The graviperception (geotropic response) of root is due to starch grains (statoliths) in

Options

A. cells of root cap
B. cells of root hairs
C. cells in root apex
D. cells in growing point

Answer

To solve the question regarding the graviperception (geotropic response) of roots being due to starch grains (statoliths), we will follow these steps:

### Step-by-Step Solution:

1. **Understanding Geotropism**:
- Roots exhibit positive geotropism, meaning they grow towards gravity, while stems exhibit negative geotropism, growing away from gravity.

2. **Identifying the Role of Statoliths**:
- Statoliths are specialized organelles that contain starch grains (amyloplasts) and act as gravity sensors in plants.

3. **Locating Statoliths in Roots**:
- Statoliths are primarily found in specific cells at the tips of roots, particularly in the root cap.

4. **Function of the Root Cap**:
- The root cap protects the delicate meristematic tissue behind it from soil abrasion and is involved in sensing gravity due to the presence of statoliths.

5. **Analyzing the Options**:
- The options provided are:
- A) Cells of root cap
- B) Cells of root hair
- C) Cells in root apex
- D) Cells in growing point
- Based on our understanding, the correct answer is option A, as statoliths are located in the cells of the root cap.

6. **Conclusion**:
- Therefore, the graviperception of roots is due to starch grains (statoliths) found in the cells of the root cap.

### Final Answer:
The graviperception (geotropic response) of roots is due to starch grains (statoliths) in the **cells of the root cap** (Option A).

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