Select the appropriate option for $Saccharomyces \ cerevisiae$.

Penicillin was discovered while observing the inhibition of growth of which organism?

Which of the following are included in microorganisms?

From the given below,which one increases vitamin $B_{12}$ in our stomach and also plays a very beneficial role in checking disease-causing microbes?

Who discovered the process of fermentation?

Penicillium notatum stops the growth of