Tonoplast is the membrane covering of

Options

A. vacuole
B. mitochondria
C. chloroplast
D. lysosome

Answer

### Step-by-Step Solution:

1. **Identify the Definition of Tonoplast**:
- Tonoplast is defined as a membrane that surrounds certain organelles within a cell.

2. **Determine the Organelle Covered by Tonoplast**:
- The primary organelle that is covered by Tonoplast is the vacuole.

3. **Characteristics of Vacuoles**:
- In plant cells, vacuoles are typically large and serve various functions, including storage and maintaining turgor pressure.

4. **Structure of Tonoplast**:
- Tonoplast is a single membrane structure, meaning it consists of only one lipid bilayer, which encapsulates the vacuole.

5. **Comparison with Other Organelles**:
- It is important to note that other organelles such as mitochondria, chloroplasts, and lysosomes have different types of membranes (e.g., double membranes for mitochondria and chloroplasts).

6. **Conclusion**:
- Therefore, the correct answer to the question "Tonoplast is the membrane covering of" is the vacuole.

### Final Answer:
Tonoplast is the membrane covering of the vacuole.

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