gravitropism
noun
gra·vit·ro·pism
grə-ˈvi-trə-ˌpi-zəm
: a tropism of a plant part in which gravity is the stimulus : geotropism
root gravitropism
No matter what the orientation of a seed for instance, the roots will always grow down to the soil. This has a special name, gravitropism, and is movement in response to the force of gravity …—
Jeanette Mackay
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Merriam-Webster unabridged




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