An analysis of the xylem exudates shows that much of nitrogen is carried in

Options

A. organic form as amides
B. inorganic ions
C. organic form as organic acids
D. ammoniun salts

Explanation

To answer the question regarding the form in which nitrogen is carried in xylem exudates, we can break down the solution into several steps:

### Step-by-Step Solution:

1. **Understanding Xylem Function**:
- Xylem is primarily responsible for the transport of water and dissolved minerals from the roots to the rest of the plant. It plays a crucial role in nutrient transport, including nitrogen.

**Hint**: Remember that xylem is mainly involved in transporting water and minerals, while phloem is responsible for transporting food.

2. **Nitrogen Transport Forms**:
- Nitrogen can be transported in various forms within plants. The main forms include inorganic ions (like nitrate and ammonium), organic acids, and organic compounds such as amides.

**Hint**: Think about the different chemical forms nitrogen can take in plants and how they might be utilized.

3. **Focus on Amides**:
- In the context of xylem exudates, nitrogen is primarily transported in the form of organic compounds, specifically as amides. Common examples of amides in plants include glutamine and asparagine.

**Hint**: Recall that amides serve as a storage form of nitrogen in plants, which is essential for various metabolic processes.

4. **Exclusion of Other Forms**:
- While nitrogen can also be present as inorganic ions and organic acids, the question specifies the analysis of xylem exudates, which indicates that the predominant form of nitrogen in this context is organic, specifically as amides.

**Hint**: Consider why certain forms of nitrogen would be more prevalent in xylem exudates compared to others.

5. **Conclusion**:
- Based on the analysis, the correct answer is that much of the nitrogen in xylem exudates is carried in the form of amides.

**Hint**: Summarize your findings to reinforce the conclusion that amides are the main form of nitrogen transport in xylem.

### Final Answer:
Much of the nitrogen in xylem exudates is carried in the form of amides.