tropism

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tropism

 [tro´pizm]
a growth response in a nonmotile organism elicited by an external stimulus, and either toward the stimulus (positive tropism) or away from it (negative tropism); used as a word element combined with a stem that indicates the nature of the stimulus (e.g., phototropism) or the material or entity for which an organism or substance shows a special affinity (e.g., neurotropism). See also taxis.

tro·pism

, positive tropismnegative tropism (trō'pizm),
The phenomenon, observed in living organisms, of moving toward (positive tropism) or away from (negative tropism) a focus of light, heat, or other stimulus; usually applied to the movement of a portion of the organism as opposed to taxis, the movement of an entire organism.
[G. tropē, a turning]

tropism

(trō′pĭz′əm)
n.
The turning or bending movement of an organism or a part of an organism in a particular direction in response to an external stimulus such as light or gravity.

tro′pic, tro·pis′tic adj.
tro·pis′ti·cal·ly adv.

tro·pism

(trō'pizm)
The phenomenon, observed in living organisms, of moving toward (positive tropism) or away from (negaive tropism) a focus of light, heat, or other stimulus; usually applied to the movement of a portion of the organism as opposed to taxis, the movement of an entire organism.
[G. tropē, a turning]

tropism

An automatic movement made by an organism towards or away from a source of stimulation.

tropism

a bending growth movement in a plant either away from or towards a directional stimulus. Tropic movements are brought about by unequal growth on the two sides of an organ (such as the stem) brought about by unequal distributions of AUXIN. See PHOTOTROPISM, GEOTROPISM, THIGMOTROPISM, CHEMOTROPISM.