Water Potential Practice

Pure water has a water potential of ___.

• 1
• 0
• -1
• 100

• 0.13 M

• 0.0 M

• 0.4 M

• 0.33 M

Carrot and potato cores were placed in various sucrose solutions for 24 hours and the % change in mass was recorded and graphed.  The temperature in the room was 24 degrees C.  Sucrose is too large of a molecule to cross the membrane of potato and carrot cells.  Which molecule caused the change in mass?

• water
• sucrose
• salt
• glucose

Carrot and potato cores were placed in various sucrose solutions for 24 hours and the % change in mass was recorded and graphed. The temperature in the room was 24 degrees C. Sucrose is too large of a molecule to cross the membrane of potato and carrot cells.  Which of the following concentrations was NOT hypertonic to the carrot cells?

• 0.2 M
• 0.4 M
• 0.6 M
• 1.0 M

Carrot and potato cores were placed in various sucrose solutions for 24 hours and the % change in mass was recorded and graphed.  The temperature in the room was 24 degrees C. Calculate the water potential for the carrot cells if the pressure potential is 0.

• approximately -8.1 bars
• approximately -8.1 M
• approximately 8.1 bars
• approximately -3.5 bars

A sucrose solution in a beaker has a solute potential of -4 bars.  A cell with a solute potential of -2 bars is placed in the beaker.  What is the pressure potential of the cell (assume it was not turgid) before it was placed in the beaker?

• 0 bars
• 2 bars
• -2 bars
• -4 bars

A sucrose solution in a beaker has a solute potential of -4 bars.  A cell with a solute potential of -2 bars is placed in the beaker.  What is the water potential of the cell before it was placed in the beaker if ψ_p = 0?

• 0 bars
• 2 bars
• -2 bars
• -4 bars

A sucrose solution in a beaker has a solute potential of -4 bars.  A cell with a solute potential of -2 bars is placed in the beaker.  What is the water potential of the solution in the beaker?

• 0 bars
• 4 bars
• -2 bars
• -4 bars

A sucrose solution in a beaker has a solute potential of -4 bars.  A cell with a solute potential of -2 bars is placed in the beaker.  What will be the direction for the net movement of water?

• into the cell
• out of the cell
• there will be no net movement

What is the approximate sucrose concentration in the potato core?

• 0.43 M
• 0.28 M
• 0.0 M
• 1.0 M