pasteur boiled liquid in his swan-necked flasks to;?

Question

a.collect dust particles
b.enhance growth conditions for microorganisms.
c.to kill any microorganisms present in the broth

Answer 1

The question is wrongly asked. Firstly only heating won't work.Pasteur Heated the liquid to about60-70 Celsius then he also COOLED it SUDDENLY. Due to this the cell contents of the bacteria first expanded then due to cooling they had to contract.this set up a strain on the cell contents as a result of which the bacteria died.

Answer 2

"Louis Pasteur demonstrated that the fermentation process is caused by the growth of microorganisms, and that the growth of microorganisms in nutrient broths is not due to spontaneous generation.

He exposed boiled broths to air in vessels that contained a filter to prevent all particles from passing through to the growth medium, and even in vessels with no filter at all, with air being admitted via a long tortuous tube that would not allow dust particles to pass. Nothing grew in the broths; therefore, the living organisms that grew in such broths came from outside, as spores on dust, rather than spontaneously generated within the broth. This was one of the last and most important experiments disproving the theory of spontaneous generation. The experiment also supported germ theory."

Answer 3

Think about this ... why do we make sure we cook meat thoroughly? The heat kills bacteria. Same thing Pasteur was doing.