Which of the following are covered by a single membrane?

Options

A. Mitochondria
B. Vacuole
C. Lysosome
D. Plastid

Explanation

To determine which of the following cell organelles are covered by a single membrane, we can analyze each option provided:

1. **Identify the Options**: The options given are:
- Mitochondria
- Vacuole
- Lysosome
- Plastid

2. **Understand Membrane Structure**:
- Some organelles are surrounded by a single membrane, while others are surrounded by a double membrane.
- A double membrane consists of an outer and an inner membrane, while a single membrane has only one layer.

3. **Analyze Each Organelle**:
- **Mitochondria**: This organelle is surrounded by a double membrane. It has an outer membrane and an inner membrane that is folded into structures called cristae.
- **Vacuole**: Vacuoles are typically surrounded by a single membrane. They are responsible for storing substances such as cell sap.
- **Lysosome**: Lysosomes are also surrounded by a single membrane. They contain digestive enzymes that help break down waste materials and cellular debris.
- **Plastid**: Plastids, such as chloroplasts, are surrounded by a double membrane. They are involved in photosynthesis and contain pigments.

4. **Conclusion**: Based on the analysis:
- The organelles that are covered by a single membrane are **Vacuole** and **Lysosome**.

5. **Final Answer**: Therefore, the correct answer is **Vacuole and Lysosome**.