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Question
Which one of these is likely to have been absent in free form at the time of origin of life?
Which one of these is likely to have been absent in free form at the time of origin of life?
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Solution
The correct option is B Oxygen
The primitive atmosphere of earth was reducing atmosphere with no oxygen but was rich in water vapour, carbon monoxide, carbon dioxide, nitrogen and hydrogen. Owing to immense long lasting rainstorms, a tremendous amount of lightening was generated. Lightening provided energy for chemical reactions between hydrogen and nitrogen and carbon to form ammonia and methane. So, the correct answer is option A.
The primitive atmosphere of earth was reducing atmosphere with no oxygen but was rich in water vapour, carbon monoxide, carbon dioxide, nitrogen and hydrogen. Owing to immense long lasting rainstorms, a tremendous amount of lightening was generated. Lightening provided energy for chemical reactions between hydrogen and nitrogen and carbon to form ammonia and methane. So, the correct answer is option A.
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