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Which process is facilitated by nitrifying bacteria in the nitrogen cycle?

1. Conversion of ammonia into nitrite and further into nitrate.
2. Leghaemoglobin, a red pigment in legume root nodules, acts as an oxygen carrier during symbiotic nitrogen fixation.
3. Molybdenum, a trace element, is essential for nitrogen fixation as it forms part of the nitrate reductase enzyme.
4. Rhodosprillium is an anaerobic, free-living bacterium capable of photosynthesis under oxygen-free conditions.

Correct answer: Conversion of ammonia into nitrite and further into nitrate.

Solution

The correct answer is A because nitrifying bacteria, such as Nitrosomonas and Nitrobacter, are responsible for converting ammonia to nitrite and nitrite to nitrate during the nitrogen cycle.

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