Question

Question 9
The nitrogen molecules present in air can be converted into nitrates and nitrites by

(a) a biological process of nitrogen fixing bacteria present in soil
(b) a biological process of carbon fixing factor present in soil
(c) any of the industries manufacturing nitrogenous compounds
(d) the plants used as cereal crops in field

Answer 1

(a) a biological process of nitrogen fixing bacteria present in 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 soil. The process of bio fixation of nitrogen is called as nitrogen fixation.