QS Study

Difference between endodermis and exodermis


  • The endodermis is the parenchymatic tissue inside the root.
  • The endodermis represents an unicellular cell layer separating the central cylinder of the root from the cortex.
  • The endodermis controls flow of water and minerals within the plant. In most plants, this tissue is restricted to the roots.
  • It also functions in structural support for the stele, particularly in drying soil, and minimizes shrinkage or swelling of the cells of the stele.


  • The exodermis is the other membrane of the root.
  • The exodermis represents an unicellular cell layer located at the outer surface of the root directly below the root epidermis.
  • The exodermis, forming an ‘outer’ apoplastic barrier at the root surface, mainly establishes the root/soil interface between the root and the soil environment surrounding the root.
  • It is a layer of the outer living cortical cells of plants that takes over the functions of the epidermis in roots lacking secondary thickening.