Question

Consider the following examples:

1. Wings of a bat.

2. Flippers of a whale.

3. Wings of a butterfly.

4. Limbs of a human.

Which of the following are homologous organs?

• A. 1, 2 and 3
• B. 1, 2 and 4
• C. 1, 2, 3 and 4
• D. 1 and 2

Answer 1

The correct option is B 1, 2 and 4

Homologous organs are those that have similar internal structure but perform different functions. Wings of a bat, flippers of whale and limbs of human beings are all homologous to each other as they have a common origin, hence similar internal structure (bones that comprise them). On the other hand, wings of a butterfly perform a similar function but do not have the same common origin as the other organs listed and hence is not homologous to them. They are analogous organs.