Name ___________________________________ P. ____
Diffusion Worksheet
1. Use arrows to indicate the direction of diffusion in each case:
cell membrane.
is a cell membrane.
A)
is a molecule that can pass through the
B)
2. For each of the situations below use an arrow to indicate the net movement of sugar into or out of the cell.
(Assume that the sugar molecules can pass through the cell membrane in each case.)
1% sugar
3% sugar
1% sugar
5% sugar
1% sugar
1% sugar
3. The cell membrane is made of a ___________________ ______________________.
4. The cell membrane is ___________________________permeable. This means that ____________
______________________________________________________________________.
5. Diffusion always causes particles to move from a region of _______________ concentration to a region of
______________ concentration.
6. Does a cell expend energy when molecules diffuse in or out of the cell? _____________
7.
Moths emit (give off to the air) chemicals called pheromones to attract a mate.
a) Which process is responsible for the distribution of these chemicals through the air?
b) If a moth detects pheromones, how might it figure out which direction they are coming from?
Osmosis
1. Osmosis is the ____________________ of _______________ across a ______________.
2. In which direction does water move across membranes, up or down the concentration gradient? It
moves _________ the concentration gradient from a _______ concentration to a _________
concentration.
3. Use arrows to show the direction of water movement into or out of each cell. Label each picture as
having an isotonic environment, hypotonic environment, and hypertonic environment to the cell.
_______________________
________________________
_________________________
4. Each red blood cell is surrounded by a solution. Label each solution as isotonic, hypotonic, or
hypertonic (Pay attention to the movement of the water):
_____________
_____________
______________
5. Each plant cell is surrounded by a soulution. Label each solution as isotonic, hypotonic, or hypertonic
(Pay attention to the movement of the water):
______________
____________
________________
Osmosis Worksheet
For each of the following, do these things.
 Determine the solute and solvent for the solution outside the cell (environment) and for
the inside of the cell. Then…
A. Tell whether the solution outside the cell is hypotonic, hypertonic, or isotonic.
B. Give the direction of the net movement of water (into cell, out of cell, or into & out
of cell at equal rates).
C. Tell what will happen to the cell (shrink, swell, or stay the same).
20 % solute
___ % solvent
80 % solute
___ % solvent
A.
B.
1.
C.
___ % solute
10 % solvent
___ % solute
90 % solvent
A.
2.
B.
C.
40 % solute
___ % solvent
3.
30 % solute
___ % solvent
A.
B.
C.