Which of the following is a short day plant

Options

A. Wheat
B. Barley
C. Larkspur
D. Dahlia/Xanthium.

Answer

To determine which of the following is a short day plant, we need to understand the concept of photoperiodism and the classification of plants based on their light requirements.

### Step-by-Step Solution:

1. **Understand Photoperiodism**:
- Photoperiodism is the response of plants to the relative lengths of light and dark periods. It plays a crucial role in flowering and growth.

2. **Classification of Plants**:
- Plants can be classified into three categories based on their light requirements:
- **Short Day Plants**: These plants require longer periods of darkness and shorter periods of light to flower. They typically bloom when the day length is shorter than a certain critical threshold.
- **Long Day Plants**: These plants require longer periods of light and shorter periods of darkness to flower. They bloom when the day length exceeds a certain critical threshold.
- **Day Neutral Plants**: These plants do not depend on the length of day or night to flower.

3. **Identify Examples of Short Day Plants**:
- Common examples of short day plants include:
- **Dahlia**
- **Xanthium**
- **Rice**
- **Chrysanthemum**
- **Soybean**

4. **Conclusion**:
- From the examples provided, you can identify which of the listed options is a short day plant. For instance, if you have options like Dahlia, Chrysanthemum, or Soybean, any of these would be correct answers.