Question

Osmosis induces the movement of leaflets of touch-me-not. How?

Answer 1

The touch-me not shrinks due to loss of turgidity (the pressure of content against the cell wall) by cell with in pulvini-specialised motor organs at leaf joints.Upon stimulation ,like touching,the leaf cell lose potassium ions ,triggering water to leave the cell through osmosis .
It take about 10 minutes for the cells to regain turgidity and leaves to open out.