In the nitrogen cycle, bacteria that convert ammonium ions into nitrate are called

Answer and explanation

Correct answer: A. nitrifying bacteria

Nitrifying bacteria oxidise ammonium to nitrite and then to nitrate.
Answer: nitrifying bacteria.
Why not the others: denitrifying bacteria: they convert nitrate to nitrogen gas. nitrogen-fixing bacteria: they convert nitrogen gas into ammonium compounds. decomposers only: they release ammonia from dead matter.

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