Question

Why are the cells of epidermis of a leaf thin and transparent?

Answer 1

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Upper epidermis.This is a single layer of cellscontaining few or no chloroplasts. The cellsare quite transparent and permit most of the light that strikes them to pass through to the underlying cells. The upper surface is covered with a waxy, waterproof cuticle, which serves to reduce water loss from theleaf.

Answer 2

as epidermis of plant help plant to exoss the oxygen from inside to outside epidermis are small hols present in plants left which do the process of  give air to plant