Two pre sterilised flasks with ** yeast, one sealed, other open to air, differential growth of life in two flasks/life was found only in open flask.
The following diagram can be considered in lieu of above explanation life comes from pre-existing life (it came from air entering the flask)/proved the theory of biogenesis.
Detailed Answer:
Experiment of Louis Pasteur :
(i) He took two pre-strerlised flasks containing nutrient broth ** Yeast.
(ii) One flask was left open and the other was sealed.
(iii) After sometime, the flask which was left open showed new live organisms while in air tight flask no new life originated.
(iv) Appearance of life even after sterilisation concluded that life in the flask arose form pre-existing life, thus it discarded the theory of spontaneous origin of life.
