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