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Answer: 4. Leaves

Key idea: Photoperiod is sensed by the leaves.

Leaves perceive the light/dark duration and produce a flowering stimulus (florigen), which moves to the shoot apex and changes it from vegetative to floral. The shoot apex responds but does not perceive; experiments covering leaves prevent flowering even if the apex is exposed.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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