NEETZoologyEvolution
What did Oparin and Haldane propose about the origin of the first life forms?
Options
- AThey originated from non-living organic molecules
- BThey were created by spontaneous generation
- CThey came from extraterrestrial sources
- DThey evolved directly from existing life forms
Correct answer
A. They originated from non-living organic molecules
Step-by-step solution
Oparin of Russia and Haldane of England proposed that the first form of life could have come from pre-existing non-living organic molecules (e.g. RNA, protein, etc.) and that formation of life was preceded by chemical evolution, i.e., formation of diverse organic molecules from inorganic constituents. The conditions on earth were – high temperature, volcanic storms, reducing atmosphere containing CH4 , NH3 , etc. In 1953, S.L. Miller, an American scientist created similar conditions in a laboratory scale. He create