Question

The scientist related to the theory of spontaneous generation and experiments with swan- neck flasks is
(a)Van Helmont
(b)Louis Pasteur
(c)Miller
(d)Haeckel

Answer 1

He is a French botanist, chemist, and microbiologist. He was well known for his discoveries of vaccines especially for rabies and anthrax, and for the discovery of the process of fermentation and pasteurization.

Complete answer:
The scientist related to the theory of spontaneous generation and experiments with the swan neck flask is Louis Pasteur. He used a flask whose neck was swan-shaped and hence named a Swan Neck Flask. He put a nutrient-rich food brought in the flask and boiled it to kill other microorganisms that were already present there which he then allowed to settle. Due to the shape of the flask, the infusion was exposed to air and dust particles and other things in the air never made it into the infusion. They get trapped in the curve of the swan neck flask and Louis Pasteur allows them to sit and the microorganisms never appear in the flask. The microorganisms began to appear in the infusion when he tipped the flowers and allowed the things trapped in the neck to get into the brought and multiply rapidly.

Additional Information: Van Helmont: He was known to be a physiologist and chemist who worked during the years of Paracelsus and gave rise to iatrochemistry which was sometimes considered as the founder of pneumatic chemistry.
Miller: He was an American chemist who took an experiment on the origin of life by demonstrating a wide range of vital organic components that was synthesized by fairly chemical processes from inorganic substances. He performed the Miller-Urey experiment in 1952 that showed complex organic molecules can be synthesized from inorganic precursors.
Haeckel: He was a German zoologist and philosopher who described the names of thousand species and mapped A genealogical tree that was related to all life forms and promoted recapitulation theory by claiming an individual organism’s biological development.
So, the correct answer is 'Louis Pasteur'.

Note: Louis Pasteur was one of the fathers of the germ theory and was famous for or developing the pasteurization process by stating that microbes were responsible for souring alcohol. He developed vaccines for rabies and saved the silk industry.