Plastid with carotenoids only are

Options

A. Leucoplasts
B. Chromoplasts
C. Chloroplasts
D. All

Answer

### Step-by-Step Solution:

1. **Understanding Plastids**: Plastids are double membrane-bound organelles found only in plant cells. They are essential for various functions in plants.

2. **Types of Plastids**: There are three main types of plastids:
- **Chloroplasts**: These contain chlorophyll, the green pigment that helps in photosynthesis by trapping light energy.
- **Chromoplasts**: These contain colored pigments, primarily carotenoids, which give fruits and vegetables their vibrant colors.
- **Leucoplasts**: These are non-pigmented plastids primarily involved in the storage of food.

3. **Identifying the Plastid with Carotenoids**: The question specifically asks for the plastid that contains carotenoids only.
- **Chloroplasts** contain chlorophyll, not carotenoids.
- **Leucoplasts** do not contain pigments at all.
- **Chromoplasts** are the plastids that contain carotenoids.

4. **Conclusion**: Since chromoplasts are the only plastids that contain carotenoids, the correct answer to the question is **chromoplast**.

### Final Answer:
**Chromoplasts** are the plastids that contain carotenoids only.

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