Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 92 of 99
Osmotic water movement across a semipermeable membrane toward a region of higher solute concentration is driven by a difference in:
A
Pressure potential
B
Matrix potential
C
Solute potential
D
Gravitational potential
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Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Solute potential
Concept: Water potential components.

Solution: Solutes lower the water potential of a solution. This component is defined as solute potential (\(\Psi_s\)). Water moves passively from higher (less negative) to lower (more negative) solute potential.

Why other options are incorrect:
  • Option A (Pressure potential): Represents physical hydrostatic pressure exerted on water (e.g., turgor).

  • Option B (Matrix potential): Represents water adhesion to insoluble surfaces (e.g., soil/cell walls).

  • Option D: Represents the effect of gravity on water.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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