____ are the vegetative parts of the plant that show photoperiodic perception.

Options

A. Roots
B. Stems
C. Leaves
D. Flowers

Answer

To solve the question "____ are the vegetative parts of the plant that show photoperiodic perception," we need to identify which part of the plant is responsible for perceiving changes in day length, which is crucial for regulating flowering and other developmental processes.

### Step-by-Step Solution:

1. **Understand Photoperiodism**:
- Photoperiodism is the physiological reaction of organisms to the length of day or night. In plants, it primarily affects flowering and other developmental processes.

2. **Identify Vegetative Parts of the Plant**:
- The main vegetative parts of a plant include roots, stems, and leaves. Each part has distinct functions.

3. **Evaluate Each Option**:
- **Roots**: Their primary function is to absorb water and nutrients from the soil and store food. They do not perceive photoperiod.
- **Stems**: They support leaves and transport water and nutrients. Stems also do not play a significant role in photoperiodic perception.
- **Leaves**: Leaves are crucial for photosynthesis and are known to be the primary site for photoperiodic perception in plants. They contain photoreceptors that detect light changes.
- **Flowers**: While flowers are involved in reproduction and respond to photoperiod, they are not considered vegetative parts.

4. **Conclusion**:
- Since leaves are the vegetative parts of the plant that show photoperiodic perception, the correct answer is **leaves**.

### Final Answer:
Leaves are the vegetative parts of the plant that show photoperiodic perception.