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NEET Biology Evolution Of Life Question Bank Self Evaluation Test - Evolution

  • question_answer
    The atmosphere of early earth probably contained no\[{{O}_{2}}\]until the emergence of organisms that:

    A) Were chemoautotrophic.

    B) Were oxygen-respiring.

    C) Used hydrogen sulfide as a hydrogen source for photosynthesis.

    D) Used water as a hydrogen source for photosynthesis.

    Correct Answer: D

    Solution :

    [d] Around 2.5 billion years ago, during the Precambrian, oxygen began to accumulate in the atmosphere due to the action of photosynthetic cyanobacteria.


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