Plant Physiology: Water Potential

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Why are the units for water potential in pressure?

Plant cells are under pressure and it is easier to measure pressure (correct)

Plant cells are under pressure and it is difficult to measure temperature

Plant cells are under temperature and it is difficult to measure pressure

Plant cells are under temperature and it is easier to measure pressure

What is water potential (Ψw) a measure of?

The taste of water

The temperature of water

The energy state of water (correct)

The color of water

What is the equation for water potential?

$Ψw = Ψp * Ψs * Ψg * Ψm$

$Ψw = Ψp + Ψs + Ψg + Ψm$ (correct)

$Ψw = Ψp - Ψs - Ψg - Ψm$

$Ψw = Ψp / Ψs / Ψg / Ψm$

What does the solute potential (Ψs) represent?

The contribution due to dissolved solutes Signup and view all the answers

Why is the solute potential (Ψs) of any solution at atmospheric pressure always negative?

Less free water molecules to do work Signup and view all the answers

Water potential (Ψw) is the sum of the contributions of the various factors that influence water potential: Ψw = Ψp + Ψs + Ψg + Ψm

equation Signup and view all the answers

Solutes always decrease the free energy of water, thus their contribution is always ______.

negative Signup and view all the answers

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 Signup and view all the answers

Solute potential is also called the ______ because solutes affect the direction of osmosis.

osmotic Ψ Signup and view all the answers

Ψs of any solution at atmospheric pressure is always ______ – why.

negative Signup and view all the answers

What are the units for measuring pressure in water potential?

The units for measuring pressure in water potential are in MPa (megapascals). Signup and view all the answers

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). Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers

What is water potential (Ψw) a measure of?

Water potential (Ψw) is a measure of the energy state of water. Signup and view all the answers

What is the equation for water potential?

Water potential (Ψw) = Ψp + Ψs + Ψg + Ψm Signup and view all the answers

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) Signup and view all the answers

What are the units for measuring pressure in water potential?

The units for measuring pressure in water potential are in MPa (megapascals) Signup and view all the answers

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 Signup and view all the answers

What is water potential (Ψw) a measure of?

Water potential (Ψw) is a measure of the energy state of water Signup and view all the answers

Plant Physiology: Water Potential

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Questions and Answers

Why are the units for water potential in pressure?

What is water potential (Ψw) a measure of?

What is the equation for water potential?

What does the solute potential (Ψs) represent?

Why is the solute potential (Ψs) of any solution at atmospheric pressure always negative?

Water potential (Ψw) is the sum of the contributions of the various factors that influence water potential: Ψw = Ψp + Ψs + Ψg + Ψm

Solutes always decrease the free energy of water, thus their contribution is always ______.

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).

Solute potential is also called the ______ because solutes affect the direction of osmosis.

Ψs of any solution at atmospheric pressure is always ______ – why.

What are the units for measuring pressure in water potential?

What is the equation for solute potential (Ψs)?

Why is the solute potential (Ψs) of any solution at atmospheric pressure always negative?

What does the solute potential (Ψs) represent?

What is water potential (Ψw) a measure of?

What is the equation for water potential?

What is the equation for solute potential (Ψs)?

What are the units for measuring pressure in water potential?

Why is the solute potential (Ψs) of any solution at atmospheric pressure always negative?

What is water potential (Ψw) a measure of?

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