TASC Biology Level 3 Practice Questions - TASC Biology Level 3 (Course Code BIO315124) Exam

When a plant cell is placed in a hypertonic extracellular solution, what observed cellular response occurs?

Water exits the cell by osmosis, causing the central vacuole to shrink and the plasma membrane to pull away from the cell wall (plasmolysis). Water enters the cell rapidly by osmosis, causing the cell membrane to rupture (cytolysis). Solutes are actively pumped out of the cell until the intracellular fluid becomes hypertonic. The cell wall expands to absorb excess water, increasing cell turgor pressure.

Correct Answer:

Water exits the cell by osmosis, causing the central vacuole to shrink and the plasma membrane to pull away from the cell wall (plasmolysis).

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