Osmosis Equilibrium in Potato Cells

Steps:

• Observe no size change after 30 minutes, indicating no net water movement.
• Recall osmosis: water moves from high to low water potential until equilibrium.
• Conclude water potentials are equal, as unequal potentials would cause size change.
• Rule out concentration differences, as they drive potential gradients.

Why D is correct:

• Water potential equality prevents net osmosis, per the principle that water moves down potential gradients until balanced.

Why the others are wrong:

• A: Claims unequal water concentration, which would cause movement and size change.
• B: Focuses on water concentration equality but ignores potential; incomplete for no movement.
• C: Suggests higher potential outside, which would draw water in and increase size.

Final answer: D