Which of the following plant cells show totipotency ?

Options

A. Cork cells , meristem , spores
B. Meristem, zygote , spores
C. Spores, zygote, xylem vessels
D. Sieve tube , zygote , spores

Answer

To determine which of the following plant cells show totipotency, we need to understand what totipotency means and analyze the options provided.

### Step-by-Step Solution:

1. **Understanding Totipotency**:
- Totipotency refers to the ability of a single cell to divide and develop into a complete organism. In plants, this means that certain cells can regenerate an entire plant from just one cell or tissue.

2. **Identifying Totipotent Cells**:
- **Meristematic Cells**: These are actively dividing cells found in the growing regions of plants (like tips of roots and shoots). They have the ability to differentiate into various types of cells and can regenerate the whole plant. Thus, they exhibit totipotency.
- **Zygote**: The zygote is formed after fertilization and is the first cell of a new organism. It can undergo multiple divisions and eventually develop into an entire plant, showing totipotency.
- **Spores**: Spores are reproductive cells that can develop into a new organism under suitable conditions. They also exhibit totipotency.

3. **Analyzing Other Options**:
- **Xylem Vessels**: These are specialized cells that transport water and nutrients. They are dead at maturity and do not have the ability to divide, hence they do not show totipotency.
- **Cork Cells**: These are also dead cells that form the protective outer layer of stems and roots. Like xylem vessels, they cannot divide and thus do not exhibit totipotency.
- **Sieve Tube Elements**: These are part of the phloem and are responsible for transporting sugars. They lack a nucleus and have lost the ability to divide, so they do not show totipotency.

4. **Conclusion**:
- The cells that show totipotency among the given options are **meristematic cells, zygote, and spores**. Therefore, the correct answer is the option that includes these three types of cells.

### Final Answer:
The plant cells that show totipotency are **meristematic cells, zygote, and spores**.