The process of nitrogen fixation by the bacterias present in the root nodule does not take place in the presence of

Molecular form of hydrogen.

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Elemental form of oxygen.

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Water.

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Elemental form of nitrogen.

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Solution

The correct option is B Elemental form of oxygen.
The bacteria of species Rhizobium is associated with the root nodules of the leguminous plants. The nitrogenase enzyme in this bacterium helps in the fixation of the atmospheric nitrogen to nitrates which can be used for the growth of the plants. This enzyme is inactivated in the presence of oxygen and nitrogen fixation does not occur. The leghemoglobin pigment in bacteria scavenges the oxygen which is used by this aerobic bacteria.
Thus, the correct answer is option B.

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

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(b) elemental form of oxygen
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(d) elemental form of nitrogen

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What do you understand by symbiotic nitrogen fixation? Describe the role of leghaemoglobin in nitrogen fixation. Outline the process of nitrogen fixation as it takes place in the bacteroid inhabiting a legume nodule.

Nitrogen fixation takes place in presence of oxygen.

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