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12 Cards in this Set
- Front
- Back
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Water Potential (ψ)
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The tendency for water to move from one region to another
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In terms of water potential, in what direction will water move (assuming it is not bound to solute or surfaces)?
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From regions of high water potential to regions of low water potential
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What unit of measure is used in calculating water potential?
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Megapascals (MPa)
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To what form of water has the value ψ = 0 been assigned?
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Pure water in a container open to the atmosphere at sea level and room temperature (standard conditions)
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The Water Potential Equation
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ψ = ψs + ψp
ψ = Water potential ψs = Solute/Osmotic Potential ψp = Pressure Potential |
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Solute Potential (ψs)
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The number of dissolved solute molecules in a solution; also called osmotic potential due to its effect on osmosis direction
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Why is solute potential always negative?
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Solutes bind to water molecules and reduce the number of free water molecules able to do work
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Pressure Potential (ψp)
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The physical pressure on a solution; can be positive or negative
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Turgor Pressure
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The pushing of a cell's plasma membrane against the cell wall by the cell's contents
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Plasmolysis
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The shrinking of a plant cell due to water loss
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Wilting
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Drooping of leaves and stems as a result of cells becoming flaccid
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Aquaporins
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Transport proteins that allow water to diffuse into a cell
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