AP BIOLOGY

Detailed explanation-1: -Example: The Venus Fly Trap is a plant that shows thigmotropism.

Detailed explanation-2: -The closure of the Venus flytrap represents the nonmuscular movement based on hydraulics and mechanical elasticity.

Detailed explanation-3: -The “trap” is made of two hinged lobes at the end of each leaf. On the inner surfaces of the lobes are hair-like projections called trichomes that cause the lobes to snap shut when prey comes in contact with them. This type of movement is called thigmonasty-a nondirectional plant response to being touched.

Detailed explanation-4: -The non-growth movement in response to an environmental stimulus is called nastic movement. The venus fly trap shows a response to the stimulus of touch when the insect sits on it by closing its leaves.

Detailed explanation-5: -An example of thigmotropism is the coiling movement of tendrils in the direction of an object that it touches. On the other hand, the folding movement of the Mimosa pudica leaflets, can be considered as an example of thigmonastism.