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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
What is geological time scale? How is it divided ?
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Answer

  1. Geological time scale is the arrangement of major divisions of geological time into eras, periods and epochs on the time scale.
  2. This division is based on the study of fossilized organisms obtained from the different strata of the earth.
  3. The characteristic significant events that occurred in the organization of organisms helped the geologists to understand the geological time scale.
  4. The major divisions of geological time are called eras.
  5. The eras are divided into periods and the periods into epochs.
  6. By studying fossils in the earth crust, the evolutionary changes in the organisms have been traced out.

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