Multiple choice

The function of leghemoglobin in root nodules in rizobium legume 'symbiosis' is to

  1. protect nitrogenase in nodule bacterium

  2. transport of CO2 to nodule bacterium

  3. give purple colour to nodule bacterium

  4. give N2 to nodule bacterium
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A Correct answer
Explanation

Leghemoglobin binds oxygen with very high affinity, maintaining extremely low free oxygen concentration in root nodules. This protects oxygen-sensitive nitrogenase enzyme from being inactivated by O2. It does not transport CO2, provide color, or supply N2 to the bacterium.

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