Main water-conducting element of xylem in homoxylous plants is
(a) Trachea
(b) Vessel
(c) Tracheid
(d) Xylem parenchyma

Options

A. Trachea
B. Vessel
C. Tracheid
D. Xylem parenchyma

Answer

To solve the question regarding the main water-conducting element of xylem in homoxylous plants, let's analyze the options provided:

1. **Understanding the Question**: The question asks for the main water-conducting element of xylem in homoxylous plants. Homoxylous plants are characterized by having a uniform structure in their xylem.

2. **Evaluating the Options**:
- **Option (a) Trachea**: Trachea are indeed part of the xylem and are known for their role in water conduction. They are tubular structures that facilitate the movement of water.
- **Option (b) Vessel**: Vessels are also water-conducting elements in xylem, but they are not the main element in homoxylous plants. They are elongated structures but are secondary to trachea in this context.
- **Option (c) Tracheid**: Tracheids are another type of water-conducting cell, but they are not the primary element in homoxylous plants. They are more common in gymnosperms and are less efficient in water conduction compared to vessels.
- **Option (d) Xylem parenchyma**: Xylem parenchyma cells are involved in storage and do not primarily conduct water.

3. **Conclusion**: After evaluating all the options, the main water-conducting element of xylem in homoxylous plants is **(a) Trachea**.

### Final Answer:
The main water-conducting element of xylem in homoxylous plants is **(a) Trachea**.