The water flow beyond cortex in roots only through symplastic pathway.why? Share with your friends Share 3 Anugrah Varghese answered this This due to the presence of suberised casperian strips which is impermeable to water. HOPE THIS HELPS YOU !!!! 2 View Full Answer Anupam Upadhyay answered this This is because the apoplastic movement of water stops at casparian strip of endodermis so from there they start symplastic movement. 8