Biology / Unit 11 Bio 2557 short lesson, about 20 seconds
Thigmotropism and Thigmonasty
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The idea
Thigmotropism is directional growth toward touch, as in a coiling tendril; thigmonasty is a touch response independent of the stimulus's direction, as in a snapping flytrap.
In practice
A pea tendril coils toward whatever it contacts, while a flytrap's leaves snap shut regardless of which side an insect brushes.
Where people slip
Thigmonasty's speed differs from thigmomorphogenesis, the slower thickening triggered by sustained stress such as wind.
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