A single unit membrane surrounds the organelle

Options

A. Nucleus
B. Mitochondrion
C. Lysosomes
D. Chloroplast

Answer

To solve the question "A single unit membrane surrounds the organelle," we need to analyze each of the given options: nucleus, mitochondria, lysosome, and chloroplast.

### Step-by-Step Solution:

1. **Analyze the Nucleus**:
- The nucleus is known to be a double membrane-bound organelle.
- It consists of an outer nuclear membrane and an inner nuclear membrane.
- Therefore, the nucleus does not fit the criteria of being surrounded by a single unit membrane.

**Conclusion**: The nucleus is not the correct answer.

2. **Analyze the Mitochondria**:
- Mitochondria are also double membrane-bound organelles.
- They have an outer membrane and an inner membrane, which encloses the mitochondrial matrix.
- Since mitochondria have two membranes, they do not meet the requirement of being surrounded by a single unit membrane.

**Conclusion**: Mitochondria are not the correct answer.

3. **Analyze the Lysosome**:
- Lysosomes are membrane-bound organelles that are surrounded by a single unit membrane.
- They contain hydrolytic enzymes that aid in digestion and are often referred to as "suicidal bags" due to their role in breaking down waste materials.
- Since lysosomes are surrounded by a single membrane, they fit the criteria of the question.

**Conclusion**: Lysosomes are the correct answer.

4. **Analyze the Chloroplast**:
- Chloroplasts are double membrane-bound organelles found in plant cells.
- They consist of an outer membrane and an inner membrane, and they are involved in photosynthesis.
- As chloroplasts have two membranes, they do not qualify as being surrounded by a single unit membrane.

**Conclusion**: Chloroplasts are not the correct answer.

### Final Answer:
The correct option is **C) Lysosome**, as it is the only organelle surrounded by a single unit membrane.

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