BIOA02H3 Lecture Notes - Lecture 10: Casparian Strip, Semipermeable Membrane, Symplast

• School: UTSC
• Department: Biological Sciences
• Course: BIOA02H3
• Professor: Ivana Stehlik

Document Summary

Basic plant needs involve getting glucose from light, water and carbon dioxide water and mineral uptake happens through the roots and goes up through the xylem // phloem goes down. Water moves upward in a small tbe thorugh adhesion to tube walls and choehsion between water moelcules depends on the. Capillary action fact that the water moelcules are kept together by cohesion. Narrow tubes = higher rise the limit is 1m. Water move up through a semi-permeable membrane (eg. cellwall) from low concentration to high concentrated solution until concentration on both membranes are equal. Plant actively manipulates higher [ ] on the inside than outside results in water flowing in through the semi- permeable membrane and pushing inward to establish equilibrium. Plants often have high solute concentrations in root hairs water moves into the cells through osmosis. As water heats up (transported from xylem) water evaporates, is pushed through the spongy mesophyll and is pushed out of the leaf.