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Home / Barueri / explain the process of obtaining silk class 7

explain the process of obtaining silk class 7

After attempting 3 or 4 tests out of these 20 tests, you will feel confident about this chapter. The process of taking out threads from the cocoon for use as silk is called reeling the silk. Name some wool yielding animals. Spin silk thread by hand on wooden or plastic tubes to be prepared for warp or weft. Smuggling Silk Silk is then obtained from this net. It provides the complete revision for 7th Science Chapter 3. (iii) Converting silk fibres into silk cloth: Silk fibres obtained from cocoons are spun (twisted) to form silk threads called silk yarn. Nobles and kings of foreign lands desired silk and would pay high prices for the cloth. The Process of obtaining Silk from the Silkworms. Silk fibres are used for weaving silk cloth. 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.) Answer: In the process of digestion, the various food materials break down to form new substances which can be absorbed by the body. The process by which silk fiber is obtained is called REELING THE SILK. Answered Explain the process of making silk class 7 1 See answer memonayesha1998 is waiting for your help. The process approach can be applied to any organization and any management system regardless of type, size or complexity. 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 Mulberry Silk Moth is the most common kind of silk moth that produces soft elastic and shining silk. Silk … This brings the fibres together to form a yarn. The silk yarn is then woven on looms into silk cloth by the weavers. Step 5: Spinning. Anyone caught telling the secret or taking silkworms out of China was put to death. (iii) Converting silk fibres into silk cloth: Silk fibres obtained from cocoons are spun (twisted) to form silk threads called silk yarn. Access Answers of NCERT exemplar for Class 7 Science Chapter 3- Fibre to Fabric Multiple Choice Questions. 5. Step II: The sheared fleece is systematically washed in tanks in order to remove the grease, dust and dirt. Later, silk clothing was restricted to only the noble class. Log in. This is known as scouring. This section contains Class 6 Science Chapter 3 Extra Questions and important Keywords. Their diet of continually eating mulberry leaves results in a semi-liquid protein called fibroin. Hope you like them and do not forget to like , social share and comment at the end of the page. It describes the animals that yield wool and the process through which fibres are converted into wool. The process of taking out threads from the cocoon for use as silk is called _____ the silk. Set the loom after the warp and weft are prepared. It describes the life history of silk moth and the process of obtaining silk from the cocoon. What are the common health problems found in the people who work in silk industry? The hair provides woollen fibres that are then processed to obtain woollen yarn. What is a larva ? Silk fibres are converted into silk yarn which is used for making silk cloth. Answer: In the process of digestion, the various food materials break down to form new substances which can be absorbed by the body. memonayesha1998 memonayesha1998 58 seconds ago Science Secondary School +5 pts. 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. जारी रहेगा युवाओं और छात्रों का मार्गदर्शन, UPPSC ACF/RFO Mains Result 2018 Announced @uppsc.up.nic.in, 294 Selected for Interview Round, SSC JE Admit Card 2020 for Bihar CR Released @ssc-cr.org, Download Central Region Junior Engineer Call Letter Here, SSC Selection Post 8 Admit Card 2020 for CR Bihar Download @sscer.org: Check Accepted and Rejected Application, This website follows the DNPA’s code of conduct, CBSE Marking Scheme for Class 10 Elements of Business Sample Paper 2021. Silk was even used as money during some Ancient Chinese dynasties. (c) weaving of silk cloth. 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. Wool is acquired from the fleece or hair of these animals. Figure 6: Rearing of Silkworms. 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. 3. Step I: The first step is the removal of the fleece of the sheep along with a thin layer of skin. (c) weaving of silk cloth. The process of taking out threads from the cocoon for use as silk is called reeling the silk. This process is called reeling. Merchants and peasants were not allowed to wear silk. And then, weave silk by hand loom or power loom. What is Sericulture?Cultivation of Silkworm is known as sericulture. 3.9). From Sheep to Wool – Step by Step Process for Wool Production The different processes involved in wool production are shearing, scouring, grading, dyeing, and drying. Rearing Process of Silkworm: Step # 7. 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? α-Keratin is a type of keratin found in vertebrates. Answer: The sources of obtaining fibres are plants and animals. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon. Wool is obtained from the fleece (hair) of sheep or yak. Fill in … Ask your question . Answer: A pile of cocoons is used for obtaining silk fibres. Reeling of silk is (a) a process of making silk reels. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 7.. From the above article, it is clear that silk thread is nothing but a protein fiber and how is it produced from Silkworm. Silkis a fine, strong, soft and shining fibre produced by silkworms in making their cocoons. Sample papers, board papers and exam tips. The long fibres are obtained by unwinding the threads from cocoons. Then the topic of silk begins. Reeling is also done in special machines. It is done by the machines similar to those used by barbers to remove hairs. Step2: Reeling the silk, which is the process of delicately unwinding the fibre from the cocoon. The caterpillar hatches from a very small egg and is an eating machine. Explanation: Breeding and management of silkworms for obtaining silk are called sericulture. Reeling of silk is (a) a process of making silk reels. 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. 3. Q9: Explain the process of making yarn from fibre. From cocoon to silk → For obtaining silk, moths are reared and their cocoons are collected to get silk threads. A pile of cocoons is used for obtaining silk fibres. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon. A pile of cocoon is used for obtaining silk fibre. Explain the processing of silk. Every time starts a new test, when you click the button Start a New Test. 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. Silk is an animal fibre, which is obtained from silkworms that live on mulberry trees. Fill in … How is Silk obtained from silkworms? (d) the process of taking silk threads from cocoon. Every time starts a new test, when you click the button Start a New Test. 1. A material which is composed of thin and continuous strands is known as fiber. NCERT Solutions for Class 7 Science Chapter 3 Animal Fibres Wool And Silk are provided here with simple step-by-step explanations. → Reeling is done in special machines, which unwind the threads or fibres of silk from the cocoon. Step3: The silk thread is then bleached and dyed into many shades. 1. → Silk fibres obtained after reeling are spun into silk threads. Question: Write a caption for each of the figures given as figure (a-d). mention any two. 2.2 With the help of an activity, can you show the process of weaving? Silk fibre is made of a protein. Rearing of silks is called sericulture.Degummed fibers from B. mori are 5-10 μm in diameter. It provides the complete revision for 7th Science Chapter 3. In this way, Silk is prepared from Silkworm. (iii) Sericulture: The rearing of silkworms for obtaining silk is called sericulture. The cocoons are kept under the sun or boiled or exposed to steam. The cocoon helps the worm to stay protected from the harsh and unfriendly weather conditions. Why do we need to store silk … 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 world's first practice of silk production was started in China. We have received your request successfully. Explanation of all important topics are included in the form of questions here to provide an ample practice of Class 6 … Ask your question. (c) weaving of silk cloth. The process of cutting off the woollen fleece of sheep with a thin layer of skin is called shearing. Most of the Mulberry silk variety is produced in the country.- In 1943, the Central Silk Research Zone was established in Berhampore (Paschim Bengal).- Most of the mulberry silk (Bombyx Mori) is produced in India.- Silk thread is a protein fiber while cotton and jute yarn is cellulose. First read and understand the notes. Let us find out! | EduRev Class 7 Question is disucussed on EduRev Study Group by 174 Class 7 Students. Let's study about silkworm through this article, and how this worm makes silk. Process of Obtaining Silk from Silkworm - Chapter 3 - Fiber To Fabric - Science Class 7th NCERT The silk industry makes a distinction between pure-dye silk and what is called weighted silk. Spinning is done at home using simple devices like hand spindle (Takli) and charkha. Reel silk threads from several cocoons together on a wooden spindle into a uniform strand of raw silk. → Silk fibres are then spun into silk threads, which are woven into silk cloth by weavers. Ask your question. Answer: The process of making yarn from fibres is called spinning. class 7 - 20016511 1. The biological scientific name of the silkworm is Bombyx Mori (In Latin mulberry Silkmoth). Participate in learning and knowledge sharing. Do you know which part of the sheep’s body yields fibres? In this page we have Class 7 Science Chapter 3: Fibre to Fabric Worksheet . To prepare further for Class 7 Science subject you can get Revision Notes, Important Questions at aglasem.com for free. 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. Soon the caterpillar completely covers itself by silk fibres and turns into pupa. NCERT Exemplar for Class 7 Science Chapter 3 Fibre to fabric Multiple Choice Questions 1. All questions and answers from the NCERT Book … There are 4 natural silk varieties, namely Mulberry silk, Tasar silk, Muga silk, and Eri silk. The under-fur of Kashmiri goat is soft. To produce weighted silk, metallic substances are added to the fabric during the dying process. (b) spinning of silk fibres. Write the complete process to obtain the silk fibre from the cocoons? The rearing of silkworms for obtaining silk is called 6. The long fibres are obtained by unwinding the threads from cocoons. In this process, fibres from a mass of cotton wool are drawn out and twisted. 11. Question: The process of digestion is a chemical change. NCERT Solutions of Fibre to Fabric Class 7 Find an answer to your question Explain the process of making silk class 7 1. Class 7 Science Chapter 3 MCQ tests with answers and explanation are given below. In a span of 10 days, each and every egg produces a small female insect called larvae also known as Caterpillar. NCERT Exemplar Problems Class 7 Science Chapter 3 Fibre to Fabric . Also you can give online test and analyze your preparation level. 9. Process of Obtaining Silk from Silkworm - Chapter 3 - Fiber To Fabric - Science Class 7th NCERT Explain why. 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Differentiate between the eri silk and other types of silk. Rearing: the silkworm farmers buy the eggs of the Silkmoth and raise them. This stage is often referred to as the sleeping stage of the silkworm. All these animals have an outer covering of hair, which is shaved off to obtain wool fibres. This process is termed as shearing. In the pure-dye process, the silk is colored with dye, and may be finished with water-soluble substances such as starch, glue, sugar, or gelatin. The rearing of silkworms for obtaining silk is called (a) cocoon (b) silk (c) sericulture (d) silviculture. Silk is a natural protein fiber produced by the larvae of certain specific insects like caterpillars of moths. Dye silk thread in a dye bath. … Silk is a type of natural fiber or animal fiber. Soln: The answer is (c) sericulture. Sheep are usually shorn annually in the spring/summer months. Fill in the Blanks Question 1. The process of taking out threads from the cocoon for use as silk is called reeling the silk. The wool is obtained mainly from animals like sheep, yak and goat. Explain the reason. Log in. Silk Manufacturing Process Silk is a natural protein fiber produced by certain caterpillars in orderto encase themselves in the form of cocoons. Machine unwinds the silk thread from cocoons. Class 7 Study Material – Notes, Important Questions, Practice Tests. The pupa after metamorphosing into adult moth comes out by piercing open the cocoon. Silk thread so obtained is woven into different types of cloths, i.e. Why? To get an insight of this process, we will first study the life cycle of a silkworm. The emperors of China wanted to keep the process for making silk a secret. Shearing is done with a manual […] The silk fibres separate out. 2. Join now. Step 3: Extracting thread. Silk has set the standard inluxury fabrics for several millennia. The rearing of silkworms for obtaining silk is called (a) cocoon (b) silk (c) sericulture . The process of selecting parent sheep for obtaining special characteristics in their offspring (such as soft under-hair) is called ‘selective breeding‘. 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The process of taking out threads from the cocoon for use as silk is called reeling the silk. Now, these larvae are converted into a pupa. The process of cutting off the woollen fleece of sheep with a thin layer of skin is called shearing. Multiple Choice Questions (MCQs) Question 1: The rearing of silkworms for obtaining silk is called (a) cocoon (b) silk (c) sericulture . 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. (iii) Sericulture: The rearing of silkworms for obtaining silk is called sericulture. Step 6: Weaving. Keeping Silk a Secret Silk became a prized export for the Chinese. The rearing of silkworms for obtaining silk is called Sericulture. What is the process approach? Question: The process of digestion is a chemical change. And further, this silk is used in the manufacture of clothes, etc. Fig. n Class VI you have learnt about some fibres obtained from plants. Silk yarns come from the cocoon of the silkworm. Explain sericulture how much time does it approximately take from the day of lying eggs by the silk moth to obtaining silk from it; Define reeling of silk; State the steps involved in the production of wool ; Write a brief note about anthrax? Once a sheep develops a thick coat of hair, it is shaved off to obtain wool. Step4: The silk fibre is then spun into silk thread, which is then woven into silk cloth by weavers. Breeding and management of silkworms for obtaining silk is called as sericulture. 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. The cocoon are kept under the sun, boiled water or exposed to steam. Its scientific name is Bombyx Mori. The soft looking silk yarn is as strong as a comparable thread of steel. Our counselor will call to confirm your booking. Scouring in tanks Hatching of eggs: After 10 days of incubation, the eggs are hatched into larvae called the caterpillar. Solution: (d) The process of unwinding the silk filaments from the cocoon and combining them together to make a thread of raw silk … Keratin (/ ˈ k ɛr ə t ɪ n /) is one of a family of fibrous structural proteins known as scleroproteins. - 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). Animal fibres are naturally obtained from animals. This makes the silk thread of Koya broken into small pieces. It describes the life history of silk moth and the process of obtaining silk from the cocoon. Silk was believed to have first been produced in China as early as the Neolithic Period. Give an example from the sources of animals fibres? Join now. navneetkumar165 navneetkumar165 26.07.2020 Science Primary School +5 pts. Hatching of eggs: After 10 days of incubation, the eggs are hatched into larvae called the caterpillar. Silk is a natural fibre which is obtained from an insect (called silk moth). The mulberry silk moth or Bombyx Mori is used to produce silk by the commercial silk industry. In this way, Silk is prepared from Silkworm. Fibre to Fabric Class 7 Extra Questions Science Chapter 3 Fibre to Fabric Class 7 Science Extra Questions Very Short Answer Type Question 1. 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. 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. Rearing silkworms → A female silk moth lays hundreds of eggs at a time. Do you know that silk is one of the world's first products to get the 'Made in China' tag? Step 5: Spinning. Call our LearnNext Expert on 1800 419 1234 (tollfree) OR submit details below for a call back. It is done by the machines similar to those used by barbers to remove hairs. 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. So, the process of digestion is a chemical change. (d) the process of taking silk threads from cocoon. Silkworm is … The silk fibres separate out. Obtaining of silk from cocoon: First of all, cocoons are boiled and then silk fiber is separated out; using machines. 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. Log in. So, silk is an animal fibre. Related Products It is mainly composed of fibroin. Explain why. Name the sources of obtaining fibres. Class 7 Science Chapter 3 MCQ tests with answers and explanation are given below. Silk fibres come from cocoons of the silk moth. 3. they are caterpillars of silk moth 4. it is the process of removing thin layer of body 5. 10. 1.What changes take place in the Pupa stage of silkworm? fiber. 9. Pattanwadi breed of sheep’s are found in _____ Down 2. The natural colour of wool is generally creamy white though some breeds of sheep produce wool having brown and black colours. Silkworm is an insect that makes silk. UPSC IAS 2020 Exam: Click here to get the Complete 30 Days Study Plan to score high in Prelims. Obtaining of silk from cocoon: First of all, cocoons are boiled and then silk fiber is separated out; using machines. Nobles and kings of foreign lands desired silk and would pay high prices for the cloth. fiber. This process is termed as shearing. 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. The Cocoons are kept under the sun or boiled or exposed to steam. The further development of the pupa into moth continues inside the cocoon (Fig. This process is known as reeling the silk. 4. Give an example from the sources of animals fibres? Reeling of silk is (a) a process of making silk reels. Describe the life history of silkmoth briefly? Machine unwinds the silk thread from cocoons. Join now. 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.) What is a larva ? NCERT Solutions For Class 7 Science Chapter 3: This chapter explains the process of obtaining wool and silk. It describes the animals that yield wool and the process through which fibres are converted into wool. For obtaining silk, silk worm moths are reared and their cocoons are collected to get silk threads. The hair provides woollen fibres that are then processed to obtain woollen yarn. What are the common health problems found in the people who work in silk industry? … 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 … But the question arises, how silkworm produces silk? Silk is produced by this insect. Step 4: Dyeing. Differentiate between the eri silk and other types of silk. 2. NCERT Solutions For Class 7 Science Chapter 3: This chapter explains the process of obtaining wool and silk. 10. The origins of silk date back toAncient China. Step 4: Dyeing. During a stage of its life cycle, the silkworm weaves a net around itself. Soln: Answer is (d) the process of taking silk threads from cocoon. (d) silviculture Answer: (c) Sericulture is a practice of rearing silkworms for obtaining silk while silviculture is a practice of developing and caring forests. VERY SHORT ANSWER QUESTIONS. Spin silk thread by hand on wooden or plastic tubes to be prepared for warp or weft. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 7.. Log in. After attempting 3 or 4 tests out of these 20 tests, you will feel confident about this chapter. This covering is known as cocoon . Silk has been cultivated in China since ancient times and has been trading worldwide since then. (b) spinning of silk fibres. 3. Once a sheep develops a thick coat of hair, it is shaved off to obtain wool. 2.4 What do you know about the history of clothing materials? 11. By continuing to use our website, you agree to our, Do you know about the ‘Plastic-eating’ fungus discovered in Pakistan. Some animals that live in cold places generally develop a thick coat of hair on their body. Keeping Silk a Secret Silk became a prized export for the Chinese. 2.7 “We wear different types of clothes in different seasons”.

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