IMP Questions Of chapter

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Q.1 Describe the Oparin-Haldane theory of Chemical Evolution

ANS - The russian scientist Alexender Oparin (1924) and British scientist J.B.S.Haladane (1929) proposed the theory of chemical evolution of life .

A) Origin of the earth and its primitive atmosphere :-

The origin of life on earth is closely related origin earth itself. Evidences suggest that earth originated about billion years ago. When it was broken from Sun, it was a glowing fire and a rotating cloud of the hot gases, vapours of various elements, pieces of rocks and metals called Nebulous.

B) Formation of the Ammonia,water and methane :-

The earth was very hot initially and so the atoms could not combine with each other very easily. The primitive earth contained large amount of hydrogen, nitrogen,oxygen and carbon. Of these, hydrogen was very active It combined with nitrogen to form ammonia(NH3), with oxygen to form water (H2O), and carbon to form methane (CH4). As the temperature high, ammonia and methane remained as gases and water as steam.

C) Synthesis of simple organic compound :-