How plants can regulate processes like flowering based on day length (photoperiod).
Missed the previous lesson? Watch here: https://www.khanacademy.org/science/biology/plant-responses-to-light-cues/v/phototropism
Plant biology on Khan Academy: Plants may seem less interactive than animals. But they actually have many ways of responding to their environment, changing their growth or physiology to make the best use of available resources. Learn more about plants and their response to environmental cues.
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