Give any two examples for “Nano" in nature.

Explanation

(i) Lotus leaf surface: Scanning electron micrograph (SEM) showing the nano structures of the surface of a leaf from a lotus plant. This is the reason for self cleaning process in lotus leaf.
(ii) Peacock feathers: Get their iridescent coloration from light interacting with 2 dimensional photonic crystal structures just tens of nanometers thick.