Theory of Abiogenesis deals with the theory of spontaneous generation; stating that living things originated from non-living things. Aristotle (384-322 BC): The founder of a theory spontaneous generation. He observed spontaneous existence of fishes from dried ponds, when the pond was filled with rain. Francesco Redi (1626-1697): He is the scientist who first tried to set an experiment to disprove spontaneous generation.
He put the meat in a bottle and covered it with a gauze.
He observed that the flies laid eggs from which the maggots developed.
He said maggots did not developed from meat but from flies egg.
Theory of Biogenesis states that life comes from pre-existing life. Louis Pasteur (1822-1895 GC) was the scientist who disproved the theory of abiogenesis. He designed a large curved flask (Pasteur goose neck flask) and placed a sterile growth broth medium. Air freely moved through the tube; but dust particles were trapped in the curved portion of flask. Microbial growth in the broth was not seen. Therefore Pasteur proved that micro-organisms entered to substrates through the air and micro-organisms did not evolve spontaneously.
Major contribution of Louis Pasteur
Microbial theory of fermentation
Principles and practice of sterilization and pasteurization