_________are double membrane -bound, specialized cell organelles that are found only in plant cells

Options

A. Centrosomes
B. Plastids
C. Chromoplast
D. Leucoplast

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for a type of organelle that is double membrane-bound and found only in plant cells.

2. **Analyze the Options**: The options provided are:
- Centrosomes
- Plastids
- Chromoplast
- Leukoplast

3. **Evaluate Each Option**:
- **Centrosomes**: These are not found in plant cells; they are present in animal cells and play a role in cell division.
- **Plastids**: These are double membrane-bound organelles that are indeed found only in plant cells. They include:
- **Chloroplast**: Responsible for photosynthesis.
- **Chromoplast**: Provides color to plants.
- **Leucoplast**: Stores nutrients.
- **Chromoplast** and **Leucoplast**: While these are types of plastids, they are not the general term that encompasses all types of plastids.

4. **Conclusion**: The correct answer is **Plastids**, as they are the double membrane-bound organelles that are specifically found in plant cells.

**Final Answer**: Plastids

---