The automatic turning or growth of an organism, especially a plant, toward or away from sunlight as a response to light direction.
From Greek 'helios' (sun), 'tropos' (turning), and '-ism' (condition or practice). This biological term emerged in the 19th century as botanists observed plant movements.
Heliotropism is basically plants showing off—they literally follow the sun throughout the day to optimize photosynthesis, and this movement is so precise that it's helped scientists understand how plants 'see' light.
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