There are following two types of fibres that form the hair to sheep. Accidentally, a cocoon dropped into her cup of tea and a tangle of delicate threads separated from the cocoon.               ↓ v) The fibres are then dyed in different colours. MCQ Questions for Class 7 Science with Answers are prepared as per the Latest Exam Pattern. The farmers keep eggs under hygienic condition. Answer: Rampur bushair and Bakharwal are the breeds of sheep. The most common silk moth is the mulberry silk moth. Wool is obtained from the fleece fleece (hair) of sheep or yak.               ↓ The small fluffy fibres, called burrs, are picked out from the hair (burrs are soft, fluffy fibres in wool). Answer: Wool industry is an important source of livelihood for many people in our country. Silk fibres It leads to a fatal blood disease called sorter’s disease. The wool is obtained mainly from animals like sheep, yak and goat. For obtaining pure silk, we have to rear silk moth, their larvae to get pupa. (e) Female silk moths lay eggs. vi) The fibres are then straightened, combed and rolled into yarn. 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. 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 24 SCIENCE 3 Fibre to Fabric I n Class VI you have learnt about some fibres obtained from plants.               ↓ A fibre is a hair-like strand of material. Wool is obtained from the fleece (hair) of sheep or yak. The larvae of silk moth are called caterpillar or silkworm. Silk is a natural fibre which is obtained from an insect (called silk moth). Scouring makes the fleece of sheep clean. The larvae are kept in clean bamboo trays along with young and freshly chopped mulberry leaves. Shearing does not hurt the sheep because the uppermost layer of the skin of sheep is ‘dead’. Also you can give online test and analyze your preparation level. Answer: Fibres and fabric play a large role in everyday applications. Fabric needs more energy to tear apart as compared to a single fibre. How her mother distinguished between pure silk saree and an artificial silk saree? The fleece (or hair) of sheep provides woolen fibres. To obtain silk for commercial purposes, a large number of cocoons (containing living pupa) are killed. She took out a thread from the edge of the two sarees shown by the shopkeeper and burnt After scouring, sorting is done. Just like silk, wool is also made up of proteins. NCERT Solutions for Class 7 Science Chapter 3 - Fibre To Fabric [FREE]. Artificial silk is obtained from wood pulp and it is made up of modified plant material ‘cellulose’. This process is called shearing. In sorting, the hairy skin is sent to a factory where hair of different textures are separated or sorted. 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. The silk obtained from the cocoons of mulberry silk moth is called mulberry silk. Answer: The most common silk moth is the mulberry silk moth.               ↓ (cotton and jute are plant fibres). (d) The larvae/caterpillars or silkworms are kept in clean trays along with freshly chopped mulberry leaves. You can simply visit the link to go to amazon website and order online. Observation: We feel body hairs are softer than hairs on our head. So, it is cheap. You can buy Class 7 Science NCERT Book from various online platforms and get doorstep delivery in no time. This covering is known as cocoon. To get fastest exam alerts and government job alerts in India, join our Telegram channel. This document is highly rated by Class 7 students and has been The hair of sheep grow again before the onset of winter and protect them in cold weather. For obtaining silk, silk moths are reared and their cocoons are collected to get silk thread. Answer: Hair traps a lot of air which is a poor conductor of heat resulting their body warm. So, silk is an animal fibre. The thread which burns giving a smell of burning paper will be artificial silk thread. Answer: In first saree, one thread which burnt with a smell of burning hair is from pure silk, silk and hair are protein fibres. The silkworm continues to develop in the form of pupa inside the cocoon to form the silk moth. Answer: Life History of Silk Moth Formation of Silkworm. The silk obtained from the cocoons of mulberry silk moth is called mulberry silk. NCERT Book Class 6 Science Chapter 03: Fibre to Fabric PDF Class 6 is the main point of a student’s life, after which they take their career. To prepare further for Class 7 Science subject you can get Revision Notes, Important Questions at aglasem.com for free. Fibres can be spun into yarn and made into fabric. CHAPTER – 3 FIBRE TO FABRIC CREATED BY – RAVI PRAKASH SINGH FOR CLASS – VIII SUBJECT – PHYSICS (SCIENCE) Thursday, January 18, 2018RAVI PRAKASH For your convenience we have curated direct link to NCERT Book Class 7 Science so that you need not to keep search for it. You will have the PDF on your device to study offline. (iv) Scouring Answer: Neha’s mother took a thread of natural silk fabric and another thread of artificial silk fabric and burn them separately. After 25-30 days, the silkworms stop eating and start spinning the cocoons. NCERT Book for Class 7 Science Chapter 3 Fibre to Fabric is available for reading or download on this page. admin She also noticed that they were spinning shiny cocoons around them. All the study material was prepared to help you understand the topic easy and better way. As a result, natural silk is costly. The cocoon are kept under the sun, boiled water or exposed to steam. Thus, tassar silk, mooga silk, kosa silk, etc are obtained from cocoons spun by different types of moths. Class 7 Science NCERT Book NCERT Solutions. • You all know that food, clothing and shelter are the three basic needs of life. Copies of these textbooks may be downloaded and used as textbooks or for reference. Natural silk is an animal fibre. Wool is acquired from the fleece or hair of these animals. Step by Step answers to all the exercise questions are provided by experts to help you prepare better in your examination. The short woolen fibres are spun into fine yarn and then woven on a loom to make woolen clothes (like shawls, etc). 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. FIBRE TO FABRIC 19 Fig. The long woolen fibres are spun (or twisted) into thick yarn called wool which is used for knitting sweaters, etc. Silk fibres are converted into silk yarn which is used f… A female silk moth lays hundred of eggs at a time. are prepared as per the Latest Exam Pattern. The silkworms feed on the leaves of mulberry tree and grow bigger in size. Ajay is very caring, intelligent and sensible boy. Silk fibres are spun into silk threads which are woven into silk cloth by weavers. A single fibre is too weak to break but when it once made a fabric it is difficult to tear. (a) Eggs are warmed to a suitable temperature for the larvae to hatch from eggs. Woolen fibres are then processed to obtained woolen yarn. (c) After 25 to 30 days, the caterpillars stop eating and start spinning cocoons. Mulberry silk is soft, lustrous (shiny) and elastic and can be dyed in beautiful colors. Fibre to fabric 1. Answer: The stage next to caterpillar in the life cycle of silk moth is called pupa. After the final moulting begins, the last feeding period (of about ten days) after which the worm grows to its full size. They are the smallest visible unit of a fabric and denoted by being extremely long in relation to their width. Answer: The larva (or caterpillar) of a silk moth makes the silk fibre. Chapter 3 - Fibre to Fabric Everything Is Everything - II Loading lessson... Next Fullscreen Play Fullscreen Open Play Pause Choose {{current_item.currentQuestion.optionsRemainingToBeSelected}} more options Start … The white woolen fibre obtained by sorting can be dyed in different colors. Hope you like them and do not forget to like , social share and comment at the end of the page. They warm them to a suitable temperature for the larvae to hatch from egg. Answer: The process of taking out threads from the cocoons for use as silk is called reeling the silk. The eggs are stored carefully on strips of paper or cloth and sold to silkworm farmers. NCERT Solution for Class 7 Science Chapter, NCERT Solutions for Class 7 Science Solutions, The Invention of Vita-Wonk: 7th Class CBSE English Ch 07, Expert Detectives: 7 CBSE Honeycomb English Chapter 06, Quality: 7th Class CBSE Honeycomb English Chapter 05, The Ashes that Made Trees Bloom: 7th CBSE English Ch 04, Gopal and the Hilsa Fish: 7th Honeycomb English Ch 03, A Gift of Chappals: 7 Class CBSE Honeycomb English Ch 02, Three Questions: 7 Class CBSE Honeycomb English Ch 01. NCERT Solutions For Class 7 Science Chapter 3 (Fibre to Fabric) – In this article, we will provide you with the CBSE NCERT Solutions for Class 7 Science Chapter 3 – Fibre to Fabric. Answer: Wool yielding animals are sheep, yak, llama, alpaca, angora goat, angora rabbit and camel. Here you can read Chapter 3 of Class 7 Science NCERT Book. The process of taking out threads from the cocoon for use as silk is called reeling the silk. Then, it swings its head from side to side. CBSE Class 6 Science Notes Chapter 3 Fibre to Fabric Fibres: All cloth materials are made up of long, narrow, thin structures called fibres. Download NCERT Chapters and Books in pdf format.Easy to print and read. So, a piece of woollen fabric also burns giving the smell of burning hair. NCERT Book for Class 7 Science Chapter 3 Fibre to Fabric is available for reading or download on this page. The thread which burns giving a smell of burning paper will be cotton fibres. Neha’s mother is intelligent and knowledgeable. With the help of the link provided below. It is a natural silk and is an animal fibre. There is a variety of silk moths which look very different from one another and the silk yarn they yield is different in texture (coarse, smooth, shiny, etc). Answer: In Tibet and Ladakh, angora goats are found. 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. We find that a fabric (v) Sorting The thread which burns giving a smell of burning hair will be natural silk (or pure silk). Silk 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. Select chapter you wish to download and its done. Answer: Fibre (marked 1) which is used in filling quilts is cotton and fibre (marked 2) is jute. The hair of the sheep are shaved off by using a saving machine similar to that used by barbers. Fibre to fabric 2. The empress found white worms eating up mulberry leaves. Their food also contain a mixture of pulses, corn, jowar, oil cakes (material left after taking out oil from seeds) and minerals. You can refer to NCERT Solutions for Class 7 Science Chapter 3 Fibre to Fabric to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams. 1,610 Views. (f) Cocoons are kept under the sun or boiled in water. Small racks or twigs may be provided in the trays to which cocoons get attached. In order to produce silk, the silkworm developing inside the cocoon (as pupa) is not allowed to mature into an adult silk moth. (b) Silkworm (wool and silk are animal fibres). 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. 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. So, on burning cotton and paper both give similar smell. Thus, tassar silk, kosa silk, mooga silk, etc are obtained from cocoons spun by different types of moths. Correct sequence is It is obtained from the cocoons of mulberry silkworm and is made up of protein. 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. Your email address will not be published. The female silk moth lays eggs on mulberry leaves. 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. The subjects that the students take in their class 12 is also the basis for their career choice they take up. The same quality wool obtained are then mixed together. Artificial (synthetic) silk called rayon is obtained from wood pulp and it is made of modified plant material cellulose. The eggs are hatched into very small larvae within a week. (e) Female silk moths lay eggs. Answer: Digital NCERT Books Class 7 Science pdf are always handy to use when you do not have access to physical copy. This Solution has detailed answers to help you study thoroughly. MCQ Questions for Class 6 Science with Answers are prepared as per the Latest Exam Pattern. There they found that the artificial (synthetic) silk was much cheaper and wanted to know why. 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. Paheli went to the market to buy sarees for her mother. (c) After 25 to 30 days, the caterpillars stop N eating and start spinning cocoons. Every section of wool obtained after sorting contains the same quality wool. It is easy to download the NCERT Class 7 Books. 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. To gain comprehensive knowledge on chapter Fibre to fabric we provide you With NCERT solutions for class 7 science chapter Fibre to fabric. So, on burning these threads, a smell of burning hair comes out. The wool which is used for knitting sweaters or for weaving shawls is the finished product of a long process. Silkis a fine, strong, soft and shining fibre produced by silkworms in making their cocoons. 24 SCIENCE 3 Fibre to Fabric I n Class VI you have learnt about some fibres obtained from plants. Synthetic silk can be prepared at a large scale in factories / mills. Here we have given NCERT Class 6 Science Notes Chapter 3 Fibre to Fabric. The quality of woolen cloth depends on the breed of sheep from which wool is obtained. (f) Cocoons are kept under the sun or boiled in water. Answer: Artificial silk is a plant fibre. Mulberry silk is soft, lustrous (shiny) and elastic and can be dyed in different colors. Answer: (b) Fibres are taken out from the cocoon. Now-a-days scouring is done by machines. 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. 3.3 Pulling a thread from a fabric Fig.3.4 Splitting the yarn into thin strands Fig. This process of washing of sheared hair is called scouring. The covering of silk fibres inside which the caterpillar covers itself is called cocoon. The thread which burns giving a smell a burning paper will be an artificial silk. Answer: Llama and alpaca are found in South America. Answer: Yak wool is common in the hilly regions of Ladakh. The fleece of sheep (or cut hair of sheep) contains dust, dirt, dried sweat and grease, etc. Answer: Different types of silk are mulberry silk, tassar silk, mooga silk and kosa silk. 3.5 Yar n split up into thin strands yarns are visible, you can gently pull one out with a pin or a needle. Answer: A pile of cocoon is used for obtaining silk fibre. 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). 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.) Silk fibre is made of a protein. When the silkworm (or caterpillar) is ready to enter the next stage of its development called pupa, it first weaves a net to hold itself. Recent Posts Sanskrit Class 10 – Chapter 5- जनन त ल यवत सल You also learnt that wool and silk fibres are obtained from animals. While sleeping, its skin cracks and on awakening, the worm leaves the old skin and comes out in a new one. Here you can get the NCERT Book for Class 7 Science Chapter 1 Fibre to Fabric. The shearing (cutting the hair) of sheep is done in hot weather of summer so that sheep may survive without their protective coat of hair. NCERT Class 6 Science Food Fibre to Fabric. 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. What is fabric? (c) Cocoon NCERT Books chapter-wise Solutions (Text & Videos) are accurate, easy-to-understand and most helpful in Homework & Exam Preparations. 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. Download PDF of Fibre to Fabric Class 7 Science Notes on BYJU’S. Class 7 Chapter 3 Activity NCERT Science Class 7 Chapter 3 Class 7 Fibre to Fabric Activity Answers Activity 3.1 Activity 3.1 asks us to feel and compare the hairs present on our head and skin. The silk fibres separate out. The silk fibres separate out. The fibres are straightened, combed and rolled into yarn. They are then spun and woven into fabric. Soon the silkworm (or caterpillar) covers itself by silk fibres and turns into pupa. Is the pure silk saree more costly than an artificial one? (i) Picking out the burrs In this way, the first silk industry began in China. If you like our resources, please share the post!. 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. (d) The larvae/caterpillars or silkworms are kept in clean trays along with freshly chopped mulberry leaves. Answer: The first step is shearing then scouring. (d) Cocoon with developing moth. 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. (g) Fibres are taken out from the cocoon. To get silk thread, we have to dip cocoon in hot water to get silk thread which is wrapped over the cocoon. Fibre to Fabric Class 7 Science Extra Questions Long Answer Type Question 1. The cocoons are collected and boiled in water to kill the insect inside them. So, the sheared hair of sheep are thoroughly cleaned by washing with soap (or detergent) and a lot of water in tanks. The risks faced by people working in any industry due to the nature of their work are called occupational hazards. class 6 science worksheets Chapter 3 - Fibre to Fabric Academic team of entrancei uploaded Important questions & worksheet for class 6 science Chapter 3 - Fibre to Fabric . In this page, we are providing Fibre to Fabric Class 7 Extra Questions and Answers Science Chapter 3 pdf download. We hope the NCERT Solutions for Class 7 Science Chapter 3 Fibre to Fabric help you. Just click on the link, a new window will open containing all the NCERT Book Class 7 Science pdf files chapter-wise. Artificial silk is obtained from wood pulp and it is made of modified plant material ‘cellulose’. Paper is made of cellulose obtained from wood pulp. Yes, pure silk saree is more costly than an artificial one. The thread which burns giving a smell of burning hair will be pure silk thread. Reeling is done in special machines. Name the disease that workers may at risk. Answer: Wool is obtained from the fleece or hair of sheep. Take a thread of pure silk and another thread of an artificial (synthetic) silk. Answer: Natural silk is obtained from the cocoons of silkworms and it is made up of a protein. (After this, the fibres are scoured again and dried. NCERT Class 6 Science Solutions are very helpful for students to clear their concepts. Cotton and paper both are carbohydrates. 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Different colours for Class 7 Science Chapter 3 of Class 7 Science NCERT Book for Class Science... Practice Papers etc amazon website and order online, social share and at. Clothing and shelter are the three basic needs of life Science tuition Vedantu.com... Sheep or yak, wool is obtained mainly from animals sorter ’ s disease of protein breeds of sheep again! In India, join our Telegram channel is jute select Chapter you wish to download and its..