The photoperiod in plants is perceived at

Options

A. meristem
B. flower
C. floral buds
D. leaves

Answer

To solve the question "The photoperiod in plants is perceived at," we need to understand the concept of photoperiodism and where in the plant this process occurs.

### Step-by-Step Solution:

1. **Define Photoperiodism**: Photoperiodism is the physiological reaction of organisms to the length of day or night. In plants, it refers to how they respond to the duration of light and darkness in order to regulate flowering and other developmental processes.

2. **Identify the Perception Site**: The question asks where the photoperiod is perceived in plants. Research and experiments have shown that the leaves are the primary site for perceiving photoperiodic signals.

3. **Review Experimental Evidence**: Historical experiments demonstrated that if a plant had all its leaves removed, it would not flower, even if the conditions were otherwise favorable. This indicates that leaves are crucial for sensing light duration.

4. **Evaluate the Options**: The options provided are:
- Maize
- Stem
- Flower
- Leaves

Based on the understanding that leaves are responsible for perceiving photoperiod, we can conclude that the correct answer is "leaves."

5. **Final Answer**: Therefore, the photoperiod in plants is perceived at the **leaves**.