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A plant cell placed in a hypertonic solution becomes

  • A.unchanged, because the wall prevents any water loss
  • B.plasmolysed, with the membrane pulling away from the wall
  • C.turgid, with the membrane pressed firmly against the wall
  • D.lysed, with the wall itself bursting outward

Answer: B

Water leaves the vacuole and the protoplast shrinks away from the rigid wall. The wall itself does not prevent water movement at all, since it is freely permeable to water and small solutes alike. Only the plasma membrane controls what crosses.

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