primary structure of root：
1.Epidermis：only one layer of cells，closed arrangement，elongated along face，older zone may show cutinized on the outer wall.possess root hairs.without intercellulose space and chloroplast.
2.Cortex:consist mainly of parenchyma cells.root cortex is wider than stem cortex.
Exodermis:arranged closed.without intercellulose space.
Cortexparenchyma:arranged loosely.very wide.cells large.consist of homogeneous parenchyma cells.posses intercwllulose space and persent starch.
Endodermis:single layer of cells.2 radial and 2 end wall are showing strip shape thickened on the inner surface of cell wall termed casparian strip.
3.Vascular Cylinder:
Pericycle:adjacent to the endodermis .possess meristematic potentialities.
Primary Xylem AND Primary Phloem:
Primary xylem:star angle shape.various 2-8
Primaryphloem:located betweem xylem angles.arranged in alternate manners.contain sieve tube.companion cells.parenchyma cells andq few fibers.
1.Epidermis：only one layer of cells，closed arrangement，elongated along face，older zone may show cutinized on the outer wall.possess root hairs.without intercellulose space and chloroplast.
2.Cortex:consist mainly of parenchyma cells.root cortex is wider than stem cortex.
Exodermis:arranged closed.without intercellulose space.
Cortexparenchyma:arranged loosely.very wide.cells large.consist of homogeneous parenchyma cells.posses intercwllulose space and persent starch.
Endodermis:single layer of cells.2 radial and 2 end wall are showing strip shape thickened on the inner surface of cell wall termed casparian strip.
3.Vascular Cylinder:
Pericycle:adjacent to the endodermis .possess meristematic potentialities.
Primary Xylem AND Primary Phloem:
Primary xylem:star angle shape.various 2-8
Primaryphloem:located betweem xylem angles.arranged in alternate manners.contain sieve tube.companion cells.parenchyma cells andq few fibers.
