Biology 9700 · AS & A Level · Movement into and out of cells

Movement into and out of cells — practice question

A student measured the mass of a cylinder of potato and then placed it in a test-tube that contained a salt solution. After one hour, the potato cylinder was taken out of the salt solution. It was blotted dry and then weighed again. The student observed that the potato had lost mass. Which row gives the correct explanation for the results the student obtained?

  • AWater potential before soaking: higher; condition after soaking: plasmolysed
  • BWater potential before soaking: higher; condition after soaking: turgid
  • CWater potential before soaking: lower; condition after soaking: plasmolysed
  • DWater potential before soaking: lower; condition after soaking: turgid

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