AP BIOLOGY

Detailed explanation-1: -The Casparian strip is a band of waterproof tissue found on the sidewalls of the endodermis of roots. The apoplastic water movement beyond the cortex is blocked by the Casparian strip. It prevents water from entering the pericycle that is important in inducing root pressure.

Detailed explanation-2: -Therefore, the endodermal membrane together with the Casparian strips forms a tight barrier, which regulates the apoplastic pathway, and solutes must move through the selectively permeable plasma membrane into the cytoplasm.

Detailed explanation-3: -Water can move through the roots by three separate pathways: apoplast, symplast, and transmembrane (transcellular). In the apoplast pathway (apoplastic route), water moves through the spaces between the cells and in the cells walls themselves.

Detailed explanation-4: -The symplast is the living region present between two cells which connects one cell with the other. The apoplast pathway is the path in which the water is moving between the intercellular spaces. The apoplast includes the non living spaces between the cells and the cell membranes.

Detailed explanation-5: -Complete answer: Suberin, a waxy material that is impervious to water, is deposited in the root’s endodermis. It works as an apoplastic diffusion barrier and regulates the flow of water into the circulatory system. The symplastic system transports water to the xylem cells.