allery**Photoperiodism** refers to:
AResponse of plants to gravity
BResponse of plants to **day length** (light duration) — affecting flowering
CResponse to soil temperature
DResponse to water stress
Answer & Solution
Correct answer: B. Response of plants to **day length** (light duration) — affecting flowering
**Photoperiodism:** plants flower in response to the relative duration of light and dark (day length). Garner & Allard (1920).
**Three classes:** short-day plants (e.g. tobacco), long-day plants (e.g. spinach), day-neutral (e.g. tomato).
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