- Osmosis is the movement of water molecules across a selectively permeable membrane from an area of higher water concentration (lower solute concentration) to an area of lower water concentration (higher solute concentration).
- Water moves down the concentration gradient (from higher water concentration to lower water concentration).
- a. isotonic - A solution with the same solute concentration as another solution, resulting in no net movement of water.
- b. hypertonic - A solution with a higher solute concentration (and lower water concentration) than another solution.
- c. hypotonic - A solution with a lower solute concentration (and higher water concentration) than another solution.
- Cell 1 (95% water outside, 98% water inside): Arrow pointing OUT of cell. Environment colored yellow (hypotonic).
- Cell 2 (98% water outside, 98% water inside): No arrow (or equal arrows). Environment colored light blue (isotonic).
- Cell 3 (100% water outside, 98% water inside): Arrow pointing INTO cell. Environment colored light green (hypertonic).
- A. Isotonic: solution in which the solute concentration is the same; condition plant cells require; plant cell with good turgor pressure.
- B. Hypertonic: solution with a higher solute concentration; condition that animal cells require; red blood cell bursts (cytolysis); plant cell loses turgor pressure (Plasmolysis).
- C. Hypotonic: solution with a lower solute concentration; solution with a high water concentration.
- Image 1 (cell swelling): Hypotonic
- Image 2 (normal cell): Isotonic
- Image 3 (shriveled cell): Hypertonic
- Image 4 (plant cell normal): Isotonic
- Image 5 (plant cell swollen): Hypotonic
- Image 6 (plant cell plasmolyzed): Hypertonic
- Type of transport: Active Transport
- Energy used: ATP
- Direction: Against the concentration gradient (from low to high concentration)
- Internal environment of cell: Colored yellow.
- Transport proteins: Colored red and labeled.
- Substance being moved: Colored blue.
Parent Tip: Review the logic above to help your child master the concept of cell membrane and tonicity worksheet.
