AP Biology Water Potential Problems

Distilled water (zero solute) has a water potential of ___.

• 1

• 0

• -1

• -100

If a cell’s pressure potential is 3 bars, and the solute potential is -4.5, what is the resulting water potential of the cell?

• -1.5 . bars

• 7.5 bars

• 3 bars

• -7.5 bars

If a plant cell has a water potential of -2 bars and a pressure potential of 2 bars, what is the cells solute potential?

• 4 bars

• 0 bars

• -4 bars

• 2 bars

A cell with a water potential of -1.5 bars is placed in a beaker with a sugar solution that has a water potential of -4 bars. In which direction the net flow of water be?

• Into the cell

• Out of the cell

• There will be no net movement of water

• Into the cell at first and then out

Animal cells with a 0.5M glucose concentration are placed in a solution with a 0.8M glucose concentration. The 0.8M solution is ____________ to the cells.

• Isotonic

• Hypertonic

• Hypotonic

A plant cell has a 0.6M NaCl concentration. What is the water potential of this cell if it is at 20 degrees Celsius (assume pressure potential is 0).

• -34.5 bars

• -14.6 bars

• -29.2 bars

• -1.99 bars

A solution has a 0.1M sucrose concentration. Plant cells with a 0.5M sucrose concentration are placed in the solution. What type of solution is this and what will happen to the cells?

• hypertonic and the cells will lose water

• hypertonic and the cells will swell with water

• hypotonic and the cells will swell with water

• hypotonic and the cells will lose water

An animal cell has a 0.76M glucose concentration and is at 25 degrees Celsius. If an external pressure of 10 bars is applied to the cell what is the overall water potential of the cell?

• -18.8 bars

• -37.6 bars

• -8.8 bars

• -28.8 bars

A plant cell has a solute potential of -14.4 bars.  The cell is placed in an environment with a solute potential of -10.3 bars.  Will water flow into or out of the plant cell?

• Into the cell

• Out of the cell

A student places a potato cube into a beaker of distilled water as shown. The potato cube has a ψp

​ of 7.2 bars and a ψsof -9.8 bars. Which of the following is true?

.

• The potato cells have a water potential of -2.6 bars while the beaker has a water potential of 17.6

• The potato cells have a water potential of 0 while the beaker of water has a water potential of 0.

• The potato cells have a water potential of -2.6 while the beaker of water has a water potential of 0.

• The potato cells have a water potential of 0 while the beaker of water has a water potenial of -2.6.