Which of the following xylem elements lack lignified cell wall ?

Options

A. Vessels
B. Xylem parenchyma
C. Xylem fibres
D. Both (A) and (B)

Answer

To solve the question "Which of the following xylem elements lack lignified cell wall?", we need to analyze the different types of xylem elements and their characteristics.

### Step-by-Step Solution:

1. **Identify the Xylem Elements**: The main types of xylem elements include:
- Xylem vessels
- Xylem parenchyma
- Xylem fibers

2. **Examine Xylem Vessels**:
- Xylem vessels are long, hollow structures made of dead cells.
- They have lignified cell walls, which provide strength and support.
- **Conclusion**: Xylem vessels do NOT lack lignified cell walls.

3. **Examine Xylem Parenchyma**:
- Xylem parenchyma consists of living cells that are involved in storage and transport.
- Importantly, xylem parenchyma does NOT have lignified cell walls.
- **Conclusion**: Xylem parenchyma LACKS lignified cell walls.

4. **Examine Xylem Fibers**:
- Xylem fibers are specialized cells that provide mechanical support.
- They have thick, lignified cell walls.
- **Conclusion**: Xylem fibers do NOT lack lignified cell walls.

5. **Evaluate the Options**:
- The question asks for the xylem element that lacks lignified cell walls.
- From our analysis, only xylem parenchyma fits this criterion.

6. **Final Answer**:
- The correct answer is **Xylem Parenchyma** (Option 2).