Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 54 of 99
A high turgor pressure in plant cells is maintained primarily by which of the following vacuolar conditions?
A
Low vacuolar solute concentration
B
Higher osmotic pressure of the vacuolar sap and elevated ionic concentration inside the vacuole
C
Reduced cell wall mechanical elasticity
D
Active efflux of water out of the vacuole
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Higher osmotic pressure of the vacuolar sap and elevated ionic concentration inside the vacuole
Concept: Mechanism of plant turgor pressure.

Solution: Plant cells actively accumulate inorganic ions and organic solutes inside the central vacuole. This generates a high vacuolar osmotic pressure (hypertonic sap), driving inward osmotically generated water movement that presses the plasma membrane firmly against the rigid cell wall.

Why other options are incorrect:
  • Option A & Option D: Low solute concentration or water efflux would decrease turgor pressure, leading to cell plasmolysis.

  • Option C: Rigid cell walls allow high turgor pressure to build without bursting, but cell wall elasticity itself does not drive inward osmotic water uptake.

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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