In SDP, flowering is interrupted if

Options

A. dark condition is interrupted by white/ red light
B. dark condition is interrupted by far red light
C. dark condition is interrupted by red followed by far red light
D. in short day plant flowering can not be interrupted

Answer

**Step-by-Step Solution:**

1. **Understanding Short Day Plants (SDP):**
- Short day plants are those that require longer nights and shorter days to flower. They typically bloom when the duration of darkness exceeds a certain threshold, which usually occurs in the winter months.

2. **Identifying Conditions for Flowering:**
- For short day plants, flowering occurs when the night period is long enough. If the dark period is interrupted, it can affect their ability to flower.

3. **Analyzing the Options:**
- **Option 1:** Dark condition is interrupted by white or red light.
- Both white and red light can interrupt the dark period, leading to the inhibition of flowering in short day plants. This option is correct.

- **Option 2:** Dark condition is interrupted by far-red light.
- Far-red light does not inhibit flowering; in fact, it can promote flowering in short day plants. Thus, this option is incorrect.

- **Option 3:** Dark condition is interrupted by red followed by far-red light.
- The red light would inhibit flowering, but the subsequent far-red light may counteract this effect, allowing flowering to occur. Therefore, this option is also incorrect.

- **Option 4:** In short day plants, flowering cannot be interrupted.
- This statement is false because flowering can indeed be interrupted by light conditions.

4. **Conclusion:**
- The correct answer is that flowering in short day plants is interrupted if the dark condition is interrupted by white or red light.