Which specialized cell layer in the root epidermis forms a barrier that regulates the uptake of water and minerals through the apoplastic pathway?

💡 Solution & Explanation

The endodermis contains the Casparian strip, a water-impermeable suberized band that blocks the apoplastic movement of water and minerals, forcing them to enter the symplastic pathway through the plasma membrane. Tissues like the pericycle and exodermis perform different functions related to lateral root initiation and outer protective root layers. The Casparian strip is composed of the fatty substance suberin, which prevents backflow of water into the cortex.