Question

Choose the most appropriate alternatives from amongst the following:

Which of the following is not a vestigeal organ?

• A. Ear pinna
• B. Nictitating membrane
• C. Vermiform appendix
• D. Caecum

Answer 1

The correct option is D

Caecum

The correct option is D.

Explanation of the correct option:

1. The first part of the large intestine is called the caecum.
2. It is very well-developed in the case of herbivorous animals and is also an essential organ for human beings.
3. The vermiform appendix develops from the caecum.
4. The vermiform appendix is vestigeal but the caecum is not.

Explanation of the incorrect options:

Option A: Ear pinna does not have any function; it just gives shape to the ear.

Option B: Nictitating membrane is a vestigeal organ for humans.

Option C: Vermiform appendix does not have any function in humans and is also extremely reduced in size; so it is a vestigeal organ.

Hence, caecum is not a vestigeal organ for human beings.