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geotropism

[ jee-o-truh-piz-uhm ]

noun

, Biology.
  1. oriented growth with respect to the force of gravity.


geotropism

/ ˌdʒiːəʊˈtrɒpɪk; dʒɪˈɒtrəˌpɪzəm /

noun

  1. 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
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


geotropism

/ jē-ŏtrə-pĭz′əm /

  1. 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.
  2. Also called gravitropism


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Derived Forms

  • geotropic, adjective
  • ˌgeoˈtropically, adverb
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Word History and Origins

Origin of geotropism1

First recorded in 1870–75; geo- + -tropism
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Example Sentences

Thus I am now observing something about geotropism, and I had no idea a few weeks ago that this would have been necessary.

No phenomenon of tropic movement appears so inexplicable as that of geotropism.

The root is thus supposed to be characterised by "positive" and the shoot by "negative" geotropism.

Hence an agent which acts on the organ from outside, induces phototropic change earlier than variation in geotropism.

Further tests will be given later, to distinguish the phenomenon of Thermonasty from that of Thermo-geotropism.

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geotropicGe-Pano-Carib