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Explain the Occurrence of Vestigial Organs on the Basis of Lamarck'S Theory of Use and Disuse. - Biology

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Short Note

Explain the occurrence of vestigial organs on the basis of Lamarck's theory of use and disuse.

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Organs which are found in reduced or rudimentary condition and do not perform any function in the possessor are called vestigial organs or non-functional organs. They help in understanding the history of evolution and continuity of life.


  1. Wisdom teeth: They are the last molars which appear last at the age of 17-20 years.


  1. Vermiform appendix: It projects from the blind end of the caecum and is a functionless organ in humans. It is helpful in herbivorous mammals.


  1. Pinna: It is the lobe-like part of the external ear which humans cannot move as in other mammals. As it is poorly developed, it is a vestigial organ.
Concept: Lamarck’S Theory
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Selina Concise Biology Class 10 Icse
Chapter 14 Human Evolution
Long answer type | Q 6 | Page 193
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