Leghaemoglobin helps in

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(B) The root nodules of leguminous plants contain symbiotic nitrogen-fixing bacteria called $Rhizobium$. Root nodules are small,irregular outgrowths o

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protecting nitrogenase from $O_2$

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(B) The root nodules of leguminous plants contain symbiotic nitrogen-fixing bacteria called $Rhizobium$. Root nodules are small,irregular outgrowths on the roots which appear pinkish internally due to the presence of a pigment called leghaemoglobin. This pigment is structurally related to the blood pigment haemoglobin. Leghaemoglobin acts as an oxygen scavenger,which creates an anaerobic environment by binding to oxygen. This is crucial because the nitrogen-fixing enzyme,nitrogenase,is highly sensitive to molecular oxygen $(O_2)$ and is inactivated in its presence. Therefore,leghaemoglobin protects nitrogenase from $O_2$ to ensure efficient nitrogen fixation.

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