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

Examples

• Sunflowers demonstrate heliotropism by turning their heads to follow the sun across the sky.
• The plant’s heliotropism caused it to bend toward the window.
• Scientists studied the heliotropism of various flowering plants in the greenhouse.
• Heliotropism helps plants maximize their exposure to sunlight for photosynthesis.
• The seedlings showed clear heliotropism as they grew toward the light source.
• Many flowers exhibit heliotropism during their early growth stages.