Question

The closing and opening of the leaves of Mimosa pudica is due to

(a) thermonastic movement 

(b) hydrotropic movement 

(c) seismonastic movement 

(d) chemonastic movement

Answer 1

The correct option is (c) seismonastic movement.

Explanation:

Seismonastic movements are nastic movements of turgor in response to stimulus of shock (like touch/mechanical/electrical/thermal/chemical shock). On touching Mimosa pudica, its leaves droop down and the stimulus travels at the speed of 1 cm/sec.