In the root nodules of legumes, leghaemoglobin is important because it

Transports oxygen to the root nodule.

Acts as an oxygen scavenger.

Provides energy to the nitrogen fixing bacterium.

Acts as a catalyst in transamination.

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The root nodule bacterium is microaerobic in the sense that it requires oxygen but the high concentration of oxygen is detrimental to nitrogen-fixing enzyme system. Here leghaemoglobin proves beneficial, it absorbs or binds oxygen so that there is no free oxygen left in the nodule and then carries micro-amounts of oxygen to the nodule bacteroids. Thus the correct answer is option B.

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