Question:

Which one is not a vestigial organ in man?

Updated On: Jun 7, 2022
  • Vermiform appendix
  • Plica semilunaris
  • Ear muscles
  • Epiglottis
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The Correct Option is D

Solution and Explanation

Vestigial organs are those which occur in reduced form and are useless to the possessor, but are homologous to the fully developed, functional organs of related animals. Their existence is explained by the doctrine of evolution. These organs were fully developed, functional and necessary in the ancestral forms, but are gradually disappearing in the living forms due to the change in their mode of life.
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Concepts Used:

Evolution

Evolution is a process that occurs in changes in the genetic content of a population over time. Evolutionary change is generally classified into two: microevolution and macroevolution. The process of changes in allele frequencies in a population over time is a microevolutionary process. Three main mechanisms that cause allele frequency change are natural selection, genetic drift, and gene flow. On the other hand, macroevolution refers to change at or above the level of the species.