The key difference between thigmotropism and thigmonasty lies in the directionality of the plant’s response to touch:
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Thigmotropism:
- Directional: The plant’s growth or movement is directed towards or away from the point of contact.
- Example: A vine tendril coiling around a support. The tendril grows and curls in the direction of the object it touches.
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Thigmonasty:
- Non-directional: The plant’s movement occurs regardless of the direction of the touch stimulus.
- Example: The Venus flytrap snapping shut. The trap closes regardless of where on the trap the insect touches.
In simpler terms:
- Thigmotropism: Plant grows towards or away from touch.
- Thigmonasty: Plant moves in a specific way when touched, but not necessarily towards or away from the touch.