Which bacteria protect our stomach from harmful bacteria?

Toddy is a traditional drink made by fermenting sap from which plant?

Baker's yeast is:

The microorganism that converts milk into curd is ..........

Which of the following food items are produced by the process of fermentation?

$A$: Cheese is one of the oldest food items in which microbes are used.
$R$: Different varieties of cheese are known by their characteristic texture,flavour,and taste.