How oxygen is harmful to nitrogen fixation?

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Solution

Effect of oxygen on nitrogen fixation:
The enzyme nitrogenase is oxygen-sensitive.
The presence of free oxygen in the cytoplasm of nodule cells may limit nitrogen-fixing in the nodule.
Oxygen degrades nitrogenases very quickly.
Some of the nitrogen fixers act in anaerobic condition to curtail the level of oxygen or allow the oxygen to combine with leghemoglobin.

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