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Explain how plants respond to a light source, usually the Sun. What is occurring inside the plant, and what hormone is involved?
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Explain how plants respond to a light source, usually the Sun. What is occurring inside the plant, and what hormone is involved?

User RobotCharlie
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Plants also exhibit phototropism, or growing toward a light source. This response is controlled by a plant growth hormone called auxin. As shown in Figure below, auxin stimulate s cell s on the dark side of a plant to grow longer. This causes the plant to bend toward the light.

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User Antwann
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