Educational Osmosis & Tonicity notes and worksheet for ESL/ELL students, with a key included.

- Osmosis is the movement of water across a semipermeable membrane from an area of low solute concentration to an area of high solute concentration.
- In a hypotonic solution, water enters the cell, causing it to swell or burst.
- In a hypertonic solution, water leaves the cell, causing it to shrink or crenate.
- In an isotonic solution, there is no net movement of water; the cell maintains its normal shape.
- Freshwater plant cells placed in saltwater (hypertonic) will shrink because water moves out of the cells toward the higher solute concentration outside.
- The direction of water movement depends on the relative concentrations of solutes inside and outside the cell.