Which of the following would be in insignificant amount in xylem sap

Options

A. Water
B. Nitrate
C. Phosphate
D. Sugar

Answer

To determine which substance would be present in insignificant amounts in xylem sap, we need to understand the composition and function of xylem.

### Step-by-Step Solution:

1. **Understanding Xylem**:
- Xylem is a type of vascular tissue in plants responsible for the conduction of water and dissolved minerals from the roots to the rest of the plant.

2. **Components of Xylem Sap**:
- Xylem sap primarily consists of water and minerals. The common minerals found in xylem sap include nitrates and phosphates.

3. **Analyzing the Options**:
- We need to evaluate the options provided in the question to identify which one is present in insignificant amounts in xylem sap.

4. **Evaluating Each Option**:
- **Water**: This is the main component of xylem sap, so it is present in large amounts. (Not the answer)
- **Nitrate**: This is a mineral that is commonly found in xylem sap in significant amounts. (Not the answer)
- **Phosphate**: Like nitrates, phosphates are also present in significant amounts in xylem sap. (Not the answer)
- **Sugar**: Sugars are primarily transported through phloem, not xylem. Therefore, they are present in insignificant amounts in xylem sap.

5. **Conclusion**:
- Based on the analysis, the substance that would be present in insignificant amounts in xylem sap is **sugar**.

### Final Answer:
The correct answer is **sugar** (Option 4).

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