Which of the following organelles does not have a double layer ?

Options

A. nuclei
B. lysosomes
C. Chloroplasts
D. mitochondria

Answer

To determine which organelle does not have a double layer, we can analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Organelles**: We need to examine the organelles mentioned in the options. The options are likely to include organelles such as the nucleus, lysosome, chloroplast, and mitochondria.

2. **Analyze the Nucleus**:
- The nucleus is surrounded by a nuclear membrane, which consists of two lipid bilayers (inner and outer membranes).
- Therefore, the nucleus has a double membrane structure.

3. **Analyze the Lysosome**:
- Lysosomes are membrane-bound organelles that contain digestive enzymes.
- They are surrounded by a single lipid bilayer.
- Thus, lysosomes do not have a double membrane.

4. **Analyze the Chloroplast**:
- Chloroplasts are involved in photosynthesis and are surrounded by two membranes (inner and outer).
- Therefore, chloroplasts have a double membrane structure.

5. **Analyze the Mitochondria**:
- Mitochondria are known as the powerhouses of the cell and are also surrounded by two membranes (inner and outer).
- Hence, mitochondria have a double membrane structure.

6. **Conclusion**:
- Based on the analysis, the only organelle that does not have a double layer is the lysosome.
- Therefore, the correct answer is **Option 2: Lysosome**.

### Final Answer:
The organelle that does not have a double layer is **Lysosome**.