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. **Identify the Options**: The options given are:
- Option 1: Mature sieve tube cell
- Option 2: Companion cell
- Option 3: Mesophyll cell
- Option 4: Parenchyma cell

2. **Analyze Option 1: Mature Sieve Tube Cell**:
- Mature sieve tube cells are specialized cells in plants that are involved in the transport of nutrients.
- These cells are known to be enucleated, meaning they do not contain a nucleus.
- They rely on companion cells for their metabolic functions because they lack a nucleus and ribosomes.

3. **Analyze Option 2: Companion Cell**:
- Companion cells are associated with sieve tube cells and are responsible for providing them with necessary proteins and ATP.
- Unlike sieve tube cells, companion cells do contain a nucleus.

4. **Analyze Option 3: Mesophyll Cell**:
- Mesophyll cells are found in the leaves of plants and are involved in photosynthesis.
- These cells have a nucleus, which is essential for their function.

5. **Analyze Option 4: Parenchyma Cell**:
- Parenchyma cells are a type of simple permanent tissue in plants that serve various functions, including storage.
- These cells also contain a nucleus.

6. **Conclusion**:
- After analyzing all the options, we find that the mature sieve tube cell is the only cell type that does not contain a nucleus.
- Therefore, the odd one out with respect to the presence of a nucleus is **Option 1: Mature Sieve Tube Cell**.

### Final Answer:
The odd one out with respect to the presence of a nucleus is **Option 1: Mature Sieve Tube Cell**.

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