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Origin and Evolution of Life — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYOrigin and Evolution of Life4 Marks
Question
Distinguish between: Homologous organs and Analogous organs.
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Answer

Homologous organsAnalogous organs
1. Homologous organs are structurally similar to one another.1. Analogous organs are structurally dissimilar to one another.
2. Homologous organs are functionally dissimilar from one another.2. Analogous organs are functionally similar to one another.
3. Homologous organs help in tracing the evolutionary relationships.3. Analogous organs do not help in tracing the evolutionary relationships.
4. Homologous organs lead to divergent evolution.4. Analogous organs lead to convergent evolution.
5. Animals residing in different habitats but having closer evolutionary relationship show homologous organs.E.g. Forelimbs of frog, lizard, bird, bat, whale, man, etc.5. Diverse animals residing in the similar habitat show analogous organs.E.g. Wing of a bird and wing of an insect.

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