Zoology - Evolution Question with Solution | TestHub

The theory of chemical evolution was given by the Oparin of Russia and Haldane of England. This is the most acceptable theory for origin of life. They proposed that chemical evolution (inorganic constituents$\to$Formation of diverse non-living organic molecules like RNA, protein, etc.) has resulted in the formation of first life forms. Conditions on earth at that time were - High temperature, volcanic storms and reducing atmosphere containing${\mathrm{C}\mathrm{H}}_4,\mathrm{ }{\mathrm{N}\mathrm{H}}_3$, etc.

Experimental proof of the theory of chemical evolution was given by S.L. Miller (American scientist) and Harold Urey in 1953. Similar atmospheric conditions were developed on a laboratory scale - Electric discharge in a closed flask containing${\mathrm{C}\mathrm{H}}_4,\mathrm{ }{\mathrm{H}}_2,\mathrm{ }{\mathrm{N}\mathrm{H}}_{}3$and water vapour at${\mathrm{800 }}^{\mathrm{o}}\mathrm{C}$.

Result: Few amino acids were obtained.