Which of the following was most likely to hav | vedclass

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(A) The primordial atmosphere of the Earth was reducing in nature.It contained gases like $CH_4$,$NH_3$,$H_2$,and water vapor.Free oxygen $(O_2)$ was

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$O_2$

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(A) The primordial atmosphere of the Earth was reducing in nature.It contained gases like $CH_4$,$NH_3$,$H_2$,and water vapor.Free oxygen $(O_2)$ was absent because it was highly reactive and would have immediately combined with other elements to form oxides.Oxygen was later released into the atmosphere by photosynthetic organisms (cyanobacteria) during the process of oxygenic photosynthesis.

Column-$I$	Column-$II$
$P$. Origin of Earth	$I$. $4500 \, mya$
$Q$. Origin of Life	$II$. $4000 \, mya$
$R$. Origin of first cellular life	$III$. $3000 \, mya$
$S$. Origin of first non-cellular life	$IV$. $2000 \, mya$

Which of the following was most likely to have been absent in free form in the primordial atmosphere at the time of the origin of life?

Similar Questions

The scientist associated with the theory of biogenesis and experiments with swan-necked flasks is

Match the following columns:
Column-$I$ Column-$II$
$P$. Origin of Earth $I$. $4500 \, mya$
$Q$. Origin of Life $II$. $4000 \, mya$
$R$. Origin of first cellular life $III$. $3000 \, mya$
$S$. Origin of first non-cellular life $IV$. $2000 \, mya$

Louis Pasteur successfully rejected the theory of spontaneous generation because:

How many years ago did abiogenesis occur?

How was the oxygen in the atmosphere produced?

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