Every time starts a new test, when you click the button Start a New Test. Call our LearnNext Expert on 1800 419 1234 (tollfree) OR submit details below for a call back. How is Silk obtained from silkworms? And further, this silk is used in the manufacture of clothes, etc. Class 7 Science Chapter 3 MCQ tests with answers and explanation are given below. (b) spinning of silk fibres. The long fibres are obtained by unwinding the threads from cocoons. The Process of obtaining Silk from the Silkworms. Describe the life history of silkmoth briefly? These coating helps the animals to trap air in it and keep them warm as air is a poor conductor of heat. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 7.. Log in. Silk fibre is made of a protein. Question: The process of digestion is a chemical change. The silk industry makes a distinction between pure-dye silk and what is called weighted silk. Sheep are usually shorn annually in the spring/summer months. The process of cutting off the woollen fleece of sheep with a thin layer of skin is called shearing. Rearing silkworms → A female silk moth lays hundreds of eggs at a time. Keeping Silk a Secret Silk became a prized export for the Chinese. Reeling of silk is (a) a process of making silk reels. 2.5 The Process of Spinning; 2.6 Write one differences between ginning and retting process. 3. Ask your question. It is done by the machines similar to those used by barbers to remove hairs. Explain the reason. The process approach can be applied to any organization and any management system regardless of type, size or complexity. 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. To prepare further for Class 7 Science subject you can get Revision Notes, Important Questions at aglasem.com for free. 4. What is the process approach? … Process of Obtaining Silk from Silkworm - Chapter 3 - Fiber To Fabric - Science Class 7th NCERT Breeding and management of silkworms for obtaining silk is called as sericulture. The rearing of silkworms for obtaining silk is called (a) cocoon (b) silk (c) sericulture . Fill in the Blanks Question 1. Explain the processing of 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. This process is known as reeling the silk. The silk yarn is then woven on looms into silk cloth by the weavers. (iii) Sericulture: The rearing of silkworms for obtaining silk is called sericulture. There are 4 natural silk varieties, namely Mulberry silk, Tasar silk, Muga silk, and Eri silk. Step I: The first step is the removal of the fleece of the sheep along with a thin layer of skin. 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. Step 4: Dyeing. Silk was believed to have first been produced in China as early as the Neolithic Period. Write the complete process to obtain the silk fibre from the cocoons? The Cocoons are kept under the sun or boiled or exposed to steam. Ask your question. We have received your request successfully. Question: Write a caption for each of the figures given as figure (a-d). 1. The origins of silk date back toAncient China. Hope you like them and do not forget to like , social share and comment at the end of the page. 10.Silkworms secrete fibre made of 10. → Silk fibres obtained after reeling are spun into silk threads. Fill in … 1. The cocoon are kept under the sun, boiled water or exposed to steam. The process of taking out threads from the cocoon for use as silk is called reeling the silk. 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 (d) silviculture Soln: Answer is (c) sericulture Explanation: Breeding and management of silkworms for obtaining silk is … Anyone caught telling the secret or taking silkworms out of China was put to death. World’s first stable semi-synthetic organism discovered. This stage is often referred to as the sleeping stage of the silkworm. 9. Step 6: Weaving. In this way, Silk is prepared from Silkworm. 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. For obtaining silk, silk worm moths are reared and their cocoons are collected to get silk threads. Silk has set the standard inluxury fabrics for several millennia. Silk is an animal fibre, which is obtained from silkworms that live on mulberry trees. This brings the fibres together to form a yarn. 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Silk fibres come from cocoons of the silk moth. 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? Shearing The process of removal of the fleece from an animal is called shearing. Explain why. - 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). On the mountage, the ripe worms exude silk, spin the cocoon around itself and transformed into the pupa inside it. The process of selecting parent sheep for obtaining special characteristics in their offspring (such as soft under-hair) is called ‘selective breeding‘. Mounting: Mounting is the process of transferring the ripe worms to the mountages. It is done by the machines similar to those used by barbers to remove hairs. The process of taking out threads from the cocoon for use as silk is called reeling the silk. fiber. Obtaining of silk from cocoon: First of all, cocoons are boiled and then silk fiber is separated out; using machines. Silk fibres are used for weaving silk cloth. NCERT Book for Class 7 Science Chapter 3 Fibre to Fabric is available for reading or download on this page. (d) the process of taking silk threads from cocoon. To produce weighted silk, metallic substances are added to the fabric during the dying process. It describes the life history of silk moth and the process of obtaining silk from the cocoon. The silk fibres separate out. Multiple Choice Questions (MCQs) Question 1: The rearing of silkworms for obtaining silk is called (a) cocoon (b) silk (c) sericulture . Fill in … 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 natural colour of wool is generally creamy white though some breeds of sheep produce wool having brown and black colours. Do you know that silk is one of the world's first products to get the 'Made in China' tag? Rearing Process of Silkworm: Step # 7. Explain why. All questions and answers from the NCERT Book … Give an example from the sources of animals fibres? You also learnt that wool and silk fibres are obtained from animals. Class 7 Study Material – Notes, Important Questions, Practice Tests. A pile of cocoon is used for obtaining silk fibre. Silk yarns come from the cocoon of the silkworm. Silkis a fine, strong, soft and shining fibre produced by silkworms in making their cocoons. From the above article, it is clear that silk thread is nothing but a protein fiber and how is it produced from Silkworm. Silk is then obtained from this net. NCERT Exemplar for Class 7 Science Chapter 3 Fibre to fabric Multiple Choice Questions 1. 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. Find an answer to your question Explain the process of making silk class 7 1. It describes the life history of silk moth and the process of obtaining silk from the cocoon. NCERT Exemplar Class 7 Science is very important resource for students preparing for VII Board Examination. Silk … Join now. Sep 15,2020 - Can anyone explain the process of throwing silk? This website uses cookie or similar technologies, to enhance your browsing experience and provide personalised recommendations. 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. VERY SHORT ANSWER QUESTIONS. Why do we need to store silk … This process is termed as shearing. → Silk fibres are then spun into silk threads, which are woven into silk cloth by weavers. 2.2 With the help of an activity, can you show the process of weaving? NCERT Exemplar Class 7 Science is very important resource for students preparing for VII Board Examination. Nobles and kings of foreign lands desired silk and would pay high prices for the cloth. The cocoons are kept under the sun or boiled or exposed to steam. The silk fibres separate out. Shearing is done with a manual […] Set the loom after the warp and weft are prepared. Hatching of eggs: After 10 days of incubation, the eggs are hatched into larvae called the caterpillar. 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