Discussion
According to Oparin, which of the following was not present in the primitive atmosphere of the earth ?
Answer: D
The component absent from Oparin's primitive atmosphere is oxygen.
Oparin, and Haldane independently, proposed that the early earth had a reducing atmosphere of methane, ammonia, hydrogen and water vapour, with no free oxygen. That absence mattered: free oxygen would have oxidised and broken down the organic molecules formed by lightning and ultraviolet radiation, so they could not have accumulated into a 'primordial soup'.
Methane, hydrogen and water are all part of the proposed mixture, and the same gases were used in the Miller-Urey experiment of 1953 that tested the idea. Free oxygen appeared only later, from photosynthesis by cyanobacteria.
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