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