Preferred Label : tropism;

MeSH definition : 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);

MeSH synonym : tropisms;

MeSH annotation : distinguish -tropic from -trophic (nutritional);

Wikipedia link : https://en.wikipedia.org/wiki/Tropism;

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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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