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