All given statements are correct w.r.t fate of ammonia, except

Options

A. Glutamine and asparagine are two most important amides in plants.
B. ` alpha ` - Ketoglutaric acid provides carbon skeleton for the process and reductive amination process
C. Amides and transported through sieve tubes
D. Glutamic acid is the main amino acid that provides ` NH_2` group during transamination process.

Answer

To solve the question regarding the fate of ammonia and identify the incorrect statement, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks us to identify the incorrect statement regarding the fate of ammonia in plants. We need to evaluate each provided statement to find the one that is not correct.

2. **Evaluating the First Statement**:
- The first statement mentions that glutamine and asparagine are the two most important amides in plants.
- This statement is correct because both glutamine and asparagine play crucial roles in nitrogen metabolism and are indeed significant amides in plants.

3. **Evaluating the Second Statement**:
- The second statement claims that alpha-ketoglutarate acid provides a carbon skeleton for the reductive amination process.
- This statement is also correct. Alpha-ketoglutarate is involved in the synthesis of amino acids, including glutamate, through the reductive amination process.

4. **Evaluating the Third Statement**:
- The third statement states that amides are transported through sieve tubes.
- This statement is incorrect. While amino acids (which include amides) are transported in plants, they are primarily transported through the phloem, specifically via sieve tubes. However, the transport of amides is more accurately associated with the xylem for certain processes, making this statement misleading.

5. **Evaluating the Fourth Statement**:
- The fourth statement asserts that glutamic acid is the main amino acid that provides the amino group (NH2) during the transamination process.
- This statement is correct. Glutamic acid is indeed a key amino acid that donates amino groups during transamination reactions.

6. **Conclusion**:
- After evaluating all statements, we find that the third statement regarding the transport of amides through sieve tubes is incorrect. Therefore, the answer to the question is that the incorrect statement is the one about amides being transported through sieve tubes.

### Final Answer:
The incorrect statement regarding the fate of ammonia is: **"Amides are transported through sieve tubes."**

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