Photoperiodism

Question

A short-day plant will flower when the night length is:

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1. **Photoperiodism**: The response of plants to the relative lengths of day and night.
2. **Short-Day Plants (SDP)**: These plants are actually **Long-Night Plants**. They flower only when the period of darkness exceeds a certain 'critical length'.
3. **Flowering Condition**: The dark period must be **uninterrupted** and **longer than the critical night length**.
4. **Interruption**: If the long dark period is interrupted by even a brief flash of light, the short-day plant will not flower.
5. **Example**: Soybeans, chrysanthemums.

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Photoperiodism

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