Stelar regions are formed from
a)	Periblem	b)	Plerome	c)	Dermatogen	d)	Tunica

(d)

Endodermis is the innermost limiting layer of cortex which separates the vascular tissue from cortical cells. In some dicots the endodermal cells bear characteristic thickening on then walls, the Casparian thickenings. The thickenings are restricted to radial and inner tangential walls.