For nitrogen fixation,the useful pigment is

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(D) Leghaemoglobin is a red,oxygen-binding,iron-containing protein pigment present in the root nodules of leguminous plants.It is essential for nitrog

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Leghaemoglobin

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(D) Leghaemoglobin is a red,oxygen-binding,iron-containing protein pigment present in the root nodules of leguminous plants.It is essential for nitrogen fixation because it acts as an oxygen scavenger (or oxygen buffer).It maintains a low concentration of free oxygen within the nodule,which is necessary to protect the enzyme $Nitrogenase$ from oxidative damage,as $Nitrogenase$ is highly sensitive to oxygen.

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