Physiologic Function
phototropism Audio
pho·tot·ro·pism [ foh-to-truh-piz-uhm, foh-toh-troh-piz-uhm ]
Subclass of:
Tropism
Definitions related to phototropism:
  • The directional growth of organisms in response to light. In plants, aerial shoots usually grow towards light. The phototropic response is thought to be controlled by auxin (= AUXINS), a plant growth substance. (From Concise Dictionary of Biology, 1990)
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • The movement of an organism, or part of an organism, in response to a light stimulus, usually toward or away from it.
    Gene Ontology Dictionary
    Gene Ontology Consortium, 2021
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This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Some terms may have alternate or updated definitions not reflected in this set. The definitions on this page should not be considered complete or up to date.