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Anonymous
Tropism: An involuntary orienting response; positive or negative reaction to a stimulus source. An example would be the involuntary movement of a plant towards sunlight.
Wiki User
A sunflower exhibits heliotropism by following the sun's movement to maximize sunlight absorption. It also displays phototropism by growing toward light sources for optimal photosynthesis. Lastly, sunflowers can adjust their leaf angle throughout the day to capture more sunlight.