Which of the following cells is/are unable to multiply on attaining maturity ?

Options

A. Erythocytes
B. Sieve tube cells
C. Nerve cells
D. All of these

Answer

To answer the question "Which of the following cells is/are unable to multiply on attaining maturity?", we will analyze each option provided:

### Step-by-Step Solution:

1. **Understanding the Question**:
- We need to identify which cells are unable to multiply once they reach maturity.

2. **Analyzing Option 1: Erythrocytes (Red Blood Cells)**:
- Erythrocytes are mature red blood cells that lack a nucleus.
- Since they do not have a nucleus, they cannot undergo cell division or replicate.
- **Conclusion**: Erythrocytes are unable to multiply on attaining maturity.

3. **Analyzing Option 2: Sieve Tube Cells**:
- Sieve tube cells are part of the phloem in plants and are responsible for transporting nutrients.
- These cells are living but also lack a nucleus.
- Without a nucleus, they cannot divide or multiply.
- **Conclusion**: Sieve tube cells are unable to multiply on attaining maturity.

4. **Analyzing Option 3: Nerve Cells (Neurons)**:
- Neurons are specialized cells that transmit nerve impulses.
- Once neurons mature, they generally do not divide or replicate.
- **Conclusion**: Nerve cells are unable to multiply on attaining maturity.

5. **Analyzing Option 4: All of These**:
- This option suggests that all the previous options (erythrocytes, sieve tube cells, and nerve cells) are unable to multiply on attaining maturity.
- Since we have established that all three types of cells do not multiply upon reaching maturity, this option is correct.

### Final Answer:
- The correct answer is **Option 4: All of these**.