Apentix/AP Biology/Unit 2: Cell Structure and Function/Question
AP Biologymediummcq1 pt

A plant cell sits in an open beaker of solution. The cell's water potential is -0.6 MPa and the surrounding solution's water potential is -0.3 MPa. Which net water movement occurs, and why?

A.Out of the cell, because dissolved solutes always pull water outward
B.Into the cell, because water flows toward the lower, more negative water potential
C.No net movement, because both values lie below that of pure water
D.Alternating in and out, because the values straddle an equilibrium point

Explanation

Core Concept

Water moves from higher to lower water potential, and more negative values mark lower potential relative to pure water at zero. The bath at -0.3 MPa sits above the cell at -0.6 MPa, so water diffuses inward across the membrane. Entry continues until the cell's potential rises to match the solution, whether through swelling pressure or solute dilution.

Correct Answer

BInto the cell, because water flows toward the lower, more negative water potential

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