An enucleated plant cell is

Options

A. Epidermal cell
B. Companion cell
C. Xylem parenchyma
D. Sieve tube cell

Answer

To solve the question "An enucleated plant cell is," we need to understand what an enucleated cell is and identify which of the given options fits this description.

### Step-by-Step Solution:

1. **Understanding Enucleated Cells**:
- An enucleated cell is a cell that lacks a nucleus. In plants, certain specialized cells can lose their nuclei during their development.

2. **Analyzing the Options**:
- **A. Epidermal cells**: These cells form the outer layer of the plant and contain a nucleus. Therefore, they are not enucleated.
- **B. Companion cells**: These cells are associated with sieve tube elements in the phloem and contain a nucleus. Thus, they are also not enucleated.
- **C. Xylem parenchyma**: These cells are involved in storage and transport of nutrients and do have a nucleus. Hence, they are not enucleated.
- **D. Sieve tube cells**: These cells are part of the phloem and are responsible for the transport of sugars. They are unique because they lose their nuclei as they mature, making them enucleated.

3. **Conclusion**:
- Based on the analysis, the correct answer is **D. Sieve tube cells**, as they are the only enucleated cells among the options provided.

### Final Answer:
D. Sieve tube cells