Question

Why does water trickle off lotus leaves

Answer 1

Some plant leaves can't get wet or grimy. Lotus plants have superhydrophobic surfaces. Water drops that fall onto them dab up and move off. These leaves remain dry, as well as the beads get little particles of dirt as they move so that the lotus leaves are even self-cleaning.

Dirt particles are grabbed by water beads due to the smaller scale and nanoscopic engineering at first glance, which limits the bead's bond to that surface.