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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

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B

1, 2 and 4

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C

1, 2, 3 and 4

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D

1 and 2

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Solution

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 though perform similar function do not have the same common origin as the other organs listed and hence is not homologous to them. They are instead analogous organs.


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