Water Potential Practice

• -7.5

• 7.5

• -1.5

• 1.5

A blood cell is placed into the jar, as seen. Where will the water go?

• Into the cell
• Out of the cell
• Equally in & out - it's isotonic
• The water is a lie

Tags

NGSS.MS-LS1-2

 An animal cell placed in a hypertonic (salty) solution will

• Stay the same
• Shrink- get smaller
• Swell- get bigger

Tags

NGSS.HS-LS1-3

Mathematical Equivalence

ON

What is the total water potential equation?

• Y = Ys + Yp

• Y = Ys - Yp

• Y = Ys * Yp

• Y = Ys / Yp

What is the effect of solutes on a solution's overall water potential?

• Increases water potential

• Decreases water potential

• Has no effect on water potential

• Creates equilibrium

Calculate the water potential of a solution with a solute potential of -2.5 bars and a pressure potential of 0.9 bars.

• -2.5 bars

• -1.6 bars

• -3.4 bars

• 0.9 bars

A cell with a solute potential of -2.6 bars and a pressure potential of 1.2 bars is placed in a beaker with a solute potential of - 3.6 and a pressure potential of 0. Calculate the water potential of both the cell and the solution in the beaker. Predict what will happen to the cell's size, justify your prediction.

Answer explanation

Cells water potential is -1.4 bars and the solution's water potential is -3.6 bars. The cell will shrink as water flows out of the cell. This is because the water potential of the cell at -1.4 bars is higher than the water potential of the solution at -3.6 bars. Water flows from an area of high water potential to low water potential, thus water will move out of the cell.

Water Potential = Solute Potential + Pressure Potential

Add the cells solute potential and pressure potential (make sure to keep the negative value) and compare it to the solutions water potential. The one that is closest to zero (less negative) has a higher water potential)