Find the odd one w.r.t nitrifiying bacteria:

Options

A. Nitrococus
B. Nitrobacter
C. Nitrosomonas
D. Chlorobium

Answer

To solve the question of finding the odd one with respect to nitrifying bacteria, we can follow these steps:

### Step 1: Understand Nitrifying Bacteria
Nitrifying bacteria are microorganisms that play a crucial role in the nitrogen cycle by converting ammonia into nitrites and then nitrites into nitrates. This process is known as nitrification.

**Hint:** Remember that nitrifying bacteria are specifically involved in the conversion of ammonia to nitrites and then to nitrates.

### Step 2: Identify the Nitrifying Bacteria
The common nitrifying bacteria include:
- **Nitrosomonas:** Converts ammonia (NH₃) into nitrite (NO₂⁻).
- **Nitrobacter:** Converts nitrite (NO₂⁻) into nitrate (NO₃⁻).
- **Nitrococcus:** Another bacterium that can oxidize ammonia to nitrite.

**Hint:** Focus on the bacteria that are involved in the nitrification process.

### Step 3: Analyze the Given Options
The options provided are:
1. Nitrococcus
2. Nitrobacter
3. Nitrosomonas
4. Chlorobium

Among these, Nitrococcus, Nitrobacter, and Nitrosomonas are all nitrifying bacteria.

**Hint:** Compare each option to see if it fits the definition of nitrifying bacteria.

### Step 4: Identify the Odd One Out
Chlorobium is not a nitrifying bacterium. Instead, it is a genus of green sulfur bacteria that performs photosynthesis and is involved in sulfur oxidation, not nitrogen oxidation.

**Hint:** Look for the option that does not participate in the nitrification process.

### Conclusion
The odd one out with respect to nitrifying bacteria is **Chlorobium**.

**Final Answer:** Chlorobium