Choose odd one w.r.t the presence of nucleus.

Options

A. Mature Sieve tube cell
B. Companion cell
C. Mesophyll cell
D. Parenchymatous cell

Answer

To solve the question of identifying the odd one out with respect to the presence of a nucleus, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understand the Question**: We need to identify which of the given options does not have a nucleus (is enucleated).

2. **Analyze Option 1: Mature Sieve Tubes**:
- Mature sieve tubes are specialized cells in plants that are involved in the transport of nutrients.
- They are known to be enucleated, meaning they do not have a nucleus. Instead, they rely on companion cells, which do have a nucleus, to perform necessary functions.
- **Conclusion**: This option is enucleated.

3. **Analyze Option 2: Mesophyll Cells**:
- Mesophyll cells are located in the leaves and are crucial for photosynthesis.
- These cells contain a nucleus, which is essential for their metabolic activities.
- **Conclusion**: This option has a nucleus.

4. **Analyze Option 3: Parenchyma Cells**:
- Parenchyma cells are a type of plant cell that is involved in storage, photosynthesis, and tissue repair.
- They also contain a nucleus, which is important for their functions.
- **Conclusion**: This option has a nucleus.

5. **Final Decision**:
- After analyzing all options, we find that:
- Mature sieve tubes (Option 1) are enucleated.
- Mesophyll cells (Option 2) have a nucleus.
- Parenchyma cells (Option 3) have a nucleus.
- Thus, the odd one out, which is enucleated, is **Option 1: Mature Sieve Tubes**.