GK
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Effect of solar radiation on chemicals
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Interaction of water, air and clay under intense heat
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Possible origin of life by combination of chemicals under suitable environmental conditions
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Crystallization of chemicals
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Detailed explanation-1: -Explanation: The concept of chemical evolution refers to the origin of life from non-living matter. According to the available evidence of origin and evolution of life, chemical substances reacted at random to form chemical compounds which then aggregated to form components of biological entities.
Detailed explanation-2: –Chemical evolution means the origin of life from nonliving matter by the sequence of chemical reactions. Chemical evolution is also called abiogenesis.
Detailed explanation-3: -This theory states that early environment was rich in ammonia, water vapour, methane etc. Oxygen was lacking in the environment. It is believed that the UV rays from sun helped in the synthesis of an organic molecule. Thus the correct option is D.
Detailed explanation-4: -Miller and Urey first conducted an experiment on evolution to prove the biochemical origin of life. Based on the hypothesis proposed by Oparin and Haldane, they provided an experimental evidence of the chemical evolution in 1953 in a laboratory set-up.