Choose wrong one.

Options

A. `N_(2)` -fixation needs anaerobic condition
B. ATP, that is used in nitrogen fixation comes from respiration of host cells
C. Amides serves as protein precursor, key compound for nitrogen transport and storage.
D. Amides have low N-to C ratio

Answer

**Step-by-Step Solution:**

1. **Understanding Nitrogen Fixation**: Nitrogen fixation is a process where nitrogen gas (N₂) from the atmosphere is converted into ammonia (NH₃) by certain bacteria, such as Rhizobium. This process is essential for plants as they cannot utilize atmospheric nitrogen directly.

2. **Analyzing the Options**:
- **Option 1**: "Nitrogen fixation needs anaerobic condition."
- This statement is correct. Nitrogenase, the enzyme responsible for nitrogen fixation, is inactivated by oxygen. Therefore, an anaerobic environment is necessary for its activity.

- **Option 2**: "ATP that is used in nitrogen fixation comes from respiration of host cell."
- This statement is also correct. The energy required for nitrogen fixation is provided by ATP, which is generated through the respiration of the host plant cells.

- **Option 3**: "Emmates serve as protein precursor key compound for nitrogen transport and storage."
- This statement is correct. Emmates (or amino acids) are indeed precursors for proteins and play a crucial role in nitrogen transport and storage in plants.

- **Option 4**: "Emmates are low nitrogen to carbon ratio."
- This statement is incorrect. Emmates, which contain two amino groups, have a higher nitrogen content compared to normal amino acids, which contain only one amino group and one carboxyl group. Therefore, they have a higher nitrogen to carbon ratio.

3. **Conclusion**: The wrong statement among the options provided is option 4.

**Final Answer**: Option 4 is the incorrect statement.

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