Some plants have evolved with large leaves to ... So that must be because of the waxy layer - the cuticle. Ms Armit: Precisely. Another very important part of the leaf are the palisade cells.

“Cuticle thickness affects dynamics of volatile emission from ... VOCs can’t diffuse out of flower cells quickly enough to prevent internal damage to the plant. In follow-up experiments to find out ...

He provides evidence that “apolar substances of low dielectric constant” greatly increase the permeability of the outer lipoid layer of the cuticle.

Bark - Many plants are covered with a thick bark. This is an external layer of dead cells which forms a physical barrier against infection. In this way it is very much like human skin.