geotropism
[jee-o-truh-piz-uh m]
- oriented growth with respect to the force of gravity.
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Origin of geotropism
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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for geotropism
Historical Examples
Geotropism is a specific subject in the physiology of plants.
Thus I am now observing something about geotropism, and I had no idea a few weeks ago that this would have been necessary.
More Letters of Charles Darwin Volume IICharles Darwin
No phenomenon of tropic movement appears so inexplicable as that of geotropism.
Life Movements in Plants, Volume II, 1919Sir Jagadis Chunder Bose
The root is thus supposed to be characterised by "positive" and the shoot by "negative" geotropism.
Life Movements in Plants, Volume II, 1919Sir Jagadis Chunder Bose
Hence an agent which acts on the organ from outside, induces phototropic change earlier than variation in geotropism.
Life Movements in Plants, Volume II, 1919Sir Jagadis Chunder Bose
geotropism
- the response of a plant part to the stimulus of gravity. Plant stems, which grow upwards irrespective of the position in which they are placed, show negative geotropism
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for geotropism
Online Etymology Dictionary, © 2010 Douglas Harper
geotropism
[jē-ŏt′rə-pĭz′əm]
- The directional growth of an organism in response to gravity. Roots display positive geotropism when they grow downwards, while shoots display negative geotropism when they grow upwards. Also called gravitropism
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The American Heritage® Science Dictionary
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