Ammonia___(A)__`to`nitrite___(B)__`tp`nitrate What are (A) & (B) in the given process :-

Options

A. `{:(A,B),("Nitrosomonas", "Nitrococcus"):}`
B. `{:(A,B),("Nitrobacter", "Nitrococcus"):}`
C. `{:(A,B),("Nitrosomonas", "Nitrobacter"):}`
D. `{:(A,B),("Pseudomonas", "Nitrobacter"):}`

Answer

To solve the question regarding the conversion of ammonia to nitrite and then to nitrate, we need to identify the specific bacteria involved in these processes.

### Step-by-Step Solution:

1. **Understanding the Process**: The question describes a process involving ammonia, nitrite, and nitrate. This process is known as nitrification, which is a part of the nitrogen cycle.

2. **Identifying (A)**: The first step in nitrification is the conversion of ammonia (NH₃) to nitrite (NO₂⁻). This conversion is primarily carried out by a group of bacteria known as **Nitrosomonas**. Therefore, (A) is **Nitrosomonas**.

3. **Identifying (B)**: The second step involves the conversion of nitrite (NO₂⁻) to nitrate (NO₃⁻). This conversion is performed by another group of bacteria called **Nitrobacter**. Hence, (B) is **Nitrobacter**.

4. **Final Answer**:
- (A) = Nitrosomonas
- (B) = Nitrobacter

### Summary:
- Ammonia is converted to nitrite by **Nitrosomonas** (A).
- Nitrite is converted to nitrate by **Nitrobacter** (B).