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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

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Nitrogen fixation is done by nitrogen-fixing bacteria. these bacteria possess this property because of the presence of an enzyme called " Nitrogenase". Nitrogenase activity is dropped down in the presence of oxygen because of alterations in its structure and thus nitrogen fixation occurs anaerobically.

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