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geotropism
[ jee-o-truh-piz-uhm ]
noun
- oriented growth with respect to the force of gravity.
geotropism
/ ˌdʒiːəʊˈtrɒpɪk; dʒɪˈɒtrəˌpɪzəm /
noun
- 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
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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Derived Forms
- ˌgeoˈtropically, adverb
- geotropic, adjective
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Word History and Origins
Origin of geotropism1
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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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