Water Potential and Osmosis

Pure water has a water potential of ___.

• 1
• 0
• -1
• 100

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 celcius.  Identify the approximate concentration of sucrose in the potato cells.

• 0.13 M
• 0.0 M
• 0.4 M
• 0.33 M

Tags

NGSS.HS-LS2-3

NGSS.HS-LS2-4

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 celcius.  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 celcius.  Sucrose is too large of a molecule to cross the membrane of potato and carrot cells.  Calculate the water potential for the carrot cells.  The ionization constant for sucrose is 1.0 M.  The pressure potential is 0.

• -8.1 bars
• -8.1 M
• 8.1 bars
• -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 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?

• .43 M
• .30 M
• 0.0 M
• 1.0 M

Tags

NGSS.HS-PS1-5

Which way would the purple molecules move through the semi-permeable membrane?

• From the  A side  to the B-side
• From the B side to the A side
• none of the purple molecules would move
• they would move equally back and forth in a state of dynamic equilibrium

If there is 5 percent water inside a cell and 5 percent water outside a cell

• More water will move inside the cell
• More water will move outside the cell
• There will be no net movement of water 
• No water molecules will cross the membrane

While eating a salty french fry, the cells of a person's tongue would...

• get smaller
• get bigger
• remain the same size

Tags

NGSS.HS-LS1-3

When the concentration inside and outside of the cell is equal the solutiom is _________ to the cytosol.

• Isotonic
• Hypertonic
• Hypotonic
• Concentration