Biology Evolution ETEA 2023
PMDC Verified Question 24 of 47
All of the following paired organs/structures have homology except:
A
Human hand: Bat's wing
B
Bat's wing: Wings of butterfly
C
Horse front leg: Front flappers of whale
D
Wings of bird: wings of flying lizards
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Bat's wing: Wings of butterfly
Concept:

Homologous structures arise from shared ancestry, while analogous structures arise from convergent evolution due to similar functional demands.

Solution:

  • Homology implies a shared embryonic origin and underlying bone structure (e.g., the pentadactyl limb).
  • A Bat's wing (mammalian bone structure) and the Wings of a butterfly (insect chitin structure) do not share a common ancestral origin.
  • They only share a function (flight), making them purely analogous structures, not homologous.


Why other options are incorrect:

  • Human hand & Bat wing / Horse leg & Whale flipper / Bird wing & Lizard wing: All these pairs represent tetrapod forelimbs derived from a common reptilian/amphibian ancestor, thus they are homologous.

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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