Non-directional plant movements in response to stimuli, where the direction of movement is determined by the plant's structure rather than the direction of the stimulus. These movements are typically rapid and reversible, involving changes in turgor pressure.
From Greek 'nastos' meaning 'pressed close' or 'squeezed,' first used in botanical contexts in the late 1800s. The term distinguishes these movements from tropisms, emphasizing that the response direction is predetermined by plant anatomy rather than stimulus direction.
Nastic movements are the plant world's equivalent of reflexes! Unlike tropisms that grow toward stimuli, nastic movements are pre-programmed responses - like how a Venus flytrap always snaps shut the same way regardless of where the fly lands.
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