. Assertion:The earliest organisms that appeared on the earth were non-green and presumably anaerobes

Reason :The first autotrophic organisms were the chemo-autotrophs that never released oxygen.


Best Answer

Ans || (b)

Solution ||| Primitive earth was devoid of oxygen so, only those organisms that were able to survive within anaerobic conditions developed. All those were heterotrophic organisms (taking nutrients from outside). Then after autotrophic organisms were developed that used inorganic sources such as H2S, NH3, CH4 as the principle sources of energy. These organisms are called chemo-autotrophs

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