Why the upper part of the leaf is the common location of most of cuticle?

Question

botany

Answer 1

Well, because the cuticle's main function is for function as permeability barriers for water and water-soluble materials. The cuticle both prevents plant surfaces from becoming wet and helps to prevent plants from drying out.

So, to perform its tasks, it should be on the upper part of the leaf, because this is where transpiration occurs.

Answer 2

what she said, and the upper part of the leaf faces the sunlight so it needs protection from too many rays