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Heredity and Evolution — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceHeredity and Evolution3 Marks
Question
Describe any three methods of tracing evolutionary relationship amongst organisms.
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Answer

Methods of tracing evolutionary relationships.
  1. Studying homologous organs: Organs having same structural plan or origin but are modified to perform different functions.
Example: Forelimbs of vertebrates.
  1. Studying analogous organs: Organs have different structural plan or origin but are modified to perform same function.
Example: Wings of birds and wings of bat/wings of insects and wings of bat.
  1. Study of fossils: By studying fossils,we can know about the species which once existed.
Example: Dinosaur skull/Invertebrate.

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