AP BIOLOGY

Detailed explanation-1: -Casparian strips are a cellular feature found in the roots of all higher plants. They are ring-like, hydrophobic cell wall impregnations. These impregnations occur in the endodermis, an inner cell layer that surrounds the central vascular strand of roots (Figure 1).

Detailed explanation-2: -The Casparian strip creates a barrier to harmful chemicals, like herbicides, which cannot pass through it. Without this strip, such chemicals would have spread throughout the plant via the xylem, thus killing it. It also prevents harmful microbes from gaining entry into the plant and causing infections.

Detailed explanation-3: -The Casparian strip in the root endodermis forms an apoplastic barrier between vascular tissues and outer ground tissues to enforce selective absorption of water and nutrients.

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.