Leghaemoglobin takes part in

Energy release

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Stimulating growth of Rhizobium

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_{2}

absorption

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Protecting nitrogenase

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Supply of oxygen

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Solution

The correct option is D Protecting nitrogenase
The pink color, typical of healthy and effective nodules, is due to the presence of a protein called leghemoglobin. This special protein contains Iron (Fe) and molybdenum (Mo) and is responsible for binding oxygen. This provides sufficient oxygen for the metabolic functions of the bacteroids but prevents the accumulation of free oxygen that would destroy the activity of nitrogenase.
So, the correct answer is option D.

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