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Phycomyces, a fungus, exhibiting phototropism. A tropism (from Greek ÏÏÏÏÎ¿Ï, tropos, a turning) is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus.
For example, if someone touches your arm, you generally turn to react. In plants, the response to a stimulus is known as a tropism. This plant movement toward or away from a stimulus can come in many forms. Before we look at a few, let's better understand the word tropism. Like many words in science, tropism comes from a Greek word. Tropos means 'to turn'. Therefore, a tropism is a turn towards or away from a stimulus. When the movement is towards the stimulus, it is called positive tropism. Likewise, when the movement is away from the stimulus, it is called negative tropism.