An example for enucleated cell in plants is :

Options

A. parenchyma cell
B. meristematic cell
C. tracheid
D. a mature sieve tube cell

Explanation

To solve the question "An example for enucleated cell in plants is:", we need to identify which of the given options represents a plant cell that lacks a nucleus.

### Step-by-Step Solution:

1. **Understand the Concept of Enucleated Cells**:
- Enucleated cells are cells that do not contain a nucleus. In plants, certain cells lose their nuclei as they mature.

2. **Analyze the Options Provided**:
- **Option A: Parenchyma Cell**:
- Parenchyma cells are living cells with a nucleus and are involved in storage, photosynthesis, and tissue repair.
- **Conclusion**: Not an enucleated cell.

- **Option B: Meristematic Cell**:
- Meristematic cells are actively dividing cells found in growing regions of the plant. They have a nucleus and are responsible for growth.
- **Conclusion**: Not an enucleated cell.

- **Option C: Tracheids**:
- Tracheids are water-conducting cells in the xylem. They are elongated cells that do lose their nucleus at maturity but are not the best example of an enucleated cell.
- **Conclusion**: While they lose their nucleus, they are not the primary example of enucleated cells in plants.

- **Option D: Mature Sieve Tube Cell**:
- Sieve tube cells are part of the phloem and are responsible for transporting nutrients. At maturity, these cells lose their nucleus, making them enucleated.
- **Conclusion**: This is the correct answer as it is a clear example of an enucleated cell.

3. **Final Answer**:
- The correct answer is **Option D: Mature Sieve Tube Cell**.