A single unit membrane organelle is :-

Options

A. Ribosomes
B. Mitochondria
C. Chloroplast
D. Lysosomes

Answer

To determine which organelle is a single unit membrane organelle from the given options, we will analyze each option based on their membrane structure.

### Step-by-Step Solution:

1. **Understand the Types of Membrane Structures**:
- Organelles can be classified based on the number of membranes they have: single membrane or double membrane.

2. **Analyze the Options**:
- **Ribosomes**: These are not membrane-bound organelles. They are complexes of RNA and proteins and do not have any membranes.
- **Mitochondria**: These are double membrane organelles. They have an outer and an inner membrane.
- **Chloroplasts**: These are also double membrane organelles, similar to mitochondria, with an outer and inner membrane.
- **Lysosomes**: These are single membrane-bound organelles that contain digestive enzymes.

3. **Identify the Single Unit Membrane Organelle**:
- Among the options, lysosomes are the only organelles that are surrounded by a single membrane.

4. **Conclusion**:
- Therefore, the answer to the question "A single unit membrane organelle is:" is **lysosomes**.

### Final Answer:
**Lysosomes**

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