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 statement is true regarding vessels and tracheids, we need to analyze each option based on the characteristics of these structures in the xylem.

### Step-by-Step Solution:

1. **Understanding Vessels**:
- Vessels are part of the xylem and are responsible for the transportation of water.
- They are **multicellular** structures.
- Vessels have a **wide lumen** (the inner space through which water flows).
- They have **perforated walls**, allowing for efficient water transport.

2. **Understanding Tracheids**:
- Tracheids are also part of the xylem and play a role in water transport.
- They are **unicellular** structures (made up of single cells).
- Tracheids have a **narrow lumen** compared to vessels.
- They have tapering ends and are lignified, providing structural support.

3. **Analyzing Each Option**:
- **Option 1**: "Vessels are multicellular and with wide lumen" - This statement is **true**.
- **Option 2**: "Tracheids are multicellular and with narrow lumen" - This statement is **false** (tracheids are unicellular).
- **Option 3**: "Vessels are unicellular and with wide lumen" - This statement is **false** (vessels are multicellular).
- **Option 4**: "Tracheids are unicellular and with wide lumen" - This statement is **false** (tracheids have a narrow lumen).

4. **Conclusion**:
- The only true statement is **Option 1**: "Vessels are multicellular and with wide lumen".

### Final Answer:
**Option 1: Vessels are multicellular and with wide lumen** is the true statement.