For nitrification:(i) acceptor type differs between Nitrosomonas and Nitrobacter;(ii) predominant carbon source is organic matter;(iii) predominant carbon source is inorganic carbon;(iv) ammonium is donor during ammonium-to-nitrite conversion. Select all correct options.
Correct answer: (A) (iii) and (iv) correct; (C) (i) incorrect and (iii) correct
Explanation
Conventional aerobic nitrifiers use oxygen as electron acceptor in both steps and inorganic carbon for biomass. Ammonium supplies electrons in ammonia oxidation; nitrite supplies them in nitrite oxidation. Therefore (i),(ii) are false and (iii),(iv) true. The correct listed combinations are **A, C**.
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