In strong light, chloroplasts are arranged along the lateral walls of palisade cells. The condition is called

Options

A. Parastrophe
B. Epistrophe
C. Apostrophe
D. Positive heliotropism.

Answer

To answer the question, "In strong light, chloroplasts are arranged along the lateral walls of palisade cells. The condition is called," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Chloroplast Movement**:
- Chloroplasts are organelles in plant cells that conduct photosynthesis. They can move in response to light conditions, which is known as phototaxis.

2. **Identifying Light Conditions**:
- In different light conditions, chloroplasts exhibit different arrangements:
- **In darkness**: Chloroplasts are randomly arranged.
- **In weak light**: Chloroplasts are positioned on the upper surface of palisade cells.
- **In strong light**: Chloroplasts are arranged along the lateral walls of palisade cells.

3. **Defining the Terms**:
- **Parastroph**: This term refers to the arrangement of chloroplasts along the lateral walls of palisade cells in strong light.
- **Apistroph**: This term refers to the arrangement of chloroplasts on the upper surface of palisade cells in weak light.
- **Apostroph**: This term refers to the random arrangement of chloroplasts in darkness.
- **Positive Heliotropism**: This term generally refers to the growth movement of plants towards light, not specifically the arrangement of chloroplasts.

4. **Conclusion**:
- Based on the definitions and the conditions described, the correct answer to the question is **Parastroph**.

### Final Answer:
The condition in which chloroplasts are arranged along the lateral walls of palisade cells in strong light is called **Parastroph**.

---