What is the fate of `NH_(4)^(+)` in plant

Options

A. It is deprotonated
B. It is reprotonated
C. It is used to synthesise amino acid
D. It is used in photorespiration

Answer

### Step-by-Step Solution:

1. **Understanding the Ammonium Ion (NH₄⁺)**:
- The ammonium ion (NH₄⁺) is a form of nitrogen that plants can absorb from the soil. However, it is important to note that NH₄⁺ can be toxic to plants if accumulated in large amounts.

2. **Toxicity and Utilization**:
- Due to its toxicity, plants cannot store NH₄⁺. Therefore, they must quickly utilize it to prevent harmful effects.

3. **Conversion to Amino Acids**:
- The primary fate of NH₄⁺ in plants is its conversion into amino acids. This is crucial for plant growth and development as amino acids are the building blocks of proteins.

4. **Processes Involved**:
- There are two main biochemical processes through which NH₄⁺ is converted into amino acids:
- **Reductive Amination**: This process involves the incorporation of NH₄⁺ into organic compounds to form amino acids.
- **Transamination**: This process involves the transfer of an amino group from one amino acid to a keto acid, facilitating the synthesis of new amino acids.

5. **Conclusion**:
- Therefore, the fate of NH₄⁺ in plants is primarily to be utilized in the synthesis of amino acids, making it an essential component for various metabolic processes.

### Final Answer:
The fate of NH₄⁺ in plants is that it is used to synthesize amino acids.

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