Following are the two statements regarding the origin of life.(A) The earliest organisms that appeared on the earth were non-green and presumably anaerobes.(B) The first autotrophic organisms were the chemoautotrophs that never released oxygen.Of the above statements which one of the following options is correct?

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Both (A) and (B) are correct.

Both (A) and (B) are false

(A) is correct but (B) is false

(B) is correct but (A) is false.

answer is A.

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Detailed Solution

The earliest organisms that appeared on the earth were non-green and presumably anaerobes. The first autotrophic organisms were the chemoautotrophs that never released oxygen.The primitive atmosphere was reducing. There was no oxygen. So first-ever organisms should have the ability to sustain in anaerobic conditions. Although autotrophs developed later, their energy source was inorganic components like H2S, NH3, CH4 etc. So, they are referred to as chemoautotrophs.

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