A bacterium that converts NO2 to NO3 is:
Correct answer: D. Nitrobacter
- A. Rhizobium
- B. Bacillus
- C. Nitrosomonas
- D. Nitrobacter
Explanation
Nitrobacter is the correct answer because it is involved in the second step of nitrification, where it converts nitrite (NO2) to nitrate (NO3). This is an essential step in the nitrogen cycle, making nitrogen available to plants in a more accessible form. Rhizobium is involved in nitrogen fixation, Bacillus is known for endospore production, and Nitrosomonas converts ammonia to nitrite, not nitrite to nitrate.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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