Which one of the following organisms has a role in converting ammonia into nitrites?

Step-by-step solution

Ammonia is converted into nitrate by nitrifying activities of bacteria, this process is called nitrification. Soil bacteria such as Nitrosomonas and Nitrosococcus convert ammonia to nitrite. N H 3 + 3 O 2 → 2 H N O 2 + 2 H 2 O