Question

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?

Answer 1

Plant showing thigmotropism: The pea plant’s tendrils coil around a support when they come in contact with it, showing a growth response towards touch.

Plant showing thigmonasty: The touch-me-not plant (Mimosa pudica) leaves fold and droop when touched, showing a non-directional response to touch.