Question

plant which closes it leaves when you touch it ​

Answer 1

When touched, this sensitive leaf reacts to stimulus as there is a higher pressure at that point and the water in the vacuoles of the cells of the leaf lose water to the adjacent cell. All the water escapes the leaf (via the pulvinus) which then becomes flaccid. This causes the leaves to close.

Sensitive plant

Sensitive plant, (Mimosa pudica), also called humble plant, plant in the pea family (Fabaceae) that responds to touch and other stimulation by rapidly closing its leaves and drooping.