what is the puffed up appearance of idli dough due to ?

Dear Student,
Please find below the solution to the asked query:

The puffed up appearance of idli dough due to the production of carbon dioxide gas by Yeast present in it.
This happens because yeast added to flour reproduces rapidly and produces carbon dioxide gas while respiring. This gas fills the dough and increases its volume making it to rise or puff up.

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the puffed up appearance on the idli dough is due to the presence of yeast,, which makes them to grow in size..
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