Question

Which event of organic evolution was a turning point that changed the nature of atmosphere of primitive earth?

Answer 1

formation of diverse organic molecules from inorganic constituents. The conditions on earth were – high temperature, volcanic storms, reducing atmosphere containing CH4 , NH3 etc

Answer 2

Solution:

The oxygenic photosynthesis event of organic evolution was a turning point that changed the nature of the atmosphere of the primitive earth.

Explanation:

• According to chemogeny explained by the Oparin and Haldane, broth formation occurs in which ammonia, carbon dioxide, methane, dihydrogen, and water vapor were found. From this broth, organic molecule formation occurs then complex biomolecules were formed such as DNA, RNA, and protein. All substances aggregated to form protobiont then coacervates.
• Further chemoheterotrophs and chemoautorophs formation occur and then aerobic organism formed.
• This oxygenic photosynthesis was the turning point that change the nature of the atmosphere of the primitive earth.