Question

(a) What is meant by nastic movements in plants? Give one example of nastic movements in plants.
(b) What is the difference between photonasty and thigmonasty?

Answer 1

(a) The non-directional movement of a plant part in response to an external stimulus is known as nastic movement . The folding up of leaves in sensitive plants in response to touch is an example of nastic movement.

(b)

Photonasty	Thigmonasty
It is the non-directional movement in plants in response to light.	It is the non-directional movement in plants in response to touch.