…………………. became the first Indian astonaut to go in space. (a) Kalpana Chaivla (b) Rakesh Sharma (c) Sunita Williams

…………………. became the first Indian astonaut to go in space. (a) Kalpana Chaivla (b) Rakesh Sharma (c) Sunita Williams
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1 Answer

Answer :

(b) Rakesh Sharma
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At what position is the earth from the Sun?

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Which planet is nearest to the Sun?

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What is the important feature of shifting cultivation? —

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Conserve Water

Description : Conserve Water

Last Answer : ⮚ Do not keep water taps running while brushing, shaving, washing or bathing. ⮚ In washing machines fill the machine only to the level required for your clothes. ⮚ Install water-saving toilets that ... ⮚ Build rain water harvesting system in your house. Even the President of India is doing this.

Environmental impact:

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Last Answer : Nuclear fission power reactors generate large quantities of radioactive fission waste products, which may remain dangerous for thousands of years. In addition these are no safe disposal methods. It is ... fusion (combining the small nucleus) of the atoms of certain elements such as Uranium-235

Nuclear fission:

Description : Nuclear fission:

Last Answer : Nuclear fission reaction are based on the fission of U235 nuclei by thermal neutrons

NUCLEAR ENERGY

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Bio-mass Energy

Description : Bio-mass Energy

Last Answer : ⮚ Bio-mass is the organic matter produced by the plants or animals which include wood, crop residues, cattle dung, manure, sewage ⮚ The bio-mass is directly used as a fuel but the efficiency of ... air pollution ⮚ It is therefore more useful to convert the bio-mass into bio-gas or bio-fuels

Tidal Energy

Description : Tidal Energy

Last Answer : ⮚ Ocean tides are produced by gravitational forces of sun and moon, and contain enormous amount of energy. ⮚ The tidal energy can be harnesses by constructing tidal barrage

Salinity Problems

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Water logging

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Biological magnification

Description : Biological magnification

Last Answer : Many of the pesticides are not biodegradable and keep on accumulating in the food chain, this process is called as bio-magnification

Death of non-target organisms

Description : Death of non-target organisms

Last Answer : Many insecticides are broad spectrum poisons which not only kill the target species but also several non-target species which are useful to us

Creating resistance in pests and producing new pests

Description : Creating resistance in pests and producing new pests

Last Answer : Some individuals of the pest species usually survive even after pesticide spray The survivors give rise to highly resistant generations About 20 species of pests are now known which have become immune to all types of pesticides an are known as ―super pests‖

Eutrophication

Description : Eutrophication

Last Answer : Eutrophication means Over Nourishment Due to Eutrophication lakes get invaded by algal blooms; these algae grows very fast by rapidly using up the nutrients, they often are toxic and badly affect the food chain

Nitrate Pollution

Description : Nitrate Pollution

Last Answer : Nitrogenous fertilizers applied in the fields often leach deep into soil and ultimately contaminate the ground water The nitrates get concentrated in the water and when their concentration exceeds 25 mg/L, they become the cause of a serious health hazard called ―Blue Baby syndrome‖

Micronutrient Imbalance

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Last Answer : Most of the chemical fertilizers used in modern agriculture have nitrogen, phosphorus and potassium which are essential macronutrients Farmers use these indiscriminately to boost up crop growth.