what are silk fibres made up of class 7
• Wool is obtained from the fleece (hair) of sheep or yak. Silk: Silk is also a natural textile fibre which is obtained from silkworms. Artificial silk (called rayon) is obtained from wood pulp and it is made of modified plant material ‘cellulose. Silk is a natural fibre which is obtained from an insect (called silk moth). We have Provided Fibre to Fabric Class 7 Science MCQs Questions with Answers to help students understand the concept very well. The silkworms eat day and night and grow. Question 2 What are the characteristics of silk fibres obtained from the cocoons of silk moth? The rearing of silkworm to obtain silk is known as sericulture. A silk saree. 2. The long silk fibres are obtained by unwinding the threads from cocoons. Question 4 What is meant by reeling the silk? Plant fibres: These are the ones that are obtained from plants. After about 25 to 30 days, the silkworms stop eating and get ready to spin cocoons.The silkworms climb the twigs placed near them and spin cocoons of silk fibres. a) Yarn is made from fibres b) Spinning is a process of making fibres c) Jute is the outer covering of coconut d) The process of removing seed from cotton is called ginning. A fibre is a hair-like strand of material. (c) Mooga silk. Cotton and jute are examples of fibres obtained from plants. (1) Rearing of Silkworms to Obtain Cocoons, (2) Processing of Cocoons to Obtain Silk Fibres, (3) Converting Silk Fibres into Silk Cloth. 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? What are the common health problems found in the people who work in silk industry? Question: What are the uses of wool? Last Updated on March 20, 2019 By Mrs Shilpi Nagpal Leave a Comment. Fibres are very thin, thread-like strands from which fabrics (or cloths) are made. (4) When the pupa (encased in cocoon) develops fully to form an adult silk moth, then the cocoon splits up and a beautiful silk moth comes out. The rearing of silkworms to obtain silk is termed as sericulture. 7.3.1. All material given in this website is a property of physicscatalyst.com and is for your personal and non-commercial use only, Gravitation NCERT Solutions Class11 physics, Trigonometry Formulas for class 11 (PDF download), Newton�s law Interesting conceptual questions, Difference between resistance and resistivity, Fibre to Fabric Class 7 Important Questions, Science Foundation Course For JEE/NEET/NSO/Olympiad - Class 7, CBSE All In One Science Class 7 by Arihant Experts (Author), IIT Foundation Physics, Chemistry & Maths for Class 7. These solutions for Animal Fibres are extremely popular among Class 7 students for Science Animal Fibres Solutions come handy for quickly completing your … Longitudinal view One such fabric is silk, sometimes called the “queen of the fabrics.” Its original development was in ancient China. Natural fibres themselves also differ from man-made artificial and synthetic fibres. Silk is produced from a silkworm. (Paper is also made of cellulose obtained from wood pulp). Answer: Silk and wool are two fibres which are made up of proteins. These ncert book chapter wise questions and answers are very helpful for CBSE exam. In this way, the life history of silk moth is completed. This breaking of cocoon causes damage to its silk threads and hence lowers the quality of silk. Question 16. Check the below NCERT MCQ Questions for Class 7 Science Chapter 3 Fibre to Fabric with Answers Pdf free download. The pile of cocoons is placed in hot water. China is the largest silk producer and consumer in the world followed by India where Indian sarees made from silk … Loading lessson... Next . Fibres can be spun into yarn and made into fabric.