Eli5: How do plants move toward the light? How do they sense it and also move toward it in response?

Question

Eli5: How do plants move toward the light? How do they sense it and also move toward it in response?

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Answer 1

Plants growing toward light is called phototropism.

Plants have molecules that act when they detect light to encourage hormone changes in the plant.

These hormones, called Auxin, encourage the plant cells to change and grow toward the light source.