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Sunflowers are popularly known for tracking the sun, a diurnal motion known as heliotropism. However, only the young plants exhibit this behavior. Sunflowers that have opened will generally remain in a fixed position facing east. The heliotropism observed in young plants is controlled by a circadian rhythm, meaning it becomes a biological rhythm coordinated with a 24-hour period. Because of this, if a young plant is turned to face the opposite direction, it will continue the old tracking pattern for a few days until it corrects itself.
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