Q.Epinasty is a movement of:

Nastic movements are curvature responses triggered by an external stimulus that is diffused rather than unidirectional, so the direction the organ bends depends on the organ's own structure, not on the stimulus's direction - and, mechanically, they are driven by reversible turgor changes rather than by unilateral growth (the opposite mechanism from tropic movements). Nyctinastic (sleep) movements are the diurnal opening and closing of leaves or flowers, driven by turgor changes on opposite sides of the pulvinus as water enters or leaves; they include photonasty (triggered by light, e.g. leaves opening by day and closing at night) and thermonasty (triggered by temperature, e.g. Crocus flowers opening in heat and closing in cold). Seismonastic movement is the touch/shock response of Mimosa pud …