Question

Why is the folding up of leaves of a sensitive plant on touching with a finger not a tropisms?

Answer 1

it is not case of tropisms because in this case the direction of movement of leaves does not depend on the direction of stimulus

Answer 2

The folding of leaves of a sensitive plant is not a case of tropism (like thigmotropism) because in this case the direction of movement of leaves does not depend on the direction of stimulus (touch).