how is silk obtained from cocoon class 6th

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

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