Bacteria involved in two-step conversion ammonia into nitrate are

Azotobacter and Nitrosomonas

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Pseudomonas and Nitrobacter

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Azotobacter and Achromobacter

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Nitrosomonas and Nitrobacter

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Solution

The correct option is D Nitrosomonas and Nitrobacter
Nitrification is a process of conversion of ammonium ions to nitrites and nitrites to nitrates. It is a two-step process. The bacteria that carry out this process are called as nitrifying bacteria. Nitrosomonas, Nitrosospira, Nitrosococcus convert ammonia into nitrites. Nitrobacter, Nitrospina, Nitrococcus convert nitrites into nitrates.
Thus, the correct answer is 'Nitrosomonas and Nitrobacter.'

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