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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» 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


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