Contribution of scientist : Louis Pasteur $($ in $1860)$, Oparin and Haldane.
Rejected the theory of spontaneous generation and domstrated that life came from pre existing life.
$\Rightarrow$ Theory of chemical evolution was given them. According them the first form of life came from pre existing non-living organic molecule and chemical evolution was followed by formation of life.
$A$ : Theory of biogenesis explains that life arises from pre-existing life.
$R$ : Louis Pasteur finally disapproved the theory of spontaneous generation of life.
An experiment to prove that organic compounds were the basis of life, was performed by
Following are the two statements regarding the origin of life.
$(A)$ The earliest organisms that appeared on the earth were nongreen 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?
Assertion : The primitive atmosphere was reducing one i.e., without oxygen.
Reason : In the primitive atmosphere, oxygen was involved in forming ozone