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

how is silk obtained from cocoon class 6th

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