Describe the Stanley Miller experiment and Uray experiment with the help of labelled diagram?
Miller and Urey used a specially designed apparatus in which they recreated early earth conditions. It was a chemical experiment to give evidence to chemical origin of life. Miller-Urey experiment proved that putative conditions on the early earth favoured chemical reactions that synthesised more complex organic compounds from simpler inorganic precursors.
Spontaneous generation held that living creatures can arise from non living matter. For example, maggots can arise from dead flesh. It was disapproved later by Louis Pasteur and other scientists.
More to Know:
Miller and Urey 's experiment is considered to be the classic experiment on the origin of life. The experiment used water (H2O), methane (CH4), ammonia (NH3) and hydrogen (H2) materials which were believed to represent the major components of the early Earth's atmosphere
Miller and Urey created conditions similar to the primitive atmosphere in the laboratory using glass apparatus and tubes. They created electric discharge using electrodes in a closed flask containing methane, ammonia, hydrogen and water vapour at 800 degree C. The water containing chamber was heated to provide water vapour. After a week, they observed the formation of a number of complex organic molecules like sugars, lipids, amino acids and nitrogen bases. Analysis of meteorites also revealed the presence of similar compounds, indicating the occurrence of similar processes elsewhere in the space. The chemical evolution of life was more or less accepted.