In geotropism, what does gravity act as?
Directional stimulus
A tropism is a directional growth movement of a plant part in response to an external stimulus. In geotropism, the stimulus is gravity.
Gravity acts in a fixed direction, so roots grow downward towards it (positive geotropism) and shoots grow upward away from it (negative geotropism).
Gravity is a non-living external factor, so it is neither a biotic factor nor an internal factor.
Hence, the answer is Directional stimulus.
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