CBSE Class 9 Answered

Potato skin is composed of suberized phellem cells, the outer component of the tuber periderm. Following suberization of their walls, the phellem cells die, thus creating an outer defensive layer. The cell corpses are filled with air and therefore provide thermal insulation, the suberized walls prevent invasion by micro-organisms and wax deposits that are embedded in the suberin material prevent desiccation of the plant tissue.

Kindly post each query separately.