Tropisms: Name the curvature movement that causes plants to bend toward a light source. Full question: Plant bending toward the source of light occurs due to which directional growth response (movement of curvature)? Choose the correct option.

ConceptPhototropism is directional growth in response to light; auxin redistribution to the shaded side promotes elongation there, bending the organ toward light (positive phototropism in shoots).

ContrastGeotropism: gravity; hydrotropism: water gradients; thigmotropism: touch; chemitropism: chemical cues.

Final AnswerPhototropism.