Question

Which is not a vestigial organ in man?

• A. Nictitating membrane
• B. Tail vertebrae
• C. Vermiform appendix
• D. Nails

Answer 1

Answer: (D)

Nails

Vestigial organs are those organs which are present in reduced form and do not perform any function in the body but correspond to the fully developed functional organs of related animals. These organs are believed to be remnants of organs which were complete and functional in their ancestors. in man, nails are not vertigial organs. Human body has been described to possess about $90$ vestigial organs such as nictitating membrane, vermiform appendix, caudal vertebrae (coccyx or tail bone), third molars, etc. Vestigial organs in animals include wings of flightless birds such as kiwi, ostrich, etc., and pelvic girdles of pythons, etc.

So, the correct answer is 'Nails'.