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Question

Which of the following can convert the nitrogen molecules present in air into nitrates and nitrites?
(a) a biological process of nitrogen-fixing bacteria present in the soil
(b) a biological process of carbon fixing factor present in the soil
(c) any of the industries manufacturing nitrogenous compounds

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Solution

(a) a biological process of nitrogen-fixing bacteria present in the soil

Nitrogen gas makes up 78% of our atmosphere and nitrogen is also a part of many molecules essential to life like proteins, nucleic acids (DNA and RNA) and some vitamins. Nitrogen is thus an essential nutrient for all life-forms. The nitrogen molecules present in air can be converted into nitrates and nitrites by a biological process of nitrogen-fixing bacteria present in the soil. The process of biological fixation of nitrogen is called as nitrogen-fixation.

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