Which is a traditional drink of South India?

Assertion: Yeasts such as $Saccharomyces \text{ } cerevisiae$ are used in the baking industry.
Reason: Carbon dioxide produced during fermentation causes bread dough to rise by thermal expansion.

In which food would you find lactic acid bacteria? Mention some of their useful applications.

Which of the following is produced by the process of fermentation by microbes?

The large holes in Swiss cheese are due to the production of a large amount of $a$ by a bacterium $b$. Here $a$ and $b$ refer to:

Give examples to prove that microbes release gases during metabolism.