choose odd one w.r.t the role of mycobiont in lichen?

Options

A. Forms body structure and covering
B. Helps in anchorage
C. Fixes nitrogen
D. absorbs water and minerals

Answer

To solve the question regarding the odd one out with respect to the role of mycobiont in lichen, we will analyze the roles of mycobiont and identify which option does not fit.

### Step-by-Step Solution:

1. **Understanding Lichens**: Lichens are symbiotic associations between fungi (mycobiont) and algae (phycobiont). The mycobiont is the fungal component, while the phycobiont is the algal component.

2. **Roles of Mycobiont**:
- **Provides Body Structure**: The mycobiont forms the main body structure of the lichen, giving it shape and stability.
- **Anchorage**: The mycobiont helps the lichen anchor to various substrates, allowing it to grow in different environments.
- **Absorption of Water and Minerals**: The mycobiont absorbs water and essential minerals from the environment, which are crucial for the survival of both the fungal and algal components.

3. **Identifying the Odd One Out**:
- **Option 1**: Forms body structure and covering - This is a correct role of mycobiont.
- **Option 2**: Helps in anchorage - This is also a correct role of mycobiont.
- **Option 3**: Fixes nitrogen - This is incorrect. Nitrogen fixation is typically carried out by certain bacteria, not by mycobionts.
- **Option 4**: Absorbs water and minerals - This is a correct role of mycobiont.

4. **Conclusion**: Based on the analysis, the odd one out is **Option 3: Fixes nitrogen**, as this is not a role of the mycobiont in lichens.

### Final Answer:
**Option 3: Fixes nitrogen** is the odd one out with respect to the role of mycobiont in lichen.