Orange-yellow colours of flowers and fruits are due to

Options

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

Answer

### Step-by-Step Solution

1. **Understand the Question**: The question asks about the reason for the orange-yellow colors found in flowers and fruits.

2. **Identify the Options**: The options given are:
- Chloroplasts
- Leucoplasts
- Alluroplasts
- Chromoplasts

3. **Analyze Each Option**:
- **Chloroplasts**: These are the green organelles in plant cells responsible for photosynthesis. They contain chlorophyll, which gives plants their green color.
- **Leucoplasts**: These are colorless organelles involved in the storage of starch, oils, and proteins. They do not contribute to color.
- **Alluroplasts**: This term is not commonly used in the context of plant pigments and is not a standard type of plastid.
- **Chromoplasts**: These are specialized plastids that contain pigments, including carotenoids and xanthophylls, which are responsible for the orange and yellow colors in flowers and fruits.

4. **Select the Correct Answer**: Based on the analysis, the correct answer is **Chromoplasts**. They contain the pigments that give flowers and fruits their orange-yellow colors.

5. **Conclusion**: The orange-yellow colors of flowers and fruits are due to chromoplasts, which contain pigments such as carotenoids and xanthophylls.