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tropism (GO:0009606)
The movement of an organism, or part of an organism, in response to an external source of stimulus, usually toward or away from it.
Specific
chemotropism (GO:0043577)
gravitropism (GO:0009630)
hydrotropism (GO:0010274)
phototropism (GO:0009638)
thigmotropism (GO:0009652)
General
response to external stimulus (GO:0009605)
References
gene ontology: GO:0009606