question_answer 27)

  In 1953 SL Miller created primitive earth conditions in the laboratory and gave experimental evidence for origin of first form of life from pre-existing non-living organic molecules. The primitive earth conditions created include (a) low temperature, volcanic storms, atmosphere rich in oxygen (b) low temperature, volcanic storms, reducing atmosphere (c) high temperature, volcanic storms, non-reducing atmosphere (d) high temperature, volcanic storms, reducing atmosphere containing CH4, NH3etc.

Answer:

                  (d) The Miller - Urey experiment tested for the occurrence of chemical evolution by stimulating hypothetical conditions present on early earth. These primitive earth conditions include high temperature, volcanic storms and reducing environment containing methane (), ammonia (), hydrogen () and water (). They ultimately found that a large number of simple organic compounds including some amino acids such as alanine, glycine and aspartic acid can be synthesized in into as during chemical origin of life.