Step I: The first step is the removal of the fleece of the sheep along with a thin layer of skin. 4. Nobles and kings of foreign lands desired silk and would pay high prices for the cloth. Silk Manufacturing Process Silk is a natural protein fiber produced by certain caterpillars in orderto encase themselves in the form of cocoons. NCERT Exemplar Problems Class 7 Science Chapter 3 Fibre to Fabric . 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. Nobles and kings of foreign lands desired silk and would pay high prices for the cloth. World’s first stable semi-synthetic organism discovered. Later, silk clothing was restricted to only the noble class. Step4: The silk fibre is then spun into silk thread, which is then woven into silk cloth by weavers. Step 6: Weaving. Class 7 Science Chapter 3 MCQ tests with answers and explanation are given below. 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. Log in. The process by which silk fiber is obtained is called REELING THE SILK. During a stage of its life cycle, the silkworm weaves a net around itself. The rearing of silkworms for obtaining silk is called (a) cocoon (b) silk (c) sericulture . NCERT Solutions of Fibre to Fabric Class 7 11. Answer: In the process of digestion, the various food materials break down to form new substances which can be absorbed by the body. Explanation of all important topics are included in the form of questions here to provide an ample practice of Class 6 … The long fibres are obtained by unwinding the threads from cocoons. Answer: A pile of cocoons is used for obtaining silk fibres. The origins of silk date back toAncient China. 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. Ask your question. 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 of taking out threads from the cocoon for use as silk is called reeling the silk. The Cocoons are kept under the sun or boiled or exposed to steam. Soon the caterpillar completely covers itself by silk fibres and turns into pupa. 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. Hatching of eggs: After 10 days of incubation, the eggs are hatched into larvae called the caterpillar. The process of taking out threads from the cocoon for use as silk is called _____ the silk. Step 5: Spinning. What is the process of making the fibre Jute? Cocoon is treated with hot air, steam, or boiling water. Animal fibres are naturally obtained from animals. - 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). NCERT Solutions For Class 7 Science Chapter 3: This chapter explains the process of obtaining wool and silk. The rearing of silkworms for obtaining silk is called 6. After attempting 3 or 4 tests out of these 20 tests, you will feel confident about this chapter. The silk industry makes a distinction between pure-dye silk and what is called weighted silk. Some animals that live in cold places generally develop a thick coat of hair on their body. Question 2. On the mountage, the ripe worms exude silk, spin the cocoon around itself and transformed into the pupa inside it. What are the common health problems found in the people who work in silk industry? The silk fibres separate out. n Class VI you have learnt about some fibres obtained from plants. Rearing of silks is called sericulture.Degummed fibers from B. mori are 5-10 μm in diameter. (d) the process of taking silk threads from cocoon. From the above article, it is clear that silk thread is nothing but a protein fiber and how is it produced from Silkworm. memonayesha1998 memonayesha1998 58 seconds ago Science Secondary School +5 pts. What is a larva ? Fig. 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.) This is known as scouring. mention any two. Why? To get an insight of this process, we will first study the life cycle of a silkworm. What is the process approach? But the question arises, how silkworm produces silk? Answer: Wool yielding animals are sheep, yak, llama, […] What is Sericulture?Cultivation of Silkworm is known as sericulture. It describes the animals that yield wool and the process through which fibres are converted into wool. Silkworm is … Spinning is done at home using simple devices like hand spindle (Takli) and charkha. Silk is a type of natural fiber or animal fiber. Join now. Anyone caught telling the secret or taking silkworms out of China was put to death. Fill in … Merchants and peasants were not allowed to wear silk. (iii) Converting silk fibres into silk cloth: Silk fibres obtained from cocoons are spun (twisted) to form silk threads called silk yarn. 1. Hope you like them and do not forget to like , social share and comment at the end of the page. Name the sources of obtaining fibres. → Reeling is done in special machines, which unwind the threads or fibres of silk from the cocoon. NCERT Solutions For Class 7 Science Chapter 3: This chapter explains the process of obtaining wool and silk. The world's first practice of silk production was started in China. 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. How is Silk obtained from silkworms? 2.3 What is ginning process? Silk is a natural fibre which is obtained from an insect (called silk moth). The process of cutting off the woollen fleece of sheep with a thin layer of skin is called shearing. The process of taking out threads from the cocoon for use as silk is called reeling the silk. Spin silk thread by hand on wooden or plastic tubes to be prepared for warp or weft. Related Products Join now. From cocoon to silk → For obtaining silk, moths are reared and their cocoons are collected to get silk threads. This process is called reeling. So, the process of digestion is a chemical change. VERY SHORT ANSWER QUESTIONS. The further development of the pupa into moth continues inside the cocoon (Fig. Every time starts a new test, when you click the button Start a New Test. Step II: The sheared fleece is systematically washed in tanks in order to remove the grease, dust and dirt. 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? The pupa after metamorphosing into adult moth comes out by piercing open the cocoon. mention any two. 10. 2.7 “We wear different types of clothes in different seasons”. Solution: (d) The process of unwinding the silk filaments from the cocoon and combining them together to make a thread of raw silk … The hair provides woollen fibres that are then processed to obtain woollen yarn. And then, weave silk by hand loom or power loom. Answered Explain the process of making silk class 7 1 See answer memonayesha1998 is waiting for your help. Fill in … The under-fur of Kashmiri goat is soft. Rearing silkworms → A female silk moth lays hundreds of eggs at a time. The mulberry silk moth or Bombyx Mori is used to produce silk by the commercial silk industry. Keratin (/ ˈ k ɛr ə t ɪ n /) is one of a family of fibrous structural proteins known as scleroproteins. Silk fibres are used for weaving silk cloth. 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. NCERT Solutions for Class 7 Science Chapter 3 Animal Fibres Wool And Silk are provided here with simple step-by-step explanations. (c) weaving of silk cloth. Answer: (a) Eggs of silk moth … Reeling of silk is (a) a process of making silk reels. Reeling is also done in special machines. Log in. Silk is then obtained from this net. Silk has been cultivated in China since ancient times and has been trading worldwide since then. It is mainly composed of fibroin. 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. 1. The silk fibres separate out. By continuing to use our website, you agree to our, Do you know about the ‘Plastic-eating’ fungus discovered in Pakistan. Then the topic of silk begins. Class 6 Science Chapter 3 Important Questions of Fibre to Fabric with intext questions. … Ask your question . Describe the life history of silkmoth briefly? The soft looking silk yarn is as strong as a comparable thread of steel. Figure 1: Animals that yield wool 9. Process of Obtaining Silk from Silkworm - Chapter 3 - Fiber To Fabric - Science Class 7th NCERT | EduRev Class 7 Question is disucussed on EduRev Study Group by 174 Class 7 Students. Question: The process of digestion is a chemical change. In this process, fibres from a mass of cotton wool are drawn out and twisted. What is a larva ? 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. Reeling of silk is (a) a process of making silk reels. Do you know which part of the sheep’s body yields fibres? A pile of cocoons is used for obtaining silk fibres. → Silk fibres obtained after reeling are spun into silk threads. Step 3: Extracting thread. 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.) 1. 9. Silkworm is an insect that makes silk. A pile of cocoon is used for obtaining silk fibre. Pattanwadi breed of sheep’s are found in _____ Down 2. Silk is an animal fibre, which is obtained from silkworms that live on mulberry trees. Silk fibres come from cocoons of the silk moth. Give an example from the sources of animals fibres? 5. All these animals have an outer covering of hair, which is shaved off to obtain wool fibres. Let's study about silkworm through this article, and how this worm makes silk. → Silk fibres are then spun into silk threads, which are woven into silk cloth by weavers. 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 believed to have first been produced in China as early as the Neolithic Period. The rearing of silkworms to obtain silk is known as sericulture. Wool is acquired from the fleece or hair of these animals. To prepare further for Class 7 Science subject you can get Revision Notes, Important Questions at aglasem.com for free. Step 5: Spinning. Silk fibres are converted into silk yarn which is used for making silk cloth. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon. 9. 3. Add your answer and earn points. It is done by the machines similar to those used by barbers to remove hairs. After attempting 3 or 4 tests out of these 20 tests, you will feel confident about this chapter. It describes the life history of silk moth and the process of obtaining silk from the cocoon. For obtaining silk, silk worm moths are reared and their cocoons are collected to get silk threads. Set the loom after the warp and weft are prepared. VERY SHORT ANSWER QUESTIONS. 2.4 What do you know about the history of clothing materials? Figure 6: Rearing of Silkworms. The process of taking out threads from the cocoon for use as silk is called reeling the silk. Write the complete process to obtain the silk fibre from the cocoons? Call our LearnNext Expert on 1800 419 1234 (tollfree) OR submit details below for a call back. Explain the processing of silk. (d) silviculture Answer: (c) Sericulture is a practice of rearing silkworms for obtaining silk while silviculture is a practice of developing and caring forests. This process is termed as shearing. 3. they are caterpillars of silk moth 4. it is the process of removing thin layer of body 5. NCERT Exemplar Class 7 Science is very important resource for students preparing for VII Board Examination. air and becomes silk fibre. In this page we have Class 7 Science Chapter 3: Fibre to Fabric Worksheet . Log in. NCERT Exemplar Class 7 Science is very important resource for students preparing for VII Board Examination. Available for CBSE, ICSE and State Board syllabus. It provides the complete revision for 7th Science Chapter 3. The process of taking out threads from the cocoon for use as silk is called reeling the silk. Its scientific name is Bombyx Mori. Explain the reason. The silk yarn is then woven on looms into silk cloth by the weavers. 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. Ask your question. A material which is composed of thin and continuous strands is known as fiber. 3. Question: Write a caption for each of the figures given as figure (a-d). First read and understand the notes. Answer: The process of making yarn from fibres is called spinning. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 7.. class 7 - 20016511 1. We have received your request successfully. 3.9). 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. Log in. Silk thread so obtained is woven into different types of cloths, i.e. So, silk is an animal fibre. Sheep are usually shorn annually in the spring/summer months. It provides the complete revision for 7th Science Chapter 3. Silk fibre is made of a protein. Silk is produced by this insect. (c) weaving of silk cloth. Class 7 Science Chapter 3 MCQ tests with answers and explanation are given below. Soln: Answer is (d) the process of taking silk threads from cocoon. Keeping Silk a Secret Silk became a prized export for the Chinese. Question: The process of digestion is a chemical change. Keeping Silk a Secret Silk became a prized export for the Chinese. Their diet of continually eating mulberry leaves results in a semi-liquid protein called fibroin. α-Keratin is a type of keratin found in vertebrates. 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. Sample papers, board papers and exam tips. The wool is obtained mainly from animals like sheep, yak and goat. Differentiate between the eri silk and other types of silk. The cocoon helps the worm to stay protected from the harsh and unfriendly weather conditions. Wool is obtained from the fleece (hair) of sheep or yak. In this way, Silk is prepared from Silkworm. 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? Class 7 Chemistry Fibre to Fabric: Processing fibres into wool: Processing fibres into wool . 4. fiber. Once a sheep develops a thick coat of hair, it is shaved off to obtain wool. 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 process of selecting parent sheep for obtaining special characteristics in their offspring (such as soft under-hair) is called ‘selective breeding‘. Once a sheep develops a thick coat of hair, it is shaved off to obtain wool. The process of cutting off the woollen fleece of sheep with a thin layer of skin is called shearing. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 7.. To produce weighted silk, metallic substances are added to the fabric during the dying process. NCERT Solutions for Class 7 Science Chapter 3 Animal Fibres Wool And Silk are provided here with simple step-by-step explanations. Silk has set the standard inluxury fabrics for several millennia. Step 4: Dyeing. 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. Reel silk threads from several cocoons together on a wooden spindle into a uniform strand of raw silk. Every time starts a new test, when you click the button Start a New Test. (d) the process of taking silk threads from cocoon. Join now. This section contains Class 6 Science Chapter 3 Extra Questions and important Keywords. 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. NCERT Book for Class 7 Science Chapter 3 Fibre to Fabric is available for reading or download on this page. 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. This stage is often referred to as the sleeping stage of the silkworm. 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 … The long fibres are obtained by unwinding the threads from cocoons. UPSC IAS 2020 Exam: Click here to get the Complete 30 Days Study Plan to score high in Prelims. The silk yarn is then woven on looms into silk cloth by the weavers. UP Board Exam 2021: Amid COVID-19 Pandemic The Board Might Set A New Record! This website uses cookie or similar technologies, to enhance your browsing experience and provide personalised recommendations. Multiple Choice Questions (MCQs) Question 1: The rearing of silkworms for obtaining silk is called (a) cocoon (b) silk (c) sericulture . It is done by the machines similar to those used by barbers to remove hairs. It describes the animals that yield wool and the process through which fibres are converted into wool. 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. Name some wool yielding animals. The cocoon are kept under the sun, boiled water or exposed to steam. Rearing Process of Silkworm: Step # 7. Answered Write the complete process to obtain the silk fibre from the cocoons? 2.2 With the help of an activity, can you show the process of weaving? The process approach can be applied to any organization and any management system regardless of type, size or complexity. And further, this silk is used in the manufacture of clothes, etc. Soln: The answer is (c) sericulture. Differentiate between the eri silk and other types of silk. Also you can give online test and analyze your preparation level. Participate in learning and knowledge sharing. 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. A fiber can be of two types: natural fiber and synthetic fiber. 2.5 The Process of Spinning; 2.6 Write one differences between ginning and retting process. 11. This process is termed as shearing. Step 4: Dyeing. In a span of 10 days, each and every egg produces a small female insect called larvae also known as Caterpillar. There are 4 natural silk varieties, namely Mulberry silk, Tasar silk, Muga silk, and Eri silk. Dye silk thread in a dye bath. This makes the silk thread of Koya broken into small pieces. Obtaining of silk from cocoon: First of all, cocoons are boiled and then silk fiber is separated out; using machines. Join now. The Mulberry Silk Moth is the most common kind of silk moth that produces soft elastic and shining silk. Q9: Explain the process of making yarn from fibre. Fill in the Blanks Question 1. Mounting: Mounting is the process of transferring the ripe worms to the mountages. 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. Silk thread so obtained is woven into different types of cloths, i.e. Dye silk thread in a dye bath. So, the process of digestion is a chemical change. (b) spinning of silk fibres. Hatching of eggs: After 10 days of incubation, the eggs are hatched into larvae called the caterpillar. 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. navneetkumar165 navneetkumar165 26.07.2020 Science Primary School +5 pts. 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The emperors of China wanted to keep the process for making silk a secret. (iii) Sericulture: The rearing of silkworms for obtaining silk is called sericulture. 10.Silkworms secrete fibre made of Explain why. 1.What changes take place in the Pupa stage of silkworm? (iii) Converting silk fibres into silk cloth: Silk fibres obtained from cocoons are spun (twisted) to form silk threads called silk yarn. Step3: The silk thread is then bleached and dyed into many shades. Answer: The sources of obtaining fibres are plants and animals. Shearing is done with a manual […] 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. (c) weaving of silk cloth. Explain why. Silk is a natural protein fiber produced by the larvae of certain specific insects like caterpillars of moths. Why do we need to store silk … Then the topic of silk begins. (b) spinning of silk fibres. Give an example from the sources of animals fibres? This process is called reeling. Silk was even used as money during some Ancient Chinese dynasties. Machine unwinds the silk thread from cocoons. Find an answer to your question Explain the process of making silk class 7 1. 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. Our counselor will call to confirm your booking. Process of Obtaining Silk from Silkworm - Chapter 3 - Fiber To Fabric - Science Class 7th NCERT 2. 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. Rearing: the silkworm farmers buy the eggs of the Silkmoth and raise them. Breeding and management of silkworms for obtaining silk is called as sericulture. Obtaining of silk from cocoon: First of all, cocoons are boiled and then silk fiber is separated out; using machines. Access Answers of NCERT exemplar for Class 7 Science Chapter 3- Fibre to Fabric Multiple Choice Questions. Smuggling Silk These coating helps the animals to trap air in it and keep them warm as air is a poor conductor of heat. You also learnt that wool and silk fibres are obtained from animals. Do you know that silk is one of the world's first products to get the 'Made in China' tag? … Ask your question. The process by which silk fiber is obtained is called REELING THE SILK. Examples of natural fibers are cotton and silk whereas examples of synthetic fibers are: nylon, polyester, etc. Reeling of silk is (a) a process of making silk reels. (iii) Sericulture: The rearing of silkworms for obtaining silk is called sericulture. It describes the life history of silk moth and the process of obtaining silk from the cocoon. Machine unwinds the silk thread from cocoons. Silkis a fine, strong, soft and shining fibre produced by silkworms in making their cocoons. The rearing of silkworms for obtaining silk is called Sericulture. Explanation: Breeding and management of silkworms for obtaining silk are called sericulture. 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 cocoons are kept under the sun or boiled or exposed to steam.
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