expriement to show root of a plant is positively geotropism
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High concentration of auxin inhibits the cell elongation in roots. Auxin accumulates on the lower side in a horizontally placed. Therefore, the root moves downward. Roots are much more sensitive to auxin than the stems. Ethylene is synthesized when auxin accumulates in root. It inhibits the root growth.
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sorry this is just an explanation but not an experiment
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