Which of the following statement is true?

Options

A. vessels are multicellular and with wide lumen
B. tracheids are multicellular and with narrow lumen
C. vessels are unicellular and with narrow lumen
D. tracheids are unicellular and with wide lumen.

Answer

To determine which of the statements about xylem components is true, let's analyze each statement step by step:

1. **Statement Analysis**:
- **Statement 1**: "Vessels are multicellular with wide lumen."
- **Analysis**: Vessels are indeed involved in the transport of water and minerals, but they are not strictly multicellular. They can be formed from multiple cells, but they function as a single unit. The lumen of vessels is wide, making this part of the statement true. However, since vessels can be unicellular or multicellular, this statement is not entirely accurate.
- **Conclusion**: This statement is **false**.

2. **Statement 2**: "Tracheids are multicellular with narrow lumen."
- **Analysis**: Tracheids are specialized cells in xylem that help in the transport of water. However, tracheids are unicellular, not multicellular, and they do have a narrow lumen. Therefore, the description of tracheids as multicellular makes this statement incorrect.
- **Conclusion**: This statement is **false**.

3. **Statement 3**: "Vessels are unicellular with narrow lumen."
- **Analysis**: While vessels have a wide lumen, they can be composed of multiple cells (vessel elements) that connect to form a continuous tube. Therefore, stating that vessels are unicellular and have a narrow lumen is incorrect.
- **Conclusion**: This statement is **false**.

4. **Statement 4**: "Tracheids are unicellular with wide lumen."
- **Analysis**: Tracheids are indeed unicellular, but they have a narrow lumen, not a wide one. This statement incorrectly describes the lumen of tracheids.
- **Conclusion**: This statement is **false**.

After analyzing all the statements, we find that none of the statements provided are true.

**Final Answer**: All statements are false.