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.

Difficulty: Easy

Phototropism
Geotropism (gravitropism)
Hydrotropism
Thigmotropism
Chemitropism

Correct Answer: Phototropism

Explanation:

Concept
Phototropism 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).

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

Final Answer
Phototropism.

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