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. Fig. Ans. (b) Animals fibers are silk and wool. The silkworm takes three to seven days to prepare the cocoon, formed by about 20-39 concentric layers of a single thread. 2. Sep 28,2020 - What is the maximum length of the silk obtained from cocoon Related: Very Short Question Answers - Fibre to Fabric? x. Yarn is made from fibre. Answer: Cotton is obtained from the fruits of the cotton plant, called cotton balls. The fibres obtained from plants and animals are called natural fibres. NCERT Solution for Class 6 Science. • Eggs are warmed to a suitable temperature for the larvae to hatch from the eggs. 4.Question. These fibres are not obtained from plant or animal sources. MCQ Questions for Class 7 Science: Ch 3 Fibre to Fabric. viii. Silk fibres are used for weaving silk cloth. xii. 4. 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. The origins of silk date back to Ancient China. 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. 3. Describe the process of obtaining silk fibres from the cocoon. (False) (g) Polyester is a natural fiber. Q.4. The fibres are of two types:1 Natural fibres 2 Synthetic fibres. These machines unwind the fibers of silk or threads from the cocoon. ix. plants and animals. Answer. For obtaining good quality silk filaments, the cocoons are boiled before the moth can emerge from them. Q7: Name two items that are made from Jute fibre. (False) 3.Question. The silk fibres so obtained are weaved to make silk cloth. 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 (E) True (F) False : Silk fibre is obtained from silkworm (animal). View Answer. Plant fibres are obtained from fruits and stems. MCQ Questions for Class 7 Science: Ch 3 Fibre to Fabric. The fibres obtained from plants and animals are called natural fibres. • The larvae are kept in clean trays along with freshly chopped mulberry leaves. Silkworms are fed on mulberry leaves. Learn Videos. 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. It is also obtained from the hair of rabbits, yaks and camels. A silk saree. The silk moth lives on the leaves of mulberry plants. Silk is natural, not a man-made polymer. Different types of silk, with different textures, are obtained from different varieties of silk moths. by the weavers. Silk: Cocoon, Wool: ____ … 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. 1. Silk fibre is obtained from the cocoon of the silk moth. (d) True, the process in which fibres are separated from the seeds of cotton by combing, is called ginning of cotton. Types of Fibres, Fibre to Fabric, Class 6. Silk has set the standard in luxury fabrics for several millennia. Q3. What are synthetic fibres? Silk fibres are drawn from the cocoon of the silkworm. Silk thread is obtained from (a) Cocoon (b) Caterpillar (c) Pupa (d) Adult moth (a) Cocoon. Jute fibre is obtained from the stem of the jute plant. SOLUTION: (A) True (B) False : Spinning is the process of making yarn from fibres. ; 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. Fibre to Fabric NCERT – Question: Define the term ‘selective breeding’. Silk is obtained from. | EduRev Class 7 Question is disucussed on EduRev Study Group by 115 Class 7 Students. Fibre to Fabric Class 7 Extra Questions HOTS. We get silk from silk worm. Check the below NCERT MCQ Questions for Class 7 Science Chapter 3 Fibre to Fabric with Answers Pdf free download. 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. Silk fibre obtained from Silk moth is a kind of of Insect secretion. 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. Class 7 Chemistry Fibre to Fabric: Silk: Silk . (g) Polyester is a natural fibre. Question 1. 3.9). Chapter 3 - Fibre to Fabric. Example: Cotton, jute, silk, wool, etc. Silk fiber is obtained from the cocoons of the silk moth. 2. From which parts of the cotton and jute are obtained? Example: Nylon, Polyester and Acrylic. View Answer. Classify the following fibres as natural or synthetic: nylon, wool, cotton, silk, polyester, jute. xi. Write a short note on silk. 13 min. True. Man-made or Synthetic Fibre The fibres which are prepared from chemical substances in factories are called synthetic fibres. Can you explain this answer? Silk worms are cultivated by farmers in rural areas by feeding mulberry leaves to the worms 2. (e) True, as the process of arranging two sets of yarns together to make a piece of fabric is called weaving. This cocoon is sent for processing to produce a silk cloth. (f) False, as silk fibre is obtained from the cocoon … The scientific name of the Silk moth is Bombyx Mori. Cotton fibres Wool fibres Silkworm 2. (C) False : Jute is obtained from jute plant (Corchorus). (F) Silk fibre is obtained from the stem of a plant. 1. There is a chain of method in manufacturing Silk from Cocoons. Silk fibers are then converted into silk threads to make different kinds of silk fabrics like silk sarees, etc. Why is silk obtained by mulberry silk moth most popular? 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 moth: The pupa inside the cocoon develops into a silk moth and the life cycle of the silkworm is completed. Silk is an expensive fabric. silk fibres and turns into pupa. (a) Plant fibers are obtained from cotton and jute. This covering is known as cocoon . Female silk moth lay eggs. • After 25 to 30 days the caterpillar stops eating and start spinning cocoon. Question 2. The larva of the silk moth is called caterpillar. (f) Silk fiber is obtained from the stem of a plant. 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. There are four stages in the life cycle of silk moth: eggs, larva, pupa and adult. Silk fibres are then spun into silk threads, which are finally woven into silk cloth by weavers. Cocoon: This is the pupa stage where the silkworm completes the formation of cocoon in a week under ideal conditions. Nov 20,2020 - Silk thread is obtained froma)Cocoonb)Caterpillarc)Pupad)Adult mothCorrect answer is option 'A'. | EduRev Class 7 Question is disucussed on EduRev Study Group by 112 Class 7 Students. In which of the following process, threads are taken out from the cocoons? Study Materials ... What is the process of taking out silk threads from the cocoon known as? Silk is warm to wear during winters and cool in summer. Answer. MCQ Questions for Class 7 Science with Answers are. Question: Write the maximum length of continuous silk thread that can be obtained from a cocoon.

how is silk obtained from cocoon class 6th

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