Multiple choice

Which of the following pairs of bacteria is involved in two step conversion of NH3 into nitrate?

  1. Azotobacter and Nitrosomonas

  2. Nitrosomonas and Nitrobacter

  3. Azotobacter and Achromobacter

  4. Pseudomonas and Nitobacter

  5. -
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B Correct answer
Explanation

The conversion of ammonia to nitrate is performed primarily by soil-living bacteria and other nitrifying bacteria. In the primary stage of nitrification, the oxidation of ammonium is performed by bacteria (such as the Nitrosomonas species) which converts ammonia to nitrites. Other bacterial species (such as Nitrobacter) are responsible for the oxidation of the nitrites into nitrates.

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