Multiple choice

What do you call the process of conversion of ammonia to nitrite by microbes?

  1. Nitrification

  2. Nitrogen fixation

  3. Eutrophication

  4. Denitrification
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A Correct answer
Explanation

Nitrification is the two-step process where ammonia (NH3) is first converted to nitrite (NO2-) by bacteria like Nitrosomonas, then nitrite is converted to nitrate (NO3-) by Nitrobacter. The specific conversion mentioned (ammonia to nitrite) is the first step of nitrification. Nitrogen fixation converts N2 to NH3, denitrification converts nitrates back to N2, and eutrophication is nutrient pollution causing algal blooms.

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