Which scientist showed that organisms do not grow spontaneously in beef broth?

Louis Pasteur

Explanation:

Louis Pasteur designed an  experiment in which he proved that life cannot generate or grow spontaneously. It needs some base for taking birth or rebirth.

For instance, in his experiments the flasks that were exposed to the dust have generated cloudy solution but the flask that were unbroken did not show any such sign. Thus , he proved that microbes appeared in broken flask because of the presence of dust.

Hence he showed that that organisms do not grow spontaneously in beef broth