gravitropism

noun

gra·vit·ro·pism grə-ˈvi-trə-ˌpi-zəm

: 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

Examples of gravitropism in a Sentence

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In most trees, their sensitivity to the Earth's gravitational pull, called gravitropism, counteracts their will to bend toward light, keeping them upright. —

Nathaniel Scharping, Discover Magazine, 6 June 2017