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Auxin stimulates cell elongation. It accumulates on shaded side which results in more elongation of cells towards shaded side of the plant. This causes bending of the plant towards source of light.

1. Auxin stimulates cell elongation.
2. Auxin accumulates on shaded side.
3. Auxin causes bending towards light.
4. Auxin promotes phototropism.

Correct answer: Auxin promotes phototropism.

Solution

The passage explains that auxin distribution leads to unequal cell elongation, which makes the plant bend toward light. That light-directed growth response is called phototropism, so the best summary is that auxin promotes phototropism.

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