Which of correct ?
(a) Tracheids are unicellular with wide lumen
(b) Vessels are multicellular with wide lumen
(c) Tracheids are unicellular with narrow lumen
(d) Vessels are multicellular with narrow lumen

Options

A. Tracheids are unicellular with wide lume
B. Vessels are multicellular with wide lumen
C. Trecheids are unicellular with narrow lumen
D. Vessels are multicellular with narrow lumen

Answer

To determine which of the statements regarding tracheids and vessels is correct, let's analyze each option step by step.

1. **Understanding Tracheids:**
- Tracheids are a type of water-conducting cell found in the xylem of vascular plants.
- They are unicellular, meaning each tracheid is a single cell.
- Tracheids have a narrow lumen (the central cavity through which water flows), which is essential for their function in water transport.

2. **Understanding Vessels:**
- Vessels are also found in the xylem and are made up of multiple cells called vessel elements stacked on top of each other.
- Vessels have a wide lumen, allowing for efficient water transport.

Now, let's evaluate each option:

(a) **Tracheids are unicellular with wide lumen.**
- This statement is incorrect. Tracheids are unicellular, but they have a narrow lumen.

(b) **Vessels are multicellular with wide lumen.**
- This statement is correct. Vessels are indeed multicellular and have a wide lumen.

(c) **Tracheids are unicellular with narrow lumen.**
- This statement is also correct. Tracheids are unicellular and have a narrow lumen.

(d) **Vessels are multicellular with narrow lumen.**
- This statement is incorrect. Vessels are multicellular, but they have a wide lumen.

**Conclusion:**
The correct statements are:
- (b) Vessels are multicellular with wide lumen.
- (c) Tracheids are unicellular with narrow lumen.