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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?

1. (A) is correct but (B) is false.
2. (B) is correct but (A) is false.
3. Both (A) and (B) are correct.
4. Both (A) and (B) are false.

Correct answer: Both (A) and (B) are correct.

Solution

The earliest life forms were simple, non-green, and lived before free oxygen accumulated, so they were anaerobic. The first autotrophs were chemoautotrophs, which synthesize organic compounds using chemical energy and do not release oxygen.

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