$A$ : Cheese is one of the oldest food items in which microbes are used.

$R$ : Different varieties of cheese are known by characteristic texture, flavour and taste.

Which gas is released during the process of fermentation that gives the puffy appearance to dough for making bread

How are microbes useful in household products ?

Read the following four statements $(A -D)$ about certain mistakes in two of them :
$(A)$ Dough, which is used for making foods such as dosa and idli is fermented by fungi and algae
$(B)$ Toddy, a traditional drink of southern India is made by fermenting sap from palms.
$(C)$ Large hole in 'Swiss cheese' are due to production of large amount of methane by Propionibacterium
sharmanii
$(D)$ In our stomach, lactic acid bacteria play very beneficial role in checking disease – causing microbes
Which are the two statements having mistakes ?

Why does 'Swiss cheese' have big holes ?