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Meghna Thapar 5 years, 10 months ago
Polyester is a synthetic fibre made up of many repeating units of esters. Example – Terylene is popular polyester.
Properties of polyester:
- It is stronger than nylon.
- It is wrinkle resistant.
Uses of polyester:
- It is used in making sails of sail-boats.
- It is used in making fabrics for sarees, dress materials and curtains.
Nylon is a synthetic fibre. It is made in 1931 without using any natural raw materials. It is made from coal, water and air. It was the first fully synthetic fibre.
Properties of nylon:
- It is very strong, fairly elastic, lightweight and lustrous.
- It absorbs very little water so clothes made from nylon are easy to wash and quick to dry.
Uses of nylon:
- It is used in making textiles like sarees, shirts, socks, etc.
- It is used in making curtains, sleeping bags and tents.
Posted by Manlabai.Veerayya Swami 6 years, 5 months ago
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Meghna Thapar 5 years, 10 months ago
Rayon is a man-made fibre prepared from a natural raw material called cellulose by chemical treatment. It is obtained by the chemical treatment of wood pulp. Nylon is a synthetic fibre. It is made in 1931 without using any natural raw materials. It is made from coal, water and air. It was the first fully synthetic fibre. Polyester is a synthetic fibre made up of many repeating units of esters. Example – Terylene is popular polyester.
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Sia ? 6 years, 5 months ago
A. Cultivation is not possible without irrigation.
B. There are some areas in India where rainfall is not adequate so there is need to develop irrigation facilities.
C. Maximum cash crops like rice, wheat, sugarcane require adequate amount of water at regular intervals so there is need to develop irrigation facilities.
D. HYV seeds need proper irrigation.
E. The objective to get maximum yield can not be fulfilled without irrigation.
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Meghna Thapar 5 years, 6 months ago
Synthetic fibers are made from small molecules synthesized polymers. The substances used to produce such fibers are extracted from raw materials such as chemicals based on petroleum or petrochemicals. Such materials are polymerized into a chemical that ties together two adjacent atoms of carbon. Like natural fibers, synthetic fibers do not easily take up colors. These fibers can burn faster than natural fibers. They are prone to damage to heat and easily melt.
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The practice of growing different crops in the same field alternatively, in a pre-planned succession is called crop rotation.
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Reproduction is important for the survival of all living things. Without a mechanism for reproduction, life would come to an end.
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Synthetic fibres have unique characteristics which make them popular dress materials, some of them given below-
- Synthetic fibres are strong and durable. They are long lasting as compared to natural fibres.
- They absorb very little water. They dry up quickly.
- They are wrinkle resistant. They do not get rumpled easily during washing and wear.
- They are light weight and extremely fine.
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Meghna Thapar 5 years, 10 months ago
Killing of snakes leads to the increase in number of rats which is a rodent and will eat away all the crops or food grains and thus destroy the production of food grains.
Killing of an animal will not increase the production of food grains.
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Meghna Thapar 5 years, 6 months ago
Amoebas eat algae, bacteria, plant cells, and microscopic protozoa and metazoa – some amoebas are parasites. They eat by surrounding tiny particles of food with pseudopods, forming a bubble-like food vacuole. The food vacuole digests the food. Pathogenic free-living amoebae are found in many natural and human-made microenvironments, mostly living by bacteria feeding. However, in certain situations they can cause serious infections in humans.
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