In root nodules of legumes, leghaemoglobin is important because it

transports oxygen to the root nodule

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acts as an oxygen scavenger

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provides energy to the nitrogen fixing bacterium

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acts as a catalyst in transamination

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Solution

The correct option is B acts as an oxygen scavenger
The root nodules of leguminous plants are pinkish due to the presence of pigment legheamoglobin. The cells of root nodules contain irregular polyhedral bacteria called bacteroids. Legheamoglobin is located bacteroids and surrounding host membrane. Legheamoglobin is an oxygen scavenger and protect the nitrogen fixing enzyme nitrogenase

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