Question

Which one is not as a vestigial organ in a man?
A. Vermiform appendix
B. Plica semilunaris
C. Ear muscles
D. Epiglottis

Answer 1

Hint: Vestigial organs are those organs which are not in use currently but in ancestors that organs are in use for specific functions. Vestigial organs are called useless body parts and he lost their functions but they provide an evolutionary history of particular species.

Complete answer: Charles Darwin who is known as the father evolutionary biology listed the number of vestigial features and termed rudimentary. They are functioning during the primitive time but now they are lost their function.
The vermiform appendix is the small muscular gland that presents on the ascending colon of the large intestine while, this muscular gland function in humans ancestor to secretes cellulose enzyme to digest the cellulose-rich food, now human eat cooked food to make easy digestion process and add non-veg in the diet. So that this organ is now useless.
-Plica semilunaris is the third eyelid in humans that if folded conjunctiva at the inner cornea of the human which is similar to the nictitating membrane, that is reduced in structure now but during the primitive time it protects the eyes. but now there is no use.
-Ear muscles are the external ear muscle is cartilaginous in nature and they are vestigial in nature there is no use.
-Epiglottis is the important structure present over the glottis on the windpipe, it is a leaf-like structure located behind the tongue and at the top of the voice box, it functions to cover the windpipe during eating.
Hence, the correct answer is Option D.

Note: The vestigial organs are used to identify the evolutionary history and study of the evolution process. Some vestigial organs may act as the connecting link between different species and establish a relation between them.