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Question

Which of the following sets contain only homologous organs?
  1. Vermiform appendix, body hair  and patella
  2. Whale's flipper, horse's forelimb, human hand 
  3. Wings of butterfly, crow and insect 
  4. Horse's forelimb, insect wing, human hand 


Solution

The correct option is B Whale's flipper, horse's forelimb, human hand 
The structures which are similar in their morphology, anatomy, genetics, and embryology but dissimilar in their functions are called homologous structures.
These structures are inherited from a common ancestor, have a similar developmental pattern in the embryos, and have the same type of bones, blood vessels, nerves, muscles etc, but have dissimilar functions in different animals. For example, Whale's flipper, horse's forelimb, human hand.

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