Tonicity and Osmoregulation

AP Biology· difficulty 2/5

Potato cores of equal mass were submerged in sucrose solutions of 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0 M for 24 hours. The percent change in mass was recorded.

[Sucrose] (M) % mass change 0.0 0.4 0.8 +15 0 -20

Approximately what is the molarity of the potato cytoplasm?

  • A

    About 1.0 M

  • B

    About 0.8 M

  • C

    About 0.3 M

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  • D

    About 0.0 M

Explanation

The line crosses zero percent mass change near 0.3 M, the isotonic point where water flux is balanced.

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