Which of the following statements about nitrogen \( \mathrm{P} \) f...

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Which of the following statements about nitrogen
\( \mathrm{P} \) fixation is correct?

W
(i) Nitrogenase is only catalytic under anaerobic conditions.
(ii) The energy for nitrogen fixation can be provided by either photosynthesis or respiration.
(iii) In nitrogen fixation, nitrogen is reduced by the addition of three successive pairs of hydrogen atoms.
(iv) Most nitrogen fixing microbes are aerobic.
(1) (i) and (ii) only
(2) (ii) and (iv) only
(3) (i), (ii) and (iii) only
(4) All of the above
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