Photoperiodism
A short-day plant will flower when the night length is:
Select the correct option:
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About This Question
- Subject
- biology
- Chapter
- plant physiology
- Topic
- photoperiodism
- Difficulty
- Hard
- Year
- 2025
Solution
Correct Answer:
Longer than critical
- Photoperiodism: The response of plants to the relative lengths of day and night.
- Short-Day Plants (SDP): These plants are actually Long-Night Plants. They flower only when the period of darkness exceeds a certain 'critical length'.
- Flowering Condition: The dark period must be uninterrupted and longer than the critical night length.
- Interruption: If the long dark period is interrupted by even a brief flash of light, the short-day plant will not flower.
- Example: Soybeans, chrysanthemums.
This hard difficulty biology question is from the chapter plant physiology, covering the topic of photoperiodism. It appeared in the 2025 exam.
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