Biology
Grade-8
Easy

Question

Which of the following elements were not found in free form during the origin of life?

  1. Methane
  2. Ammonia
  3. Hydrogen
  4. Oxygen

Hint:

The oxygen was not present in free form during formation of earth

The correct answer is: Oxygen


    • Atmospheric of the primitive earth was reducing because the hydrogen atoms was most numerous and most reactive 
    • Large quantity of water  ammonia,  nitrogen,  methane were present 
    • Free oxygen was not present. Hence oxygen was absent during the formation of earth

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