Question

Which of the following is a vestigial organ in the human body?
A. Eyelid
B. Eyelash
C. Caecum
D. Appendix

Answer 1

Hint: Vestigial organs are popularly known to be remnants of organs which were complete as well as were functional earlier in our ancestral species but lost its function with period of time and became reduced during the course of evolution.

Complete answer:
Vermiform Appendix is a vestigial organ which is connected to the
cecum of the large intestine which has lost its functions within a period of time. But in our ancestral forms it served the function of digesting leaves and some various other functions also. The vermiform appendix is also known as vermix or the cecal appendix. Caecum appears to be pouched like a structure. It is a blind ended tube which is connected to the cecum, at the junction of the large and small intestine. The appendix is usually present in the right lower quadrant of the abdomen, closely to the
right hip bone.

Hence, the correct option is option D i.e. Appendix.

Additional information: Appendicitis , nowadays a very common medical procedure that is related with inflammation of appendix. Based on the evolutionary evidence till now, scientists suggested that the vermiform appendix was used as an organ for digesting cellulose in plant foods and foliages. Vermiform appendix in humans was thought to work exactly like cecum which is presently found in herbivores for digesting plant leaves and cellulose present in them using bacteria residing inside it.

Note:
Some of the other very known examples of vestigial organs include rudimentary jaws of reptiles, vermiform appendix in humans, etc.
Two vestigial organs found in humans: Tail bone (coccyx) and vermiform appendix.