Chloroplasts are aligned with their flat surface, parallel to the tangential walls of cells when

Options

A. Moderate incident light comes
B. Diffusion light comes
C. Plant is kept in strong light
D. When intermittent strong and diffused light is given

Answer

To solve the question regarding the alignment of chloroplasts with their flat surface parallel to the tangential walls of cells, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Chloroplasts**: Chloroplasts are organelles found in plant cells that are responsible for photosynthesis. They contain chlorophyll, which captures light energy.

2. **Chloroplast Orientation**: The question asks about the orientation of chloroplasts when they align their flat surfaces parallel to the tangential walls of cells. This alignment is crucial for maximizing light absorption.

3. **Light Conditions**: We need to analyze the different light conditions provided in the options:
- **Option A**: Moderate incident light
- **Option B**: Diffused light
- **Option C**: Strong light
- **Option D**: Intermittent strong and diffused light

4. **Effect of Light on Chloroplasts**:
- When chloroplasts are exposed to moderate incident light, they can optimize their position to absorb the maximum amount of light without the risk of damage from excessive light intensity.
- In strong light, chloroplasts may orient differently to avoid photo-oxidation, which can occur at high light intensities.

5. **Conclusion**: Based on the understanding that chloroplasts align parallel to the tangential walls of cells under moderate incident light to maximize light absorption while minimizing potential damage, the correct answer is:
- **Correct Answer**: Moderate incident light (Option A).