Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 18 of 99
Almost all freshwater animals and the vast majority of marine vertebrates maintain internal osmolarity distinct from their surroundings, classifying them as:
A
Osmoregulators
B
Osmoconformers
C
Isotonic conformers
D
Thermal conformers
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Osmoregulators
Concept: Physiological osmoregulation vs. osmoconformity.

Solution: Osmoregulators actively expenditure energy to maintain an internal blood osmotic concentration that differs from the osmolarity of their external environment.

Why other options are incorrect:
  • Option B & Option C: Osmoconformers maintain internal fluids iso-osmotic with their environment (e.g., marine invertebrates).

  • Option D: Thermal conformers allow internal temperature to mirror ambient temperature.

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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