The function of leghemoglobin in the root nodules of legumes is

Oxygen removal

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Inhibition of nitrogenase activity

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Expression of nif gene

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Nodule differentiation

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Solution

The correct option is A
Oxygen removal

In plants colonised by Rhizobium , the presence of oxygen in the root nodules would reduce the activity of the oxygen-sensitive nitrogenase - an enzyme responsible for the fixation of atmospheric nitrogen. Leghemoglobin buffers the concentration of free oxygen in the cytoplasm of infected plant cells to ensure the proper function of root nodules.

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