Tonicity and Osmoregulation

AP Biology· difficulty 3/5

membrane Side A: 0.1 M solute Side B: 0.5 M solute water

Through the semipermeable membrane shown, water moves from Side A to Side B. This is because:

  • A

    Water always moves to the hot side

  • B

    Solute crosses from B to A and water follows actively

  • C

    Side B has a lower water concentration, so it pulls water by gravity

  • D

    Side A has a higher water (lower solute) potential, so water flows down its potential to Side B

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Explanation

Water moves down its own potential gradient toward the more concentrated solute side (B), where water potential is more negative.

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