alleryThe puffed up appearance of dough is caused by:
AHydrogen gases
BCarbon dioxide
COxygen bubbles
DNitrogen gases
Answer & Solution
Correct answer: B. Carbon dioxide
1. Dough for dosa and idli is fermented by microbes.
2. Fermentation releases a gas that is trapped inside.
3. That gas is carbon dioxide.
4. So the answer is carbon dioxide.
_Source: syllabus Biology, Ch 8 'Microbes in Human Welfare'_
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