Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 3 of 99
Malpighian tubules serve as the primary excretory structures in which of the following organisms?
A
Planaria
B
Cockroach
C
Earthworm
D
Human
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Cockroach
Concept: Comparative excretory organs in invertebrates.

Solution: Insects such as the cockroach utilize Malpighian tubules attached to their digestive tract to collect nitrogenous wastes and precipitates them as uric acid.

Why other options are incorrect:
  • Option A (Planaria): Employs protonephridia equipped with flame cells.

  • Option C (Earthworm): Uses metanephridia located in each body segment.

  • Option D (Human): Excretes waste using metanephric kidneys containing nephrons.

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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