Besides providing pink colour to the root nodules , leghaemoglobin performs the function of

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protecting leakage of fixed nitrogen to the soil atmosphere

transporting nitrogen to host cells

protecting enzyme nitrogenase from free oxygen

protecting bacteroids from the enzymes of host cell

answer is A.

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Detailed Solution

The enzyme nitrogenase is highly sensitive to the molecular oxygen, it requires anaerobic conditions, the nodules contain pink colour pigment called as leg hemoglobin which protect these enzymes from high levels of Oxygen and carries control rate of oxygen thus it is called as oxygen scavenger

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