Which of the following statement about the conducting tissues 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 about the conducting tissues is true, we need to analyze the characteristics of the two main types of conducting tissues in plants: xylem vessels and tracheids.

### Step-by-Step Solution:

1. **Identify the Conducting Tissues**:
- The two main conducting tissues in the xylem are vessels and tracheids.

2. **Characteristics of Vessels**:
- Vessels are multicellular structures.
- They have a wide lumen (the inner space of the vessel).
- The end walls of vessels are either rounded or transverse.
- Vessels can be several centimeters in length.
- Their walls are less thickened compared to tracheids.

3. **Characteristics of Tracheids**:
- Tracheids are unicellular structures.
- They have a narrow lumen.
- The end walls of tracheids are oblique or tapering.
- Tracheids are smaller in size, typically only a fraction of a centimeter long.
- Their walls are more thickened compared to vessels.

4. **Evaluate the Options**:
- **Option 1**: "Vessels are multicellular and they have a wide lumen."
- This statement is true based on the characteristics outlined.
- **Option 2**: "Tracheids are multicellular."
- This statement is false; tracheids are unicellular.
- **Option 3**: "Vessels are unicellular."
- This statement is false; vessels are multicellular.
- **Option 4**: "Tracheids have a wide lumen."
- This statement is false; tracheids have a narrow lumen.

5. **Conclusion**:
- The only true statement about the conducting tissues is **Option 1**: "Vessels are multicellular and they have a wide lumen."

### Final Answer:
The correct answer is **Option 1**.