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Question
Which of the following gases has not been hypothesized to have been present in Earth's atmosphere at the time when life began?
Which of the following gases has not been hypothesized to have been present in Earth's atmosphere at the time when life began?
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Solution
The correct option is D Oxygen
The primitive atmosphere of earth was reducing atmosphere with little or no oxygen but was rich in water vapour, carbon monoxide, carbon dioxide, nitrogen and hydrogen. The UV and gamma radiations from the sun were the major source of energy for chemogenesis as these radiations have energy quanta that can release electrons from atoms resulting in the formation of highly reactive free radicals which in turn combined to form early organic compounds. Thus the correct answer is option D.
The primitive atmosphere of earth was reducing atmosphere with little or no oxygen but was rich in water vapour, carbon monoxide, carbon dioxide, nitrogen and hydrogen. The UV and gamma radiations from the sun were the major source of energy for chemogenesis as these radiations have energy quanta that can release electrons from atoms resulting in the formation of highly reactive free radicals which in turn combined to form early organic compounds. Thus the correct answer is option D.
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