Information AboutTropism |
| CATEGORIES ABOUT TROPISM | |
| tropismtropism | |
| plant physiology | |
| ecology | |
| SHOPPER'S DELIGHT | |
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A tropism 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 nasties which are non-directional responses). The word tropism comes from the Greek ''tropos'' ("to turn"). 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 Plant s (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 SEE ALSO The tropism can also be classified like the following: phototropism; geotropism; and hydrotropsim |