Give examples to prove that microbes release gases during metabolism.

Explanation

The examples of bacteria that release gases during metabolism are:
Bacteria and fungi carry out the process of fermentation and during this process, they release carbon dioxide. Fermentation is the process of converting a complex organic substance into a simpler substance with the action of bacteria or yeast. Fermentation of sugar produces alcohol with the release of carbon dioxide and very little energy.
`"Glucose overset "("without ")/("oxygen")"alcohol " + " energy " + CO_2 `
The dough used for making idli and dosa gives a puffed appearance. This is because of the action of bacteria which releases carbon dioxide. This `CO_2` released from the dough gets trapped in the dough, thereby giving it a puffed appearance.