gravitropism
Americannoun
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Botany. Also geotropism. the directional pattern of growth that a plant experiences in response to gravity, as with a typical plant when the roots grow downward (positive gravitropism) and the stems grow upward (negative gravitropism).
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Biology. a similar pattern of orientation common among species of fungi and single-celled organisms.
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Example Sentences
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Apical dominance, seed germination, gravitropism, and resistance to freezing are all positively influenced by hormones.
From Textbooks ● Jun. 9, 2022
Growth of the shoot apical tip upward is called negative gravitropism, whereas growth of the roots downward is called positive gravitropism.
From Textbooks ● Jun. 9, 2022
Without gravitropism, roots would grow upward but seedlings would not grow upward toward the surface.
From Textbooks ● Jun. 9, 2022
The mechanism that mediates gravitropism is reasonably well understood.
From Textbooks ● Jun. 9, 2022
Other hypotheses—involving the entire cell in the gravitropism effect—have been proposed to explain why some mutants that lack amyloplasts may still exhibit a weak gravitropic response.
From Textbooks ● Jun. 9, 2022
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
