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AP Biology - Water Potential Flashcards

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7978921699Water PotentialMeasure of how freely water molecules can move0
7978921700Law of ThermodynamicsWater moves from regions of high energy to low energy1
7978921701OsmosisWater diffuses from areas of high concentrations to low concentrations2
7978921702Negative Water Potential__________________________________ indicates a decrease in water potential as water molecules move less freely due to higher concentrations of solute3
7978921703EquilibriumZero water potential indicates ___________________4
7978921704Transpiration____________ occurs due to variations in water potential throughout the plant5
7978921705HypotonicWhen water diffuses into a plant cell when it is placed in a solution of higher water potential than inside it, the cell contents will expand, pushing against the cell wall, and the cell wall will become turgid6
7978921706HypertonicIf a plant cell is placed in a solution of lower water potential, water will diffuse out, causing the cytoplasm to shrink and become flaccid. If enough water leaves, the cytoplasm pulls from the cell wall, and the cell becomes plasmolysed7
7978921707IsotonicConcentration of solutes is equal inside and outside the cell, so water moves across the membrane in both directions maintaining cell size8
7978921708Animal Cells___________________________ do not have cell walls, so if an animal cell expands excessively the cell will burst open and become haemolysed9

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