屈くっ性せい

noun

tropism

Biological term for directional growth or movement of an organism in response to an external stimulus, such as light or gravity. Compare with 傾性 (nasty), which is non-directional.

See also: 傾性

• 植しょく物ぶつの茎くきが光ひかりの方ほう向こうに曲まがるのは、正せいの光ひかり屈くっ性せいの例れいです。

  The bending of a plant stem toward light is an example of positive phototropism.

• 屈くっ性せいは刺し激げきの方ほう向こうによって成せい長ちょうの向むきが決きまる現げん象しょうです。

  Tropism is a phenomenon in which the direction of growth is determined by the direction of the stimulus.