Basque PAU Biology Practice Questions - Basque Country PAU Biology Examination - UPV EHU (2o Bachillerato 2026) Exam

What happens to a plant cell when it is placed into a hypertonic salt solution?

Water enters the vacuole causing the cell to burst via osmotic lysis. Sodium ions enter the cell via simple diffusion until turgor pressure stabilizes. Water leaves the central vacuole causing the plasma membrane to detach from the cell wall (plasmolysis). Solute equilibrium is maintained with no net movement of water across the membrane.

Correct Answer:

Water leaves the central vacuole causing the plasma membrane to detach from the cell wall (plasmolysis).

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