Biology Evolution UHS 2022
PMDC Verified Question 37 of 47
For evolutionary process to occur, which of the following is not a geographical barrier?
A
Ocean
B
River
C
Atmosphere
D
Mountains
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Atmosphere
Concept:

Geographical isolation (allopatric speciation) requires physical barriers that prevent the free movement and interbreeding of terrestrial or aquatic populations.

Solution:

  • A geographical barrier is a physical landscape feature that separates populations, cutting off gene flow.
  • Oceans, Rivers, and Mountains are classic examples of physical land/water barriers that restrict organism movement.
  • The Atmosphere is a continuous gaseous envelope surrounding the Earth. It does not act as a physical geographical boundary that divides surface-dwelling populations into isolated groups.


Why other options are incorrect:

  • Oceans, rivers, and mountains directly block physical migration and lead to reproductive isolation.

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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