Question

When the leaves of a Mimosa pudica plant are touched with a finger, they fold up quickly. This is an example of :

(a) chemotropism

(b) thigmonasty

(c) photonasty

(d) thigmotropism

Answer 1

Chemotropism is the movement of plants in response to the chemicals.

The leaves of a Mimosa pudica plant are touched with a finger, they fold up quickly. This is an example of thigmonasty. The term thigmonasty is a nastic response of a plant to touch or vibration.

Photonasty is the movement of plants associated with the changes in the intensity of light.

Thigmotropism is the movement of plants in response to touch or physical contact.