Question

Define Vestigial Organs. Write Names of Some Vestigial Organs in Human Body and Write the Names of Those Animals in Whom Same Organs Are Functional

Answer 1

Vestigiality is the retention during the process of evolution of genetically determined structures or attributes that have lost some or all of the ancestral function in a given species. Assessment of the vestigiality must generally rely on comparison with homologous features in related species.

Answer 2

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The examples of vestigial organs - Wisdom teeth, vermiform appendix, ear muscles, coccyx, caecum, nictitating membrane etc. in human are the examples of vestigial organs.

• (1) Vestigial organs are degenerated or underdeveloped organs of organisms which do not perform any function.
• (2) According to the principle of natural selection, such organs are on the verge of disappearance. But it takes many millions of years for its complete vanishing.
• (3) The vestigial organs in one animal may be of use but to other kind of the animal as they still perform regular functions.
• (4) Appendix is vestigial for humans, it does not perform any function but in ruminant animals it is concerned with digestion.
• (5) Ear muscles are vestigial for us but in monkeys and cattle they are functional.

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