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Evolution — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYEvolution2 Marks
Question
What is meant by homologous organ? Taking suitable example, explain how they support the theory of organic evolution.
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Answer

The organs which have same basic structural design and development origin but differ in their uses and functions are called homologous organs. The forelimbs of some animals have similar anatomical structure. They possess humerus, radius, ulna, carpals, metacarpals and phalanges in their forelimbs, e.g., forelimbs of man, whales, bats, cheetah, indicates that they have common ancestors, thus supporting organic evolution.

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