KCET 2017 Biology Solved Paper

Suberin is a waterproofing waxy substance which is found in higher plants. It is found in the phellem layer of the periderm in the stem and forms the casparian strips in the endodermis of root cells. prevents wall to wall movement of substance between cortex and stele thus acting as biological check post and movement can be possible only when substance is absorbed by cytoplasm of endodermal cells.