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Nitrification (conversion of NH4+ to NO3⁻) is carried out by:
ANitrosomonas + Nitrobacter (chemoautotrophs)
BRhizobium (the symbiotic N-fixer in nodules)
CPseudomonas (a denitrifier mainly anaerobic)
DAzotobacter (the free-living N-fixer aerobic)
Answer & Solution
Correct answer: A. Nitrosomonas + Nitrobacter (chemoautotrophs)
Nitrification: 2-step process. Nitrosomonas (or Nitrococcus) converts NH4+ → NO2⁻. Then Nitrobacter converts NO2⁻ → NO3⁻. Both are chemoautotrophs (use energy from oxidation).
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