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  • The process of nitrogen-fixation by bacteria does not take place in the presence of (a) molecular form of hydrogen (b) elemental form of oxygen (c) water (d) elemental form of nitrogen

 The process of nitrogen-fixation by bacteria does not take place in the presence of

(a) molecular form of hydrogen
(b) elemental form of oxygen
(c) water
(d) elemental form of nitrogen

Answers (1)

Nitrogen fixation is a process by which nitrogen (N_{2}) in the atmosphere is converted into ammonia (NH_{3}).  Biological nitrogen fixation (BNF) occurs when atmospheric nitrogen is converted to ammonia by an enzyme called nitrogenase.  Enzymes responsible for nitrogenase action are very susceptible to destruction by oxygen. 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 proteins.
Hence the correct option is B

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