Water Potential

If a cells  $\Psi p$ = 3 bars and its  $\Psi s$ = -4.5 bars, what is the resulting  $\Psi$  ?

• -7.5

• 7.5

• -1.5

• 1.5

A plant cell with a $\Psi s$  of -7.5 bars keeps a constant volume when immersed in an open-beaker solution that has a  $\Psi s$  of -4 bars.  What is the cells  $\Psi p$  ?

• -4

• -7.5

• -3.5

• 3.5

What is the $\Psi s$   of a 1.0M sugar solution at 22 $\degree$ C under standard atmospheric conditions?

• -24.5 bars

• 24.5 bars

• -2.45

• 2.45

At 22 $\degree$ C, zucchini cores are measured and determined to have a sucrose concentration of 0.36M. What is the $\Psi s$   of these cells and in which direction will the net flow of water be?

• 0.64 net flow of water out of the cell

• -0.36 net flow of water into the cell

• 8.17 net flow of water out of the cell

• -8.83 net flow of water into the cell

Tags

NGSS.HS-LS2-4

Which of the following statements is true?

• Water is transported actively against a concentration gradient.

• Water flows into the direction of the lowest water potential.

• Active transport is ATP-independent.

• Osmosis requires impermeable membranes.

A saltwater fish is accidentally placed in a freshwater aquarium in a few short hours it sadly died. Which explains why this occurred?

• The cells of the fish body were dehydrated by the quick loss of water. 
• The cells of the fish quickly absorbed massive amounts of water and it ended up killing the fish.  
  
• The fish hated the new decor in the freshwater tank. 
• It was just its time. 

Tags

NGSS.MS-LS1-3

NGSS.MS-LS1-2

Pure water has a water potential of ___.

• 1
• 0
• -1
• 100

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

Assume that the “cell” below is permeable to sucrose, glucose, and water but impermeable to starch. Which of the following statements is correct?

• (A) Starch will diffuse into the cell.

• (B) Starch will diffuse out of the cell.

• (C) There will be no net movement of glucose

• (D) Glucose will diffuse into the cell

• (E) Sucrose will diffuse into the cell

An animal cell with a solute potential of -2.0 bar is placed into a solution with a solute potential of -1.5 bar. What is the net direction of water?

• a. Into the cell

• b. Out of the cell

• c. The cell is at equilibrium.

• d. Equal amounts of water move into and out of the cell.