Ans : Fibres that are obtained from nature, i.e., from plants and animals are called natural fibres and those made by humans by chemical methods are known as synthetic fibres. What is the nature of silk fibre obtained from the cocoon of mulberry silk moth? How is Silk … mention any two. 1. silk fibre is obtained from the stem of a plant. Answer: Cotton – Cotton bolls (from the surface of cotton seeds) (fruit) Jute – Stem; Question: Name two items that are made from coconut fibre. Fill in the blanks:- ️ (a) Plant fibres are obtained from _____ and _____. Answer: Jute fibres are obtained from the stems of the jute plant. Silk fibres obtained from cocoons are spun (twisted) to form silk threads called silk yarn. Differentiate between the eri silk and other types of silk. In this way, the life history of silk moth is completed. After harvesting, the stalks of … Silk is formed in liquid form in the two glands in the silkworms’s head. (4) When the pupa (encased in cocoon) develops fully to form an adult silk moth, then the cocoon splits up and a beautiful silk moth comes out. The soft looking silk yarn is as strong as a comparable thread of steel. f) Silk fibre is obtained from the stem of a plant g) Polyester is a natural fibre. Answer (c) Question 5. Question 6 Describe the life history of silk moth? Previous Next. Question 17. 4. This helps in separating out the silk fibres. The process of taking out silk fibres from the cocoons for use as silk is called reeling. Selective breeding is a process of (a) selecting the offsprings with desired properties. The silkworms feed on the leaves of mulberry tree and grow bigger in size. After 25-30 days, the silkworms stop eating and get ready to spin cocoons. Answer: (a) Plant fibers are obtained from cotton and jute . Answer 4: Cotton is obtained from the fruits of the cotton plant, called cotton balls. The larvae of silk moth are called caterpillars or silkworms. f) Silk fibre is obtained from the stem of the plant. When the eggs hatch, silkworms come out of the eggs. How is Silk … Answer: The next stage of caterpillar in the life cycle of silk moth is called pupa. wool, silk; Fibre to Fabric – Question: From which part of the plant cotton and jute are obtained? Silk moth is a kind of insect. The silky covering spun by the silkworm (or caterpillar) of silk moth is called cocoon. The cocoons having developing silkworms inside them are used to obtain silk. Synthetic fibre: The fibre which are synthesized in industry from simple chemicals obtained from petroleum are called synthetic fibre. Filed Under: Class 7, Fibre to Fabric, Science Tagged With: artificial silk, cocoon, life history of silk moth, mulberry silk, natural silk, production of silk, pupa, rayon, Rearing of Silkworms, reeling, sericulture, silk, silk yarn, silkworm, varieties of silk. In order to produce silk, the silkworm developing inside the cocoon (as pupa) is not allowed to mature into an adult silk moth. Examples: cotton, jute, silk, wool. (2) The eggs hatch to form worm-like larvae. Question 3  How will you distinguish between natural and artificial silk? In India, cotton is … Natural silk is an animal fibre. The silkworms are fed cut-up mulberry leaves. Artificial silk is obtained from wood pulp and it is made up of modified plant material ‘cellulose’. From which parts of the plant cotton and … Examples: Nylon, Acrylic, Polyester. This is because if the silkworm (as pupa) is allowed to mature into a silk moth, then the fully formed silk moth secretes a liquid to dissolve a part of silk of the cocoon to break it so as to come out of it and fly away. 2009-04-29 18:31:44 2009-04-29 18:31:44 . Some of the varieties of silk are : Mulberry silk; Tassar silk ; Mooga silk ; Kosa silk; and Eri silk. Answer-False Q3. Page No 32: Question 6: How is jute fibre made from the jute plant? The silk obtained from the cocoons of mulberry silk moth is called mulberry silk. After about 25 to 30 days, the silkworms stop eating and get ready to spin cocoons.The silkworms climb the twigs placed near them and spin cocoons of silk fibres. The silkworms are fed mulberry leaves. B) Fat done clear. Silk fibre is made of a protein. big in size. Silk fibre made of How silk is made from silkworm yak How does sericulture done what isrearing 1.What changes take place in the Pupa stage of silkworm? Your email address will not be published. Q4. Silk fibres are converted into silk yarn which is used for making silk cloth. Jute fibre is obtained from the stem of the jute plant. Egg——> Larva(caterpillar) ——> Pupa ——> Silk moth. What is pupa? Hot water makes the silk fibres of cocoons to separate out. Natural silk is obtained from the cocoons of silkworms and it is made of a ‘protein’. The long silk fibres are obtained by unwinding the threads from cocoons. Pupa is a stage in the life history of silk moth when the caterpillar (or silkworm) becomes ‘encased’ in a hard shell of silk fibres called cocoon. carefully on paper strips (or cloth strips) and sold to silkworm farmers. Answer: … Answer: It is soft, lustrous and elastic. 2. Natural silk is an animal fibre. 3. Question 5. Wool, cotton, silk and jute are … What is the nature of silk fibre obtained from the cocoon of mulberry silk moth? Answer– True (d) Silk fibre is obtained from the stem of a plant. Artificial silk (called rayon) is obtained from wood pulp and it is made of modified plant material ‘cellulose. Question: Write a caption for each of the figures given as figure (a-d). Classify the following fibers as natural or synthetic: nylon, wool, cotton, silk, … The adult female silk moth then lays more eggs. fibres and the developing silkworm (as pupa) gets killed. D) Sugars done clear. 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