The functional xylem of dicot tree is
(a) Transpiration
(b) Guttation
(c) Bleeding
(d) Gaseous exchange

Options

A. (a) Transpiration
B. (b) Guttation
C. (c) Bleeding
D. (d) Gaseous exchange

Answer

To solve the question regarding the functional xylem of a dicot tree, we need to analyze the options provided and understand the role of xylem in plants.

### Step-by-Step Solution:

1. **Understanding Xylem Function**:
- The primary function of xylem in plants, including dicot trees, is to transport water and minerals from the roots to various parts of the plant.

2. **Analyzing the Options**:
- **(a) Transpiration**: This is the process of water movement through a plant and its evaporation from aerial parts, primarily leaves. While transpiration is related to xylem function, it is not the direct function of xylem itself.
- **(b) Guttation**: This refers to the exudation of water droplets from the leaves of some plants, typically occurring at night. This process is not directly related to xylem function.
- **(c) Bleeding**: This is the process where sap or fluid oozes out from a cut part of a plant. It is not a function of xylem.
- **(d) Gaseous exchange**: This involves the exchange of oxygen and carbon dioxide, primarily occurring in the stomata of leaves, which is not a function of xylem.

3. **Identifying the Correct Answer**:
- Given that the question asks for the functional aspect of xylem, the closest option is **(a) Transpiration**. However, it is important to note that transpiration is a result of xylem function (water transport), rather than a direct function of xylem itself.

4. **Conclusion**:
- The answer to the question is **(a) Transpiration**, as it is the most relevant option concerning the role of xylem in the movement of water within the plant.

### Final Answer:
- The functional xylem of a dicot tree is **(a) Transpiration**.