The xylem vessels are relatively more in number in

Options

A. Autumn wood
B. Late wood
C. Primary xylem
D. Spring wood

Answer

### Step-by-Step Solution:

1. **Understanding Xylem Vessels**:
- Xylem vessels are responsible for the transport of water and minerals from the roots to the rest of the plant. They are a crucial part of the plant's vascular system.

2. **Identifying the Types of Wood**:
- There are different types of wood based on the season they are formed:
- **Spring Wood**: Formed during the spring season, characterized by larger vessels.
- **Summer Wood**: Formed during the summer season, typically has smaller vessels.
- **Primary Xylem**: The xylem that is formed during the initial growth of the plant.
- **Atatumon Wood**: This term seems to be a typographical error or a less common term; it is not standard in botanical terminology.

3. **Comparing Xylem Vessel Numbers**:
- During the spring, the xylem vessels are larger and more numerous due to the rapid growth conditions (more water and nutrients available).
- In contrast, during the summer, the growth slows down, leading to the formation of summer wood, which has fewer and smaller vessels.

4. **Conclusion**:
- Since the question asks where xylem vessels are relatively more in number, the spring wood is the correct answer. This is because the conditions during spring promote the formation of a greater number of xylem vessels compared to other types of wood.

5. **Final Answer**:
- The xylem vessels are relatively more in number in **spring wood**.