Question

Which one of the following organs have no evolutionary significance?

• A. Analogous organs
• B. Atavistic organs
• C. Non-functional organs
• D. Functional organs

Answer 1

Answer: (D)

Functional organs

Analogous organs are those organs which have the same evolutionary origin but differ in their functions. For example, the arm of the human, the wing of the bat, leg of the dog, flippers of dolphin, etc. Atavistic organs are those organs which reappeared now that had disappeared generations before. It is an evolutionary throwback. For example, hind legs on whales or snakes. Vestigial or nonfunctional organs are those organs which do not have any functions now but were functional in ancestors. Hence, these organs are of evolutionary significance. The human appendix is a very common example of nonfunctional organs.

Thus, the correct answer is option D.