Question

Why do touch me not plant will close it's leaves after touching it ?

Answer 1

It is caused by the stimulus which is triggered when we touch it.

Answer 2

The leaves close under various other stimuli, such as touching, warming, blowing or shaking.....The stimulus can also be transmitted to neighboring leaves. It is not known excatly why Mimosa pudica involved this trait, but many scientists think that the plant uses it's ability to shrink as a defense from herbivores.