20 Questions
Why are the units for water potential in pressure?
Plant cells are under pressure and it is easier to measure pressure
What is water potential (Ψw) a measure of?
The energy state of water
What is the equation for water potential?
$Ψw = Ψp + Ψs + Ψg + Ψm$
What does the solute potential (Ψs) represent?
The contribution due to dissolved solutes
Why is the solute potential (Ψs) of any solution at atmospheric pressure always negative?
Less free water molecules to do work
Water potential (Ψw) is the sum of the contributions of the various factors that influence water potential: Ψw = Ψp + Ψs + Ψg + Ψm
equation
Solutes always decrease the free energy of water, thus their contribution is always ______.
negative
The solute potential of a solution can be ______ with the van’t Hoff equation: Ψs = - miRT where m = molality (moles/1000 g); i = ionization constant (often 1.0); R R= gas constant (0.0083 liter x MPa/mol deg); and T = temperature (K).
calculated
Solute potential is also called the ______ because solutes affect the direction of osmosis.
osmotic Ψ
Ψs of any solution at atmospheric pressure is always ______ – why.
negative
What are the units for measuring pressure in water potential?
The units for measuring pressure in water potential are in MPa (megapascals).
What is the equation for solute potential (Ψs)?
The equation for solute potential (Ψs) is given by the van’t Hoff equation: $Ψs = -miRT$ where m = molality (moles/1000 g); i = ionization constant (often 1.0); R = gas constant (0.0083 liter x MPa/mol deg); and T = temperature (K).
Why is the solute potential (Ψs) of any solution at atmospheric pressure always negative?
The solute potential (Ψs) of any solution at atmospheric pressure is always negative because solutes always decrease the free energy of water, thus their contribution is always negative.
What does the solute potential (Ψs) represent?
The solute potential (Ψs) represents the contribution due to dissolved solutes. Solutes always decrease the free energy of water, thus their contribution is always negative.
What is water potential (Ψw) a measure of?
Water potential (Ψw) is a measure of the energy state of water.
What is the equation for water potential?
Water potential (Ψw) = Ψp + Ψs + Ψg + Ψm
What is the equation for solute potential (Ψs)?
Solute potential (Ψs) = - miRT, where m = molality (moles/1000 g), i = ionization constant, R = gas constant (0.0083 liter x MPa/mol deg), and T = temperature (K)
What are the units for measuring pressure in water potential?
The units for measuring pressure in water potential are in MPa (megapascals)
Why is the solute potential (Ψs) of any solution at atmospheric pressure always negative?
The solute potential of any solution at atmospheric pressure is always negative because solutes decrease the free energy of water
What is water potential (Ψw) a measure of?
Water potential (Ψw) is a measure of the energy state of water
Learn about water potential, a crucial concept in plant physiology, which determines the direction and movement of water. Understand the measurement of water potential and its units in pressure, crucial for understanding plant cell behavior.
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