The site which receives the phototropic stimulus is

Options

A. Shoot apex (tip)
B. Root apex (tip)
C. Meristematic regions
D. Leaves.

Answer

To solve the question "The site which receives the phototropic stimulus is," we can follow these steps:

### Step-by-Step Solution:

1. **Understand Phototropism**: Phototropism is the growth response of a plant to light. Plants tend to grow towards light sources, which is crucial for maximizing photosynthesis.

2. **Identify the Perceptive Region**: The area of the plant that receives the stimulus is known as the perceptive region. This region is responsible for detecting environmental signals.

3. **Consider the Options**: The options provided are:
- Shoot apex
- Root apex
- Meristematic regions
- Leaves

4. **Analyze Each Option**:
- **Shoot Apex**: This is the tip of the shoot where growth occurs and is known to respond to light.
- **Root Apex**: This is the tip of the root, which primarily responds to gravity (gravitropism) rather than light.
- **Meristematic Regions**: These are regions of active cell division but are not specifically responsive to light.
- **Leaves**: While leaves are involved in photosynthesis, they do not primarily receive the phototropic stimulus.

5. **Determine the Correct Answer**: Since the shoot apex is the part of the plant that detects light and initiates growth towards it, the correct answer is the shoot apex.

### Final Answer:
The site which receives the phototropic stimulus is the **shoot apex**.

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