Geotropism: Will plant roots turn toward the pull of gravity?  

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trophyhunter1 | College Teacher | (Level 1) Educator Emeritus

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The roots of plants grow toward the gravitational pull, however, stems grow in the opposite direction. If an experiment is done changing the orientation of the plant's roots by laying it on its side, the roots will eventually show a positive tropism in response to the pull of gravity. This behavior of plant roots and stems was observed by Charles Darwin.