Lesson 5: Tonicity & Osmoregulation
Duration of Days: 3
Lesson Objective
Calculate total water potential using solute potential and pressure potential data to mathematically predict the net direction of water movement across a semi-permeable membrane.
A plant cell is placed into an open beaker of 0.5M sucrose solution. If the cell's internal solute potential is lower than the surrounding solution, which direction will water flow?
Why are freshwater unicellular organisms (like a Paramecium) dependent on contractile vacuoles, while marine organisms rarely require them?
2.7-Tonicity & Osmoregulation
Cells must regulate water balance to prevent structural collapse or lysis.
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Unit 2 Test