The stimulus of photoperiodism is perceived by

Options

A. Leaves
B. Shoot apex
C. Lateral meristem
D. Flowers

Answer

To solve the question "The stimulus of photoperiodism is perceived by," we need to understand the concept of photoperiodism and identify the part of the plant responsible for perceiving light stimuli.

### Step-by-Step Solution:

1. **Define Photoperiodism**:
- Photoperiodism is the physiological reaction of organisms to the length of day or night. In plants, it influences processes such as flowering, growth, and development based on the duration of light exposure.

2. **Identify the Perception Mechanism**:
- The perception of light in plants is primarily done through specialized cells that can detect light changes. This is crucial for the plant's response to varying light conditions.

3. **Determine the Plant Structure Involved**:
- The leaves are the primary site where light is captured. They contain chlorophyll, which is essential for photosynthesis and also plays a role in sensing light.

4. **Evaluate Other Options**:
- **Shoot Apex**: While it is involved in growth, it does not primarily perceive light.
- **Lateral Meristem**: This area is responsible for growth in thickness but does not play a role in light perception.
- **Flowers**: They are the result of photoperiodism but do not perceive light themselves.

5. **Conclusion**:
- Based on the above analysis, the correct answer is that the stimulus of photoperiodism is perceived by the **leaves**.

### Final Answer:
The stimulus of photoperiodism is perceived by the **leaves**.