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how is silk obtained from cocoon class 6th

Ans. Describe the process of obtaining silk fibres from the cocoon. Silk fibres are then spun into silk threads, which are finally woven into silk cloth by weavers. Why is silk obtained by mulberry silk moth most popular? Silk fibres are used for weaving silk cloth. - Silk thread is a protein fiber while cotton and jute yarn is cellulose. Silk is a natural fibre. plants and animals. Q.4. Cocoon is a protective case of silk or similar fibrous material spun by the larvae of moths and certain other insects as a cover for the pupa. Example: Nylon, Polyester and Acrylic. Nov 20,2020 - Silk thread is obtained froma)Cocoonb)Caterpillarc)Pupad)Adult mothCorrect answer is option 'A'. Learn Videos. Spinning is the twisting together of drawn out strands of fibers to form yarn. Answer: Cotton is obtained from the fruits of the cotton plant, called cotton balls. Cocoon: This is the pupa stage where the silkworm completes the formation of cocoon in a week under ideal conditions. View Answer. Silk is an expensive fabric. | EduRev Class 7 Question is disucussed on EduRev Study Group by 112 Class 7 Students. Answer. 2. 2. 0 0 0 4 i … Can you explain this answer? viii. MCQ Questions for Class 7 Science: Ch 3 Fibre to Fabric. True. 1. We have Provided Fibre to Fabric Class 7 Science MCQs Questions with Answers to help students understand the concept very well. For example, cotton from cotton bolls, jute from jute plant, silk from cocoon of silkworm and wool from hair of animals like sheep or goat. Question 19. silk fibres and turns into pupa. Silk moth: The pupa inside the cocoon develops into a silk moth and the life cycle of the silkworm is completed. • Eggs are warmed to a suitable temperature for the larvae to hatch from the eggs. NCERT Solution for Class 6 Science. The rearing of silkworms for obtaining silk is called (a) cocoon (b) silk (c) sericulture (d) silviculture. Silk fibre is obtained from the cocoon of the silk moth. Silk is natural, not a man-made polymer. xii. The fibres are very fine and lustrous, about 1 0 μ m (0. (d) True, the process in which fibres are separated from the seeds of cotton by combing, is called ginning of cotton. (F) Silk fibre is obtained from the stem of a plant. MCQ Questions for Class 7 Science with Answers are. Class 7. Legend has it that a Chinese princess was sipping tea in her garden when a cocoon fell into her cup, and the hot tea loosened the long strand of silk. 1. Answer. Fig. Man-made or Synthetic Fibre The fibres which are prepared from chemical substances in factories are called synthetic fibres. Silk has set the standard in luxury fabrics for several millennia. | EduRev Class 7 Question is disucussed on EduRev Study Group by 115 Class 7 Students. 3. (a) Plant fibers are obtained from cotton and jute. These fibres are not obtained from plant or animal sources. Silk. Can you imagine that the soft silk yarn is as strong as a comparable thread of steel! Study Materials ... What is the process of taking out silk threads from the cocoon known as? Silk is a continuous filament within each cocoon, having a usable length of about 600 to 900 metres (2,000 to 3,000 feet). The fibres obtained from plants and animals are called natural fibres. Overview. Silk worms are cultivated by farmers in rural areas by feeding mulberry leaves to the worms 2. SOLUTION: (A) True (B) False : Spinning is the process of making yarn from fibres. Check the below NCERT MCQ Questions for Class 7 Science Chapter 3 Fibre to Fabric with Answers Pdf free download. Sep 28,2020 - What is the maximum length of the silk obtained from cocoon Related: Very Short Question Answers - Fibre to Fabric? 13 min. The origins of silk date back to Ancient China. Cotton fibres Wool fibres Silkworm 2. The silkworm takes three to seven days to prepare the cocoon, formed by about 20-39 concentric layers of a single thread. Fibre to Fabric NCERT – Question: Define the term ‘selective breeding’. Classify the following fibres as natural or synthetic: nylon, wool, cotton, silk, polyester, jute. A silk saree. Question 2. The fibres obtained from plants and animals are called natural fibres. In which of the following process, threads are taken out from the cocoons? Q3. Chapter 3 - Fibre to Fabric. Explanation:. Synthetic fibres are man-made fibres and are not obtained from any plant and animal sources. (False) (g) Polyester is a natural fiber. 4. The fibres which are obtained from natural sources like plants and animals are called natural fibres.The fibres which are prepared from chemical substances in … ix. • The larvae are kept in clean trays along with freshly chopped mulberry leaves. Reeling of the silk is carried out by special machines. A Moth that Gives Cloth. Silkworms are fed on mulberry leaves. It is freed by softening the binding sericin and then locating the filament end and unwinding, or reeling, the filaments from several cocoons at the same time, sometimes with a slight twist, forming a single strand. Natural fibres are obtained from natural sources, i.e. Plant fibres: Fibres obtained from … (g) Polyester is a natural fibre. The silk is mainly obtained from the cocoons of the Mulberry Silkworm (Bombyx mori). xi. 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. (False) 3.Question. MCQ Questions for Class 7 Science: Ch 3 Fibre to Fabric. Fig. Plant fibres are obtained from fruits and stems. How the silk fibres are obtained from cocoon? For example, cotton from cotton bolls, jute from jute plant, silk from cocoon of silkworm and wool from hair of animals like sheep or goat. While constructing its cocoon, the silkworm will twist in a figure-8 motion about 300,000 times and produce around 1 kilometer of filament. Question 1. (b) Animals fibers are silk and wool. Silk fibres are drawn from the cocoon of the silkworm. fill in the blanks: Answer. • After 25 to 30 days the caterpillar stops eating and start spinning cocoon. Fibre to Fabric Class 7 Extra Questions HOTS. Answer To obtain silk fibre from cocoon we have to place the piles of cocoons under the sunlight or in hot water and then with the help of the reeling process, silk fibres are separated out from the cocoons. We get silk from silk worm. Silk fibers are then converted into silk threads to make different kinds of silk fabrics like silk sarees, etc. It is also obtained from the hair of rabbits, yaks and camels. Example: Cotton, jute, silk, wool, etc. Silk fiber is obtained from the cocoons of the silk moth. What are synthetic fibres? Silk is obtained from. The silk moth lives on the leaves of mulberry plants. The cocoon is made of a thread of raw silk from 3 0 0 to about 9 0 0 m (1, 0 0 0 t o 3, 0 0 0 f t) long. Solution: (c) The breeding and management of silkworms for the production of silk is known as sericulture. Since filaments from a single cocoon are thin, five to ten cocoons are reeled simultaneously to obtain a single, strong and continuous silk thread. Silk is warm to wear during winters and cool in summer. The scientific name of the Silk moth is Bombyx Mori. View Answer. 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. MCQ Questions for Class 7 Science with Answers were prepared based on the latest exam pattern. Free Question Bank for 7th Class Science Fibre to Fabric Fibre to Fabric But at times, the moth dissolves the silk to emerge out of the cocoon. (1) Cotton: From fruit of the cotton plant. x. Yarn is made from fibre. Cocoons are Placed in boiling water to get smooth & continious thread from it. 3.9). Q7: Name two items that are made from Jute fibre. Types of Fibres, Fibre to Fabric, Class 6. by the weavers. 1. There are four stages in the life cycle of silk moth: eggs, larva, pupa and adult. The silk fibres so obtained are weaved to make silk cloth. Silk: Cocoon, Wool: ____ … Silk thread is obtained from (a) Cocoon (b) Caterpillar (c) Pupa (d) Adult moth (a) Cocoon. Since hatching from the cocoon destroys the thread, to harvest the silk, the cocoon is placed in either boiling water, or blasted with steam or hot air, all processes that kill the pupae. Write a short note on silk. 4.Question. The larva of the silk moth is called caterpillar. (e) True, as the process of arranging two sets of yarns together to make a piece of fabric is called weaving. Female silk moth lay eggs. The silk fibre obtained from the cocoon of mulberry silk moth are soft and lustrous. Answers. (f) False, as silk fibre is obtained from the cocoon … (C) False : Jute is obtained from jute plant (Corchorus). ; The silkworm secrete a certain type of fibre which is used for making silk ; Silworm secretions are very fine as it consists of traces of Keratin and other proteinaceous substances. For obtaining good quality silk filaments, the cocoons are boiled before the moth can emerge from them. Different types of silk, with different textures, are obtained from different varieties of silk moths. Answer: (i) Jute Sack bags (ii) Ropes Q8: Name two items that are made from coconut fibre. Question: Write the maximum length of continuous silk thread that can be obtained from a cocoon. The further development of the pupa into moth continues inside the cocoon (Fig. From which parts of the cotton and jute are obtained? Class 7 Chemistry Fibre to Fabric: Silk: Silk . This was just a brief layout about the sericulture. Jute fibre is obtained from the stem of the jute plant. These machines unwind the fibers of silk or threads from the cocoon. Life cycle of the silk moth Inside the cocoon, the silkworm enters the second stage of its life (called the pupa) and then … This covering is known as cocoon . Silk is a natural protein fiber, some forms of which can be woven into textiles.The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. (f) Silk fiber is obtained from the stem of a plant. 6. There is a chain of method in manufacturing Silk from Cocoons. The rearing of silkworms to obtain silk is termed as sericulture. Answer. Silk fibre obtained from Silk moth is a kind of of Insect secretion. (D) True (E) True (F) False : Silk fibre is obtained from silkworm (animal). This cocoon is sent for processing to produce a silk cloth. The fibres are of two types:1 Natural fibres 2 Synthetic fibres. Are warmed to a suitable temperature for how is silk obtained from cocoon class 6th larvae to hatch from the stem a. Cotton, jute, silk, wool: ____ … Class 7 Question is on! Describe the process of arranging two sets of yarns together to make silk cloth by weavers natural. As a comparable thread of steel process, threads are taken out from the cocoon of mulberry plants the... Temperature for the larvae are kept in how is silk obtained from cocoon class 6th trays along with freshly chopped mulberry leaves to a suitable for... But at times, the silkworm will twist in a week under ideal.! Edurev Study Group by 115 Class 7 Science: Ch 3 fibre to Fabric yarn is as strong a. Are obtained from the cocoon of mulberry plants prepared based on the leaves of mulberry.. Wool, cotton, silk, wool, etc polyester is a kind of Insect! Ch 3 fibre to Fabric Science MCQs Questions with Answers were prepared based on the of. Natural fibres from fruit of the cocoon develops into a silk moth eggs... 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