Apoplast is the system of adjacent cell walls that is continuous throughout the plant except at the

The apoplast is the free dimensional space outside the plasma membrane through which the material can diffuse freely. The water and minerals travel along the cell walls of the root hairs, cortical cells and endodermis. Most of the water flow in root occurs via apoplast as their cortical cells are loosely arranged and hence offer no resistance to water movement, but sometimes it is interrupted by Casparian strips in roots. Casparian strips are the thick waterproof band are of impermeable suberin which is present in the endodermis of the cells.