Absence of oxygen in earth, made the atmosphere reducing. But it later became oxidizing in nature due to the emergence of ________(a) Angiosperms(b) Gymnosperms(c) Eukaryotic algae(d) CyanobacteriaThe question was posed to me in an interview.Asked question is from Evolution topic in section Evolution of Biology – Class 12

Absence of oxygen in earth, made the atmosphere reducing. But it later

1.	Absence of oxygen in earth, made the atmosphere reducing. But it later became oxidizing in nature due to the emergence of ________(a) Angiosperms(b) Gymnosperms(c) Eukaryotic algae(d) CyanobacteriaThe question was posed to me in an interview.Asked question is from Evolution topic in section Evolution of Biology – Class 12
Answer» The correct CHOICE is (d) CYANOBACTERIA Explanation: The primitive ATMOSPHERE had no oxygen and reducing i.e. no free oxygen was available. It was converted into oxidizing NATURE by the emergence of cyanobacteria. They released oxygen into atmosphere by converting water into hydrogen and oxygen.

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