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Gravitropism in plants determines root and shoot growth based on gravity and light stimuli.
Gravitropism is the plant growth response to gravity, where roots exhibit positive gravitropism by growing down into the soil, and shoots display negative gravitropism by growing upwards toward sunlight.
This response is controlled by a plant growth hormone called auxin. In roots, indole acetic acid inhibits cell elongation on the lower side, causing roots to grow downwards, while in shoots, it stimulates cell expansion in the upper side, facilitating upward growth.
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