2. Give examples to prove that microbes release gases during metabolism.
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.
→ 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
CO2 released from the dough gets trapped in the dough, thereby giving it a
puffed appearance.
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