Phenomena and Processes

Tropism

The directional growth of an organism in response to an external stimulus such as light, touch, or gravity. Growth towards the stimulus is a positive tropism; growth away from the stimulus is a negative tropism. (From Concise Dictionary of Biology, 1990)

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

The directional growth of an organism in response to an external stimulus such as light, touch, or gravity. Growth towards the stimulus is a positive tropism; growth away from the stimulus is a negative tropism. (From Concise Dictionary of Biology, 1990)

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Synonyms

1 entry terms
  • Tropisms

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Aspects Covered

6 allowable subheadings

Indexed with the subheadings drug effects, ethics, genetics, immunology, physiology, radiation effects.

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Indexing Annotation

distinguish -tropic from -trophic (nutritional)

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History Note

95

MeSH Hierarchy

Tree Numbers

  1. G07.345.249.845w
  2. G15.920w

AMA Style

References

  1. National Library of Medicine. Tropism. Medical Subject Headings (MeSH). 2026. Unique ID D018523. http://id.nlm.nih.gov/mesh/2026/D018523
  2. Tropism. In: Wikipedia. https://en.wikipedia.org/wiki/Tropism
  3. Tropism. In: Wikidata. https://www.wikidata.org/wiki/Q239762