UNI101Y1 Study Guide - Tonicity, Osmosis, Dissolved Load

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Cells on exterior of leaf are coated w/ waxy cuticle. Gas exchange occurs through ssttoommaatteess/ssttoommaattaa/sing. ssttoommaa (small openings at leaf surfaces) Plants close stomates to reduce water loss (but also prevents co2 from entering) As water pot. decreases, the guard cells bordering a stomate collapse, causing them to press together and shut off the opening. Orgnms must balance losses of water and dissolved substances w/ intake. When they drink water that is diff. in solute conc. than their bodies, they must make up the deficit or rid themselves of excess. Solutes are left behind when water evaporates from orgnm surfaces. High salt conc. can disrupt cell function. Oossmmoorreegguullaattiioonn is the mechanism that organisms use to maintain a proper salt balance. Pump excess salts back into soil by active transport across their root surfaces. Mangroves grow on coastal mudflats inundated daily by high tides (imposes high salt load; saltwater has high osmotic pot. )

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