What is the difference between thigmotropism and thigmonasty? Name one plant which exhibits thigmotropism and one plant which exhibits thigmonasty. What behaviour (or responses) of these plants make you think that they exhibit thigmotropism and thigmonasty respectively?
Thigmotropism is the directional growth movement of a plant part in response to the stimuli (touch). Example - Tendrils
Thigmonasty is non-directional movement of a plant part in response to the stimuli (touch). Example – Mimosa pudica (Touch me not or Chui-mui plant)
Tendrils grow towards a stimulus (touch) and show directional movement and represent thigmotropism. In case of thigmonasty, the folding of leaves in Mimosa pudica (Touch me not or Chui-mui plant) is not depend on the direction of stimulus.