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Oxygen is harmful for

(a) ferns
(b) nitrogen fixing bacteria
(c) chara
(d) mango tree

Answers (1)

best_answer

Answer: B

Solution.

Biological nitrogen fixation (BNF) occurs when atmospheric nitrogen is converted to ammonia by a Nitrogenase enzyme. Nitrogenases are rapidly degraded by oxygen. For this reason, many bacteria cease production of the enzyme in the presence of oxygen. Many nitrogen-fixing organisms exist only in  anaerobic conditions, respiring to draw down oxygen levels, or binding the oxygen with a protein such as leghemoglobin.
Hence, the correct option of this question is option B

    

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