Question

I. Nitrogenase is only catalytic under anaerobic conditions

II. The energy for nitrogen fixation can be provided by respiration of the host cells

III. In nitrogen fixation, nitrogen is reduced by the addition of 3 successive pairs of hydrogen

IV. Within a nodule, O₂ leaves are kept low.

V. Many living organisms can utilize the nitrogen in the form of N_2, available abundantly in air.

• A. All are correct
• B. I, II, III, V are correct
• C. II, III, IV, V are correct
• D. Only V is false

Answer 1

Answer: (A)

All are correct