What causes a green plant to bend towards light as it grows?

Because green plants need light to carry on photosynthesis.

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Because green plants are phototropic.

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Light stimulates plant cell on the lighted side to grow faster.

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Auxin accumulates on the shaded side.

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Solution

The correct option is D Auxin accumulates on the shaded side.
According to most widely accepted view for phototropism, the phytohormone auxin accumulates on the shady side of stem and stimulates growth. This causes the plant stem to grow towards the light (positive phototropism).
Thus, the correct answer is option D.

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