AP BIOLOGY

Detailed explanation-1: -Casparian strip is generally composed of lignin but sometimes it is composed of suberin. It is mainly formed by the deposition on the radial and transverse walls of the endodermis and is chemically different from the rest of the cell wall.

Detailed explanation-2: -Casparian strips are strips of thickening in the middle of the root endothelium of vascular plants. The chemicals deposited on Casparian strips are Suberin, lignin, and some proteins.

Detailed explanation-3: -The cells of the endodermis typically have their primary cell walls thickened on four sides radial and transverse with suberin, a water-impermeable waxy substance which in young endodermal cells is deposited in distinctive bands called Casparian strips.

Detailed explanation-4: -Casparian strips are the ring-like call wall modifications found in the root of the endodermis of vascular plants. It acts as a barrier to harmful chemicals like herbicides. So it is found in the walls of endodermal cells. Endoderm forms the central and innermost layer of cortex in terrestrial plants.