What do you mean by seismonastic movement?

A seismonastic movement is a type of nastic (non-directional) movement in plants that occurs in response to mechanical stimuli, touch, or vibration, not in a particular direction.

Key points:

• It is stimulus-dependent but independent of the direction of the stimulus.
• Example: Mimosa pudica (touch-me-not plant) folds its leaves when touched.
• The movement is usually rapid and involves changes in turgor pressure in specialized motor cells called pulvini.

So, in short: plant movement triggered by touch or mechanical shock, direction doesn’t matter.