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The Mimosa pudica plant undergoes an immediate response to touch or vibration, known as thigmonasty. The plant's leaves close up quickly after stimulated. This is a defensive mechanism as it lowers the surface area available to herbivores. It is also a mechanism that can be used to shake off smaller insects who might be attempting to feed on it. The most popular thigmonastic movement is that which the Venus flytrap undergoes when closing its modified leaves to trap its prey.
Thigmotropism. The sensitive plant Mimosa pudica responds to touch by folding its leaflets together. The folding is caused by curving of the pulvinus (motor organ) where cells on one side loses water and becomes flaccid, while cells on the opposite side retain their turgor.