Answer: The pupa inside the cocoon dies. The long woolen fibres are spun (or twisted) into thick yarn called wool which is used for knitting sweaters, etc. Some important Facts about Fibre to Fabric worksheet for class 7 Paheli wanted to buy a silk frock and went to the market with her mother. We hope the NCERT Solutions for Class 7 Science Chapter 3 Fibre to Fabric help you. Answer: The sources of obtaining fibres are plants and animals. ↓ Answer: Wool is obtained from the fleece or hair of sheep. NCERT Books chapter-wise Solutions (Text & Videos) are accurate, easy-to-understand and most helpful in Homework & Exam Preparations. Wool is obtained from the fleece fleece (hair) of sheep or yak. She took out a thread from the edge of the two sarees shown by the shopkeeper and burnt As a result, natural silk is costly. With the help of the link provided below. Now-a-days scouring is done by machines. Answer: Life History of Silk Moth Formation of Silkworm. Answer: In Tibet and Ladakh, angora goats are found. To gain comprehensive knowledge on chapter Fibre to fabric we provide you With NCERT solutions for class 7 science chapter Fibre to fabric. 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. CBSE Class 6 Science Fibre to Fabric Worksheets with Answers for Chapter 3 in PDF format to download prepared by expert Science teachers from the latest edition of CBSE(NCERT) books. The subjects that the students take in their class 12 is also the basis for their career choice they take up. Students are advised to practice the NCERT MCQ Questions for Class 6 Science Chapter 3 Fibre to Fabric with Answers Pdf free download is available here. In order to produce silk, the silkworm developing inside the cocoon (as pupa) is not allowed to mature into an adult silk moth. Register Online for NCERT Class 6 Science tuition on Vedantu.com to score more marks in CBSE board examination. Artificial (synthetic) silk called rayon is obtained from wood pulp and it is made of modified plant material cellulose. If you have any query regarding NCERT Solutions for Class 7 Science Chapter 3 Fibre to Fabric, drop a comment below and we will get back Answer: Wool industry is an important source of livelihood for many people in our country. Answer: The process of breeding of selective parents for obtaining special characters in their offspring such as soft under hair in sheep, is termed as selective breeding. The most common silk moth is the mulberry silk moth. Answer: Answer: Different types of silk are mulberry silk, tassar silk, mooga silk and kosa silk. After the final moulting begins, the last feeding period (of about ten days) after which the worm grows to its full size. We have Provided Fibre to Fabric Class 7 Science MCQs Questions with Answers to help students understand the concept very well. Leave a comment Silk fibres NCERT Class 6 Science Food Fibre to Fabric. This document is highly rated by Class 7 students and has been Answer: Llama and alpaca are found in South America. To prepare further for Class 7 Science subject you can get Revision Notes, Important Questions at aglasem.com for free. The thread which burns giving a smell of burning paper will be cotton fibres. They are then spun and woven into fabric. The cocoons are collected and boiled in water to kill the insect inside them. Thus, tassar silk, mooga silk, kosa silk, etc are obtained from cocoons spun by different types of moths. Here you can read Chapter 3 of Class 7 Science NCERT Book. After reading the chapter, you can refer to our Class 7 NCERT Solutions. There are following two types of fibres that form the hair to sheep. The process of taking out fibres from the cocoon for use as silk is known as reeling the silk. To get silk thread, we have to dip cocoon in hot water to get silk thread which is wrapped over the cocoon. The process of separating the fleece of a sheep into sections according to the quality of woolen fibres (such as fine, coarse, long, short, etc) is called sorting. Soon the silkworm (or caterpillar) covers itself by silk fibres and turns into pupa. The wool is obtained mainly from animals like sheep, yak and goat. Answer: In first saree, one thread which burnt with a smell of burning hair is from pure silk, silk and hair are protein fibres. Answer: The maximum length of continuous silk thread that can be obtained from a cocoon is more than that of 1000 feet (1000 to 1500 feet) continuous in length. (cotton and jute are plant fibres). The people who do the job of sorting, sometimes, get infected by the bacteria called anthrax which cause a deadly blood disease called sorter’s disease. 24 SCIENCE 3 Fibre to Fabric I n Class VI you have learnt about some fibres obtained from plants. The scoured fleece is then dried. Scouring makes the fleece of sheep clean. Students are advised to practice the NCERT MCQ Questions for Class 7 Science Chapter 3 Fibre to Fabric with Answers Pdf free download is available here. The same quality wool obtained are then mixed together. This is how silk was discovered by chance. The silkworm continues to develop in the form of pupa inside the cocoon to form the silk moth. Recent Posts Sanskrit Class 10 â Chapter 5- à¤à¤¨à¤¨ त ल यवत सल Answer: Artificial silk is a plant fibre. Every section of wool obtained after sorting contains the same quality wool. (e) Female silk moths lay eggs. Science Class 7 || Menu Important Sample Paper Class 7th Science NCERT Solutions MCQs Notes of Class 7th Science Science Book Class 7 Close Nutrition in Plants Nutrition in Animals Fibre to Fabric Heat Acids, Bases and A fibre is a hair-like strand of material. Here students can get class & chapter wise Class 7 NCERT notes, which is very helpful to understand the subject and its chapter in a good manner. are prepared as per the Latest Exam Pattern. The empress found white worms eating up mulberry leaves. (a) Eggs are warmed to a suitable temperature for the larvae to hatch from eggs. We find that a fabric 3.3 Pulling a thread from a fabric Fig.3.4 Splitting the yarn into thin strands Fig. Silk Answer: A pile of cocoon is used for obtaining silk fibre. Copies of these textbooks may be downloaded and used as textbooks or for reference. Digital NCERT Books Class 7 Science pdf are always handy to use when you do not have access to physical copy. Silk fibres are spun into silk threads which are woven into silk cloth by weavers. The farmers keep eggs under hygienic condition. The resulting fibre is known as raw silk. CBSE Class 6 Science Notes Chapter 3 Fibre to Fabric Fibres: All cloth materials are made up of long, narrow, thin structures called fibres. In second saree, second thread which burnt with the smell of burning cotton and paper because cotton and paper both are carbohydrates and on burning they give similar smell. Answer: The process of taking out threads from the cocoons for use as silk is called reeling the silk. Silk is a natural fibre which is obtained from an insect (called silk moth). (After this, the fibres are scoured again and dried. NCERT Solutions for Class 7 Science Chapter 3 Fibre to Fabric Topics and Sub Topics in Class 7 Science Chapter 3 Fibre to Fabric: Section Name Topic Name 3 Fibre to Fabric 3.1 Wool 3.2 Silk Q.1. Paper is made of cellulose obtained from wood pulp. Mulberry silk is soft, lustrous (shiny) and elastic and can be dyed in beautiful colors. You can buy Class 7 Science NCERT Book from various online platforms and get doorstep delivery in no time. admin This covering is known as cocoon. To get fastest exam alerts and government job alerts in India, join our Telegram channel. Accidentally, a cocoon dropped into her cup of tea and a tangle of delicate threads separated from the cocoon. ↓ A female silk moth lays hundred of eggs at a time. Shearing does not hurt the sheep because the uppermost layer of the skin of sheep is ‘dead’. 3.5 Yar n split up into thin strands yarns are visible, you can gently pull one out with a pin or a needle. Finally, we conclude that the sheep’s hair is sheared off from the body, scoured, sorted, dyed, combed and spun to obtain wool (for knitting sweaters) and woolen yarn (for weaving cloth). The wool obtained after this is ready to be drawn into fibres). (c) After 25 to 30 days, the caterpillars stop eating and start spinning cocoons. (i) Picking out the burrs Answer: The most common silk moth is the mulberry silk moth. The cocoon are kept under the sun, boiled water or exposed to steam. Hope you like them and do not forget to like , social share and comment at the end of the page. Fibre to Fabric Class 7 Science Extra Questions Long Answer Type Question 1. The short woolen fibres are spun into fine yarn and then woven on a loom to make woolen clothes (like shawls, etc). (f) Cocoons are kept under the sun or boiled in water. You also learnt that wool and silk fibres are obtained from animals. (a) Eggs are warmed to a suitable temperature for the larvae to hatch from eggs. Tags CBSE Class 7 NCERT Solutions CBSE Class 7 Science Solutions Free Class 7 Science Solutions Free NCERT Online Solutions NCERT Books Online Solutions NCERT CBSE Class 7 Science Solutions NCERT CBSE Solutions NCERT Class 7 Science Chapter NCERT Class 7 Science Solutions NCERT Solution for Class 7 Science Chapter NCERT Solutions NCERT Solutions for Class 7 Science Solutions, Three Questions: NCERT 7th CBSE Honeycomb English Chapter 01 Question: Why did the king send two messengers …, Your email address will not be published. The hair of the sheep are shaved off by using a saving machine similar to that used by barbers. The wool which is used for knitting sweaters or for weaving shawls is the finished product of a long process. In this way, the first silk industry began in China. Answer: Natural silk is obtained from the cocoons of silkworms and it is made up of a protein. are prepared as per the Latest Exam Pattern. The thread which burns giving a smell a burning paper will be an artificial silk. Silkis a fine, strong, soft and shining fibre produced by silkworms in making their cocoons. Fabric needs more energy to tear apart as compared to a single fibre. The silk obtained from the cocoons of mulberry silk moth is called mulberry silk. The small fluffy fibres, called burrs, are picked out from the hair (burrs are soft, fluffy fibres in wool). Just click on the link, a new window will open containing all the NCERT Book Class 7 Science pdf files chapter-wise. Their food also contain a mixture of pulses, corn, jowar, oil cakes (material left after taking out oil from seeds) and minerals. Answer: According to an old Chinese legend, the empress Si-lung-Chi was asked by the emperor Huang-ti to find the cause of the damaged leaves of mulberry trees growing in their garden. v) The fibres are then dyed in different colours. Cotton and paper both are carbohydrates. This process is called shearing. Neha’s mother is intelligent and knowledgeable. Mulberry silk is soft, lustrous (shiny) and elastic and can be dyed in different colors. Just like silk, wool is also made up of proteins. The fleece of sheep (or cut hair of sheep) contains dust, dirt, dried sweat and grease, etc. The silkworms feed on the leaves of mulberry tree and grow bigger in size. Artificial silk is obtained from wood pulp and it is made of modified plant material ‘cellulose’. It is obtained from the cocoons of mulberry silkworm and is made up of protein. Yes, pure silk saree is more costly than an artificial one. The eggs are hatched into very small larvae within a week. Also after the chapter you can get links to Class 7 Science Notes, NCERT Solutions, Important Question, Practice Papers etc. This Solution has detailed answers to help you study thoroughly. Here we have given NCERT Class 6 Science Notes Chapter 3 Fibre to Fabric. (iv) Scouring ↓ Fibre to fabric class 7 fin al 1. New NCERT Solutions for Class 7 – Maths, Science, English, Hindi, Social Science, NCERT Solutions for Class 7 English (Honeycomb, Alien Hand), NCERT Solutions for Class 7 Hindi – Vasant, Durva, Mahabharat, NCERT Solutions for Class 7 Maths – Latest Solutions, NCERT Solutions for Class 7 Science – Latest Solutions, NCERT Solutions for Class 7 Social Science – History, Civics, Geography, NCERT Book Class 7 Science Chapter 4 Heat. Fibre (marked 3) is wool and fibre (marked 4) which is used for weaving saris is silk. People working in the wool industry sometimes get infected by a bacterium called anthrax, during the sorting (separating) the fleece of sheep into fibres of different qualities. Scroll down for Fibre to Fabrics from NCERT Book Class 7 Science Book & important study material. (g) Fibres are taken out from the cocoon. Dec 12, 2020 - Chapter 3 - Fibre to Fabric - PowerPoint Presentation, Science, Class 7 Class 7 Notes | EduRev is made by best teachers of Class 7. vi) The fibres are then straightened, combed and rolled into yarn. There they found that the artificial (synthetic) silk was much cheaper and wanted to know why. Download NCERT Chapters and Books in pdf format.Easy to print and read. So, on burning cotton and paper both give similar smell. Answer: Fibre (marked 1) which is used in filling quilts is cotton and fibre (marked 2) is jute. Wool is acquired from the fleece or hair of these animals. MCQ Questions for Class 7 Science with Answers are prepared as per the Latest Exam Pattern. For obtaining silk, silk moths are reared and their cocoons are collected to get silk thread. (iii) Shearing Wool is obtained from the fleece (hair) of sheep or yak. NCERT Solutions for Class 7 Science Chapter 3: Fibre to Fabric In this page we have Class 7 Science Chapter 3: Fibre to Fabric Worksheet . To obtain silk for commercial purposes, a large number of cocoons (containing living pupa) are killed. All pdf sheet consists of different type of questions asked in school exam like one mark , two marks , five marks and each question are ⦠How her mother distinguished between pure silk saree and an artificial silk saree? (e) Female silk moths lay eggs. If we perform the burning test, then natural silk fibre burns giving a smell of burning hair while artificial fibre burns giving a smell of burning paper. Answer: Sheep are herbivores, and prefer grass and leaves of various trees. The silk fibres separate out. Answer: Silk and wool are two fibres which are made up of proteins. There is a variety of silk moths which look very different from one another and the silk yarn they yield is different in textures (coarse, smooth, shiny, etc.) Answer: Fibres and fabric play a large role in everyday applications. CHAPTER â 3 FIBRE TO FABRIC CREATED BY â RAVI PRAKASH SINGH FOR CLASS â VIII SUBJECT â PHYSICS (SCIENCE) Thursday, January 18, 2018RAVI PRAKASH Woolen fibres are then processed to obtained woolen yarn. Is the pure silk saree more costly than an artificial one? Figure 1: Animals that yield wool Reeling is done in special machines. NCERT Extra Questions for Class 7 Science Chapter 3 Fibre to Fabric with Answers will help to score more marks in your CBSE Board Exams. (c) After 25 to 30 days, the caterpillars stop N eating and start spinning cocoons. Required fields are marked *. During these movement of head, the silkworm secrets fibre made of protein which hardens on exposure to air and becomes silk fibre (or silk thread). Answer: Wool yielding animals are sheep, yak, llama, alpaca, angora goat, angora rabbit and camel. The thread which burns giving a smell of burning paper will be artificial silk thread. Some of the silkworms (as pupae) are however, allowed to live and mature into silk moths so that they can lay eggs to produce more silkworms. The risks faced by people working in any industry due to the nature of their work are called occupational hazards. Name the disease that workers may at risk. The sorter’s job is very risky because sometimes, they get infected by the bacteria called ‘anthrax’ which cause a deadly blood disease called sorter’s disease. Correct sequence is CBSE Class 7 Science - Chapter 3 - Fibre to Fabric - NCERT Book Chapter PDF Download from here in a single click or you can also view chapter. Burn them separately and observe the smell produced. What is fabric? It leads to a fatal blood disease called sorter’s disease. A single fibre is too weak to break but when it once made a fabric it is difficult to tear. The larvae of silk moth are called caterpillar or silkworm. The larvae are kept in clean bamboo trays along with young and freshly chopped mulberry leaves. 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