Answer :

Epidermis:1. Single layered group of cells that cover plant leaves, flowers, root and stem.    2. It is permeable in nature. Protect against water loss, gas exchange and absorb water and minerals.

Cork:1. The cork is a water proof protective layer (bark) present on the cork trees. It consist of dead cells. 2. Impermeable in nature.

shobhit
epidermis is the outer skin of plant till  its stem is delicate and the outer portion is living.it is made up of living cells.
                             whereas
cork is the skin of adult tree which is made up of dead cells.