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Name: ______________________________
Period: _____________ Date: _________
Osmosis & Diffusion Practice Worksheet
1a. Where is the highest water concentration? ________________________________
1b. Where is the lowest water concentration? ________________________________
1c. Where is the lowest salt concentration? __________________________________
1d. Where is the highest salt concentration? __________________________________
1e. Which direction would the water move because of osmosis? __________________
2. Use arrows to indicate the direction of diffusion in each case:
through the cell membrane.
is a cell membrane.
is a molecule that can pass
3. 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
Name: ______________________________
Period: _____________ Date: _________
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?
8a. Is the solution outside of the cell hypertonic or hypotonic? ______________________
8b. Which direction will the water move due to osmosis? __________________________
9a. What type of solution is outside of the cell? _____________________________
9b. Which direction will the water move due to osmosis? __________________________
9c. Will the cell shrink or swell? ___________________________________