How did Louis pasteur disprove abiogenesis theory?

It was left to the great microbiologist Louis Pasteur (1822 – 1895) to give conclusive evidence against the theory of spontaneous generation. For his experiments he used a goose necked or swan necked flask. He boiled a solution of sugar and yeast for several hours. Then the flask was left unsealed for the free exchange of air with the outside environment.

Even after several weeks there was no development of microbes in it. Because the neck of the flask was shaped in such a way as to trap the outside dust particles or microbes in the neck allowing only the air to reach the solu­tion. In this way the solution inside the flask remained germ free. By breaking the neck of the flask Pasteur reported the development of mi­crobes once again.

The experiment of Louis Pastuer clearly showed that life can arise only from a preexisting life and the abiogenetic theory of life is not correct. This means that the present life forms can only come from preexisting life. This is called the biogenetic theory.