Thigmonastic

Definition

Thigmonastic movements are plant responses to touch or mechanical stimuli, which occur independent of the direction of the stimulus. These movements are typically rapid and can serve as defense mechanisms or aid in capturing prey.

5 Must Know Facts For Your Next Test

1. Thigmonastic movements are a type of nastic movement, meaning they are non-directional relative to the stimulus.
2. The Venus flytrap exhibits thigmonastic movement by closing its trap when touched.
3. Thigmonasty is usually triggered by changes in turgor pressure within specialized cells.
4. These movements can help protect plants from herbivores or assist carnivorous plants in capturing insects.
5. Mimosa pudica, also known as the sensitive plant, shows thigmonastic responses by folding its leaves upon touch.

Review Questions

Related terms

Nastic Movement: Plant movement that occurs in response to environmental stimuli but is not dependent on the direction of the stimulus.

Turgor Pressure: The pressure exerted by fluid inside the cell against the cell wall, crucial for maintaining cell rigidity and enabling movement.

Venus Flytrap: A carnivorous plant known for its rapid thigmonastic response to touch, allowing it to trap and digest insects.