Question

Which one of these following is not consider as result of oxygen revolution:-

• A. Atmosphere of earth changed from reducing to oxidising
• B. Formation of ozone layer
• C. Origin of anaerobic chemoheterotrophs
• D. Possibilities of anaerobic further chemical evolution finished

Answer 1

The correct option is D Possibilities of anaerobic further chemical evolution finished

• The oxygen revolution happened about 2.5 billion years ago. Then oxygen started to accumulate in the atmosphere. Oxygen is toxic to anaerobic organisms and this increase in atmospheric oxygen killed much of the life that had evolved to this point generating a huge mass extinction.
• Oxygen revolution resulted in a change of atmosphere from reducing to oxidizing, Formation of the ozone layer and origin of anaerobic chemoheterotrophs.
• Hence Possibilities of anaerobic further chemical evolution finished is not considered a result of oxygen revolution.
• So, the correct answer is 'Option D'.