1. the growth or movement of a plant or organism in response to light
Usage: biology

Examples

• The sunflower’s phototropism causes it to turn toward the sun throughout the day.
• Plants exhibit positive phototropism by growing toward light sources.
• The seedlings showed clear phototropism as they bent toward the window.
• Phototropism helps plants maximize their exposure to sunlight for photosynthesis.
• Scientists studied the phototropism of various plant species in controlled conditions.
• The vine’s phototropism guided it to climb toward the brightest area of the garden.