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)

Year introduced: 1995

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Tree Number(s): G07.345.249.845, G15.920

MeSH Unique ID: D018523

Entry Terms:

• Tropisms

See Also:

• Viral Tropism

All MeSH Categories
Phenomena and Processes Category
Physiological Phenomena
Growth and Development
Growth
Tropism
Gravitropism
Phototropism

All MeSH Categories
Phenomena and Processes Category
Plant Physiological Phenomena
Tropism
Gravitropism
Phototropism