Define osmosis. THE MOVEMENT OF WATER ACROSS A SELECTIVELY PERMEABLE MEMBRANE FROM AN AREA OF HIGH CONCENTRATION TO AN AREA OF LOW CONCENTRATION.
In which direction does water move across membranes, up or down the concentration gradient? DOWN
Define these 3 terms:
a. isotonic- THE CONCENTRATION OF DISSOLVED PARTICLES ARE THE SAME INSIDE AND OUTSIDE THE CELL – THERE IS NO OVERALL CHANGE IN THE CELL SIZE
b. hypertonic THE CONCENTRATION OF DISSOLVED PARTICLES ARE HIGHER OUTSIDE THE CELL THAN INSIDE THE CELL– WATER WILL LEAVE THE CELL IN AN ATTEMPT TO DILUTE THE OUTSIDE CONCENTRATION
c. hypotonic THE CONCENTRATION OF DISSOLVED PARTICLES ARE LOWER OUTSIDE THE CELL THAN INSIDE THE CELL– WATER WILL ENTER THE CELL IN AN ATTEMPT TO DILUTE THE INSIDE CONCENTRATION
Use arrows to show the direction of water movement into or out of each cell. Color and label the cell in an isotonic environment light blue, the hypotonic environment yellow, and the hypertonic environment light green.
[Image shows three cells with arrows indicating water movement: first cell (green) has water moving out, second cell (blue) has no net movement, third cell (yellow) has water moving in]
Match the description or picture with the osmotic condition:
A. Isotonic
B. Hypertonic
C. Hypotonic
__C__ solution with a lower solute concentration
__A__ solution in which the solute concentration is the same
__A__ condition plant cells require
__A__ condition that animal cells require
__C__ red blood cell bursts (cytolysis)
__C__ plant cell loses turgor pressure (Plasmolysis)
__C__ solution with a higher solute concentration
__B__ solution with a higher solute concentration
__A__ plant cell with good turgor pressure
__C__ solution with a high water concentration
Label the tonicity for each solution (isotonic, hypotonic, or hypertonic):
HYPOTONIC
ISOTONIC
HYPERTONIC
HYPOTONIC
ISOTONIC
HYPERTONIC
Parent Tip: Review the logic above to help your child master the concept of tonicity and osmosis worksheet.
