A long day plant with critical day length of 14 hrs will flower under which of the following treatments?

Options

A. 7 hrs light-2 hrs darkness-3 hrs light-5 hrs darkness-7 hrs light
B. 5 hrs light-9 hrs darkness-a hrs light-2 hrs darkness
C. 10 hrs darkness-14 hrs light
D. 6 hrs light-6 hrs darkness-7 .5 hrs light- 4. 5 hrs darkness

Answer

To solve the question regarding a long day plant (LDP) with a critical day length of 14 hours and under which treatments it will flower, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Long Day Plants (LDP)**:
- Long day plants are those that require a longer photoperiod (day length) than their critical day length to initiate flowering. In this case, the critical day length is 14 hours.

2. **Identify the Conditions for Flowering**:
- For a long day plant with a critical day length of 14 hours, it will flower when the day length exceeds 14 hours. This means that any treatment that provides a photoperiod longer than 14 hours will promote flowering.

3. **Consider the Effects of Light and Dark Periods**:
- If a long day plant is exposed to a photoperiod longer than 14 hours, it will flower. Conversely, if the photoperiod is less than 14 hours, it will not flower.
- Additionally, if the dark period (scotoperiod) is interrupted by a flash of light, it may still flower as long as the total light period exceeds the critical length.

4. **Evaluate Possible Treatments**:
- Treatments that provide continuous light for more than 14 hours or treatments that include a long photoperiod followed by a dark period will support flowering in long day plants.

5. **Conclusion**:
- Therefore, a long day plant with a critical day length of 14 hours will flower under treatments that ensure a photoperiod longer than 14 hours.

### Final Answer:
A long day plant with a critical day length of 14 hours will flower under treatments that provide a photoperiod longer than 14 hours.

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