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WATER MOLECULAR MOVEMENT • A LIQUID IN WHICH A SUBSTANCE DISSOLVES • SOLVENT • WATER MOLECULAR MOVEMENT • NATURE ADORES BALANCE • WIND • HOT AIR MOVING TOWARD COLD AIR • WICKING • WATER MOVING FROM WET TO DRY MOLECULAR MOVEMENT • MOVEMENT OF MOLECULES FROM REGION ON HIGHER CONCENTRATION TO A REGION OF LOWER CONCENTRATION • DIFFUSION • MOVING FROM HIGH TO LOW • ALONG THE DIFFUSION GRADIENT • MOVING FROM LOW TO HIGH • AGAINST THE DIFFUSION GRADIENT MOLECULAR MOVEMENT • MOLECULES EQUALLY DISTRIBUTED IN SPACE • EQUILIBRIUM FIG. 9.2B FIG. 9.2C MOLECULAR MOVEMENT • MEMBRANES THAT ALLOW MOLECULES TO PASS THROUGH • PERMEABLE, OR SEMIPERMEABLE • PLANT MEMBRANES ARE SEMIPERMEABLE MOLECULAR MOVEMENT • NATURAL MOVEMENT OF SUBSTANCE FROM ONE SIDE OF A MEMBRANE OF HIGHER CONCENTRATION TO THE OTHER SIDE OF LOWER CONCENTRATION • OSMOSIS • WATER ENTERS CELLS VIA OSMOSIS MOLECULAR MOVEMENT • THE PRESSURE THAT WOULD BE REQUIRED TO STOP OSMOSIS • OSMOTIC POTENTIAL • THE PRESSURE THAT DEVELOPS ON THE INSIDE OF THE CELL WALL • PRESSURE POTENTIAL • OSMOTIC POTENTIAL + PRESSURE POTENTIAL • WATER POTENTIAL • THE ABILITY OR A SOLUTION TO DRAW WATER TOWARD IT • THE MORE SOLUTES, THE HIGHER THE WATER POTENTIAL MOLECULAR MOVEMENT • PURE WATER • HIGHER WATER POTENTIAL • WATER WITH MORE DISSOLVED SALTS • LOWER WATER POTENTIAL • SOLUTE POTENTIAL IS ANOTHER NAME FOR OSMOTIC POTENTIAL OSMOSIS • ISOTONIC • WATER POTENTIAL SAME INSIDE AND OUTSIDE OF CELL • NO WATER MOVEMENT OSMOSIS • HYPOTONIC • WATER POTENTIAL LOWER INSIDE CELL • MORE SOLUTES INSIDE CELL • WATER MOVES INTO CELL OSMOSIS • HYPERTONIC • WATER POTENTIAL LOWER OUTSIDE CELL • MORE SOLUTES OUTSIDE CELL • SALINE WATER • WATER MOVES OUT OF CELL MOLECULAR MOVEMENT • TWO ADJACENT CELLS • ONE WITH HIGHER WATER POTENTIAL MOVES WATER TO THE ONE WITH LOWER WATER POTENTIAL • WATER IN SOIL HAS HIGHER WATER POTENTIAL THAN WATER INSIDE ROOT CELLS • WATER MOVES FROM SOIL INTO ROOT CELL MOLECULAR MOVEMENT • SALT-CONTAMINATED WATER HAS LOWER WATER POTENTIAL THAN ROOT CELLS • WATER MOVES OUT OF ROOTS • PLASMOLYSIS MOLECULAR MOVEMENT • THE ATTRACTION OF WATER INSIDE ROOTS • OSMOSIS • IMBIBITION • WATER ATTRACTED TO CHARGED PARTICLES INSIDE ROOTS • THIS IS NOT OSMOSIS • SEEDS SWELL WITH GREAT FORCE • LENTILS BREAKING BOX (SEED COAT) MOLECULAR MOVEMENT • ROOTS EXPEND ENERGY TO PUMP WATER INSIDE PLANT • ACTIVE TRANSPORT • WATER AT TIPS OF LEAVES IN MORNING • GUTTATION THROUGH HYDATHODES • NIGHT TIME • NO TRANSPIRATION • ACTIVE TRANSPORT SATURATES PLANT UNTIL PUSHING OUT TIP TRANSPIRATION • MORE THAN 90% OF WATER EVAPORATED THROUGH STOMATA • CORN PLANT TRANSPIRES 4 GALLONS A WEEK TRANSPIRATION • WATER MOVES THROUGH XYLEM BY ATTRACTIVE FORCES • COHESION • WATER MOLECULES ATTRACTED TO EACH OTHER • TRAIN • AS WATER MOLECULE EVAPORATES OUT STOMATA, PULLS THE TRAIN THROUGH THE ROOTS FIG. 9.10 WATER MOLECULES • COHESION • WATER MOLECULES ATTRACTION TO EACH OTHER • ADHESION • WATER MOLECULES ATTRACTION TO SURFACES TRANSPIRATION • OPENINGS ON BOTTOM OF LEAF • STOMATA TRANSPIRATION • GUARD CELLS OPEN AND CLOSE STOMATA • CONTROLS TURGOR PRESSURE WITH POTASSIUM IONS • ABSORB K • GUARD CELLS SWELL WITH WATER AND OPEN STOMATA • DEPARTURE OF K • GUARD CELLS SHRINK AND CLOSE STOMATA TRANSLOCATION • SUGAR (FOOD) PRODUCED IN LEAVES • HIGH CONCENTRATION OF SUGAR SOLUTION • SOURCE CELL • SUGAR (FOOD) SOLUTION MOVES TO LOWER CONCENTRATION CELLS • SINK CELLS • ROOTS • STORAGE CELLS