AskDefine | Define tropism

Dictionary Definition

tropism n : an involuntary orienting response; positive or negative reaction to a stimulus source

User Contributed Dictionary



  1. the turning of an organism in response to a stimulus, either towards or away from the stimulus

Derived terms

Extensive Definition

A tropism (from Greek, tropos, to turn) is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus. In tropisms, this response is dependent on the direction of the stimulus (as opposed to nastic movements which are non-directional responses). Viruses and other pathogens also affect what is called "host tropism" or "cell tropism" in which case tropism refers to the way in which different viruses/pathogens have evolved to preferentially target specific host species, or specific cell types within those species. The word tropism comes from the Greek trope ("to turn" or "to change"). Tropisms are usually named for the stimulus involved (for example, a phototropism is a reaction to light) and may be either positive (towards the stimulus) or negative (away from the stimulus).
Tropisms are typically associated with plants (although not necessarily restricted to them). Where an organism is capable of directed physical movement (motility), movement or activity in response to a specific stimulus is more likely to be regarded by behaviorists as a taxis (directional response) or a kinesis (non-directional response).
In English, the word tropism is used in sometimes derisive way to indicate an action done without cognitive thought: However, "tropism" in this sense has a proper, although non-scientific, meaning as an innate tendency, natural inclination, or propensity to act in a certain manner.

Types of tropisms

tropism in German: Pflanzenbewegung
tropism in Estonian: Tropism
tropism in Spanish: Tropismo
tropism in French: Tropisme
tropism in Italian: Tropismo
tropism in Lithuanian: Tropizmas
tropism in Dutch: Nastie
tropism in Japanese: 屈性
tropism in Polish: Tropizm
tropism in Portuguese: Tropismo
tropism in Russian: Тропность
tropism in Chinese: 向性

Synonyms, Antonyms and Related Words

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