Biology Evolution UHS 2023
PMDC Verified Question 17 of 47
Which of the following is not an example of disuse of organs?
A
Snake's legs
B
Muscle atrophy
C
Shedding of milk teeth
D
Movement of ear
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Shedding of milk teeth
Concept:

The "use and disuse" theory (Lamarckism) or the modern concept of vestigial organs refers to anatomical structures losing function over evolutionary time due to lack of environmental necessity.

Solution:

  • The shedding of milk teeth (deciduous teeth) is a programmed, physiological developmental process that occurs in all mammals to make way for permanent adult teeth.
  • It is an active developmental stage, not an evolutionary consequence of an organ being "disused" over generations.


Why other options are incorrect:

  • Snake's legs / Ear muscles: These are classic vestigial structures resulting from long-term evolutionary disuse.
  • Muscle atrophy: Results from short-term physical disuse in an individual's lifetime.

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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