Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 88 of 99
Direct excretion of toxic ammonia without prior conversion to urea or uric acid (ammonotelism) is characteristic of:
A
Terrestrial reptiles
B
Mammals
C
Aquatic bony fishes
D
Birds
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Aquatic bony fishes
Concept: Ammonotelism in aquatic organisms.

Solution: Aquatic bony fishes are ammonotelic. Because water is abundant, they easily flush out highly soluble, toxic ammonia across their gill membranes.

Why other options are incorrect:
  • Option A & Option D: Terrestrial reptiles and birds are uricotelic (excrete uric acid to conserve water).

  • Option B: Mammals are ureotelic (excrete urea).

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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