Which of the following is made up of dead cells

Options

A. Xylem parenchyma
B. Collenchyma
C. Phellem
D. Phloem

Answer

To solve the question "Which of the following is made up of dead cells?" we will analyze each option provided: xylem parenchyma, collenchyma, phallum, and phloem.

### Step-by-Step Solution:

1. **Understand the Components**:
- We have four options to evaluate: xylem parenchyma, collenchyma, phallum, and phloem.

2. **Evaluate Xylem Parenchyma**:
- Xylem parenchyma is a type of tissue in the xylem. It is composed of parenchyma cells, which are living cells.
- **Conclusion**: Xylem parenchyma is made up of living cells.

3. **Evaluate Collenchyma**:
- Collenchyma is a tissue made up of elongated living cells with unevenly thickened primary walls.
- It provides support and flexibility to the plant.
- **Conclusion**: Collenchyma is also made up of living cells.

4. **Evaluate Phallum**:
- Phallum (or cork) is a tissue found in the outer bark of trees. It is composed of dead cells and serves as a protective layer.
- **Conclusion**: Phallum is made up of dead cells.

5. **Evaluate Phloem**:
- Phloem is responsible for transporting food and other organic materials. It is composed of living cells, including sieve tubes and companion cells.
- **Conclusion**: Phloem is made up of living cells.

6. **Final Conclusion**:
- Among the options, only phallum is made up of dead cells. Therefore, the correct answer is **phallum**.