as figure (a-d). To produce weighted silk, metallic substances are added to the fabric during the dying process. n Class VI you have learnt about some fibres obtained from plants. The silk fibres separate out. Silk is then obtained from this net. Answered Write the complete process to obtain the silk fibre from the cocoons? Every time starts a new test, when you click the button Start a New Test. The cocoon helps the worm to stay protected from the harsh and unfriendly weather conditions. Process of Obtaining Silk from Silkworm - Chapter 3 - Fiber To Fabric - Science Class 7th NCERT (b) spinning of silk fibres. The rearing of silkworms for obtaining silk is called (a) cocoon (b) silk (c) sericulture (d) silviculture Soln: Answer is (c) sericulture Explanation: Breeding and management of silkworms for obtaining silk is … And then, weave silk by hand loom or power loom. Wool is obtained from the fleece (hair) of sheep or yak. | EduRev Class 7 Question is disucussed on EduRev Study Group by 174 Class 7 Students. Step2: Reeling the silk, which is the process of delicately unwinding the fibre from the cocoon. This is known as scouring. In this way, Silk is prepared from Silkworm. Explain why. Machine unwinds the silk thread from cocoons. How is Silk obtained from silkworms? Log in. (iii) Converting silk fibres into silk cloth: Silk fibres obtained from cocoons are spun (twisted) to form silk threads called silk yarn. Silkworm is an insect that makes silk. Reeling of silk is (a) a process of making silk reels. Explain why. NCERT Exemplar Problems Class 7 Science Chapter 3 Fibre to Fabric . The wool is obtained mainly from animals like sheep, yak and goat. 10.Silkworms secrete fibre made of … The long fibres are obtained by unwinding the threads from cocoons. This process is termed as shearing. → Silk fibres are then spun into silk threads, which are woven into silk cloth by weavers. 4. The under-fur of Kashmiri goat is soft. Sericulture, or silk farming, is the cultivation of silkworms to produce silk.Although there are several commercial species of silkworms, Bombyx mori (the caterpillar of the domestic silkmoth) is the most widely used and intensively studied silkworm. The process of taking out threads from the cocoon for use as silk is called reeling the silk. First read and understand the notes. 5. Keratin (/ ˈ k ɛr ə t ɪ n /) is one of a family of fibrous structural proteins known as scleroproteins. 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. mention any two. But the question arises, how silkworm produces silk? The process of taking out threads from the cocoon for use as silk is called reeling the silk. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 7.. 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. The process of cutting off the woollen fleece of sheep with a thin layer of skin is called shearing. Set the loom after the warp and weft are prepared. Sep 15,2020 - Can anyone explain the process of throwing silk? Step 5: Spinning. 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. (b) spinning of silk fibres. Answer: In the process of digestion, the various food materials break down to form new substances which can be absorbed by the body. The hair provides woollen fibres that are then processed to obtain woollen yarn. The silk industry makes a distinction between pure-dye silk and what is called weighted silk. Join now. A material which is composed of thin and continuous strands is known as fiber. This process is known as reeling the silk. Do you know about the ‘Plastic-eating’ fungus discovered in PakistanIn the pupa stage, the larval structures of the silkworm are broken down forming adult structures and the caterpillar gets transformed into a moth. Step 3: Extracting thread. This website uses cookie or similar technologies, to enhance your browsing experience and provide personalised recommendations. Do you know that silk is one of the world's first products to get the 'Made in China' tag? Log in. Step I: The first step is the removal of the fleece of the sheep along with a thin layer of skin. Silk fibres come from cocoons of the silk moth. Hatching of eggs: After 10 days of incubation, the eggs are hatched into larvae called the caterpillar. Silk is a natural protein fiber produced by the larvae of certain specific insects like caterpillars of moths. (c) weaving of silk cloth. Merchants and peasants were not allowed to wear silk. memonayesha1998 memonayesha1998 58 seconds ago Science Secondary School +5 pts. From the above article, it is clear that silk thread is nothing but a protein fiber and how is it produced from Silkworm. 1. Related Products The process of cutting off the woollen fleece of sheep with a thin layer of skin is called shearing. NCERT Solutions for Class 7 Science Chapter 3 Animal Fibres Wool And Silk are provided here with simple step-by-step explanations. UPSC IAS 2020 Exam: Click here to get the Complete 30 Days Study Plan to score high in Prelims. Silk fibres are used for weaving silk cloth. Silkis a fine, strong, soft and shining fibre produced by silkworms in making their cocoons. 10. Explain the reason. All these animals have an outer covering of hair, which is shaved off to obtain wool fibres. We have received your request successfully. Step 4: Dyeing. The natural colour of wool is generally creamy white though some breeds of sheep produce wool having brown and black colours. (iii) Converting silk fibres into silk cloth: Silk fibres obtained from cocoons are spun (twisted) to form silk threads called silk yarn. Its scientific name is Bombyx Mori. Find an answer to your question Explain the process of making silk class 7 1. Answer: The process of making yarn from fibres is called spinning. Why? 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. The process approach can be applied to any organization and any management system regardless of type, size or complexity. 9. The process of taking out threads from the cocoon for use as silk is called reeling the silk. Soon the caterpillar completely covers itself by silk fibres and turns into pupa. The process by which silk fiber is obtained is called REELING THE SILK. 2. Question: The process of digestion is a chemical change. The hair provides woollen fibres that are then processed to obtain woollen yarn. On the mountage, the ripe worms exude silk, spin the cocoon around itself and transformed into the pupa inside it. All questions and answers from the NCERT Book … What is Sericulture?Cultivation of Silkworm is known as sericulture. The mulberry silk moth or Bombyx Mori is used to produce silk by the commercial silk industry. … It describes the animals that yield wool and the process through which fibres are converted into wool. Log in. class 7 - 20016511 1. What are the common health problems found in the people who work in silk industry? 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. Class 7 Science Chapter 3 MCQ tests with answers and explanation are given below. Step3: The silk thread is then bleached and dyed into many shades. Answer: In the process of digestion, the various food materials break down to form new substances which can be absorbed by the body. Silk Manufacturing Process Silk is a natural protein fiber produced by certain caterpillars in orderto encase themselves in the form of cocoons. You also learnt that wool and silk fibres are obtained from animals. Then in approximately 30 to 40 days, growth takes place, larvae become long, sloppy and magnified.Now continuously for three days this insect spins his head around it and forms the solution of a single long thread which is known as Koya or cocoon or a cocoon is a protective case or shell that the silkworm spins around it. Once a sheep develops a thick coat of hair, it is shaved off to obtain wool. Give an example from the sources of animals fibres? It is done by the machines similar to those used by barbers to remove hairs. The biological scientific name of the silkworm is Bombyx Mori (In Latin mulberry Silkmoth). This brings the fibres together to form a yarn. Explanation: Breeding and management of silkworms for obtaining silk are called sericulture. mention any two. Figure 1: Animals that yield wool The process of taking out threads from the cocoon for use as silk is called reeling the silk. Hatching of eggs: After 10 days of incubation, the eggs are hatched into larvae called the caterpillar. 2.7 “We wear different types of clothes in different seasons”. (iii) Sericulture: The rearing of silkworms for obtaining silk is called sericulture. The rearing of silkworms for obtaining silk is called Sericulture. Fill in … 3. they are caterpillars of silk moth 4. it is the process of removing thin layer of body 5. The rearing of silkworms for obtaining silk is called (a) cocoon (b) silk (c) sericulture (d) silviculture. Ask your question. Some animals that live in cold places generally develop a thick coat of hair on their body. Silkworm is … Write the complete process to obtain the silk fibre from the cocoons? Clothes made from Silk and other things are liked by everyone because of its texture. Silk yarns come from the cocoon of the silkworm. It is mainly composed of fibroin. In this process, fibres from a mass of cotton wool are drawn out and twisted. (d) the process of taking silk threads from cocoon. 3. Silk is a type of natural fiber or animal fiber. Reeling is also done in special machines. The further development of the pupa into moth continues inside the cocoon (Fig. fiber. Scouring in tanks Examples of natural fibers are cotton and silk whereas examples of synthetic fibers are: nylon, polyester, etc. NCERT Book for Class 7 Science Chapter 3 Fibre to Fabric is available for reading or download on this page. Silk has been cultivated in China since ancient times and has been trading worldwide since then. Fibre to Fabric Class 7 Extra Questions Science Chapter 3 Fibre to Fabric Class 7 Science Extra Questions Very Short Answer Type Question 1. 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Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon. Class 7 Science Chapter 3 MCQ tests with answers and explanation are given below. Join now. 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 cocoons are kept under the sun or boiled or exposed to steam. Let us find out! Silk thread so obtained is woven into different types of cloths, i.e. The rearing of silkworms for obtaining silk is called (a) cocoon (b) silk (c) sericulture . Fill in the Blanks Question 1. 10. Silk fibre is made of a protein. This process is termed as shearing. Rearing: the silkworm farmers buy the eggs of the Silkmoth and raise them. Explain sericulture how much time does it approximately take from the day of lying eggs by the silk moth to obtaining silk from it, State the steps involved in the production of wool. In this way, Silk is prepared from Silkworm. The caterpillar hatches from a very small egg and is an eating machine. NCERT Solutions of Fibre to Fabric Class 7 To get an insight of this process, we will first study the life cycle of a silkworm. Ask your question . Silk was believed to have first been produced in China as early as the Neolithic Period. 9. Join now. Keeping Silk a Secret Silk became a prized export for the Chinese. Silk is an animal fibre, which is obtained from silkworms that live on mulberry trees. (iii) Sericulture: The rearing of silkworms for obtaining silk is called sericulture. So, to learn any chapter you have to follow these steps . (b) spinning of silk fibres. Silk … Shearing The process of removal of the fleece from an animal is called shearing. 2.5 The Process of Spinning; 2.6 Write one differences between ginning and retting process. There are 4 natural silk varieties, namely Mulberry silk, Tasar silk, Muga silk, and Eri silk. Question: The process of digestion is a chemical change. Answered Explain the process of making silk class 7 1 See answer memonayesha1998 is waiting for your help. World’s first stable semi-synthetic organism discovered. The silk fibres separate out. These coating helps the animals to trap air in it and keep them warm as air is a poor conductor of heat. Reel silk threads from several cocoons together on a wooden spindle into a uniform strand of raw silk.

explain the process of obtaining silk class 7

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