Find the odd one (w.r.t. nutrition)

Options

A. Hydrogenomonas
B. Nitrosomonas
C. Xanthomonas
D. Methanomonas

Answer

To find the odd one out with respect to nutrition, we will analyze each of the given options based on their nutritional modes.

### Step-by-Step Solution:

1. **Identify the first option: Hydrogenomonas**
- Hydrogenomonas are short rod-shaped soil bacteria.
- They are autotrophic, meaning they can produce their own food using inorganic substances.

2. **Identify the second option: Nitrosomonas**
- Nitrosomonas are also bacteria.
- They are nitrifying bacteria and are autotrophic as well, meaning they also produce their own food.

3. **Identify the third option: Xanthomonas**
- Xanthomonas is a genus of bacteria known to cause plant diseases.
- Unlike the previous two, Xanthomonas is not autotrophic; it is heterotrophic, meaning it relies on organic compounds for nutrition.

4. **Identify the fourth option: Methanomonas**
- Methanomonas are also bacteria.
- They are autotrophic, similar to Hydrogenomonas and Nitrosomonas, as they can produce their own food.

5. **Conclusion:**
- The odd one out is **Xanthomonas** because it is heterotrophic, while the other three (Hydrogenomonas, Nitrosomonas, and Methanomonas) are autotrophic.

### Final Answer:
The odd one out with respect to nutrition is **Xanthomonas**.