gravitropism
noun
gra·vit·ro·pism
| \ grə-ˈvi-trə-ˌpi-zəm
\
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Definition of gravitropism
: a tropism (as of plant roots or shoots) in which gravity is the stimulus : geotropism
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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