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Question
A food stall owner was preparing dough for making bhaturas. He added a pinch of yeast and sugar to the dough and left it in a warm place. After few hours, the dough had risen. There was a sour smell too.
Why did the dough rise?
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Solution
Yeast undergoes anaerobic respiration (in the absence of oxygen) and produces ethyl alcohol and carbon dioxide. The CO2 released during respiration by the yeast results in the rise of the dough.
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