1. Plant Cell Osmosis Lab
Mrs. Stewart
Biology

2. Bell Work
Pick up Plant Cell Osmosis Lab Packet – ONE for each set of shoulder partners

3. Objectives
Predict the movement of water when a cell is placed in environments with varying solute concentrations
Recognize the importance of homeostasis as a survival mechanism

4. Background Hypotonic solution Hypertonic solution Isotonic Solution
Water moves into the cell
Hypertonic solution
Water moves out of the cell
Isotonic Solution
Water is moving at equilibrium

5. Vocabulary
Turgid = swollen/distended with water (occurs in a hypotonic solution)
Turgor Pressure = pressure exerted on a cell wall due to the cell becoming turgid.
Plasmolysis = the shrinking of the cytoplasm due to loss of water in a hypertonic solution. Cell membraned pulls away from cell wall

6. Step One: Draw ONE onion cell
Draw how much purple fills the cell

7. Tap Water: ONE onion cell
Draw how much purple fills the cell now
Did it change?

8. Plasmolysis in Salt Water
Draw how much purple fills the cell now.
What happened?

9. Turgor Pressure in Distilled Water
Draw how much purple fills the cell now.
What happened?

10. Analysis Questions:
Complete questions 1 – 7
20 minutes