Question

What are nastic and curvature movement ?

Answer 1

Nastic movement are non directional curvature movement of turgor or growth , when the movements are determined by the structure of responding organ irrespective of the direction of structure which is generally diffused.

Curvature movements are the changes in the orientation of some plant parts in relation to others caused by intrinsic or external stimuli .

Answer 2

Movement of the plants in response to am external stimulus is called nastic movement. The plant may grow towards or away from the stimulus. It is caused by differential turgor pressure or hormone build up in the plant parts exposed to the stimulus. ... Curvature movements is movement of plant parts in or other direction.