Assertion :The dough, which is used for making foods such as dosa and idli is fermented by bacteria.
Reason : The puffed-up appearance of dough is due to the production of CO₂ gas.

The assertion(R) and reason(R) both are true but reason is not the correct explanation of assertion .

The correct answer is Option (1) – The assertion(R) and reason(R) both are true but reason is not the correct explanation of assertion .

The assertion is that the dough used for making foods such as dosa and idli is fermented by bacteria. This statement is true. The fermentation process involves the action of microorganisms, often bacteria or yeast, which produce various byproducts, including carbon dioxide (CO₂).

The reason provided is that the puffed-up appearance of the dough is due to the production of CO₂ gas. This statement is also true. During the fermentation process, microorganisms produce CO₂ gas as a result of their metabolic activities. The accumulation of CO₂ gas causes the dough to rise and become puffy, contributing to the characteristic texture of foods like dosa and idli. However, the reason does not directly explain why the dough is fermented by bacteria; it merely explains a consequence of the fermentation process.