Question

A food stall owner was preparing dough for making cake. 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. Why did the dough rise?

• A. The sugar that was released made the dough rise.
• B. Yeast increased in number making the dough rise.
• C. Carbondioxide relased by the yeast made it to rise.
• D. Warm air made the dough to rise.

Answer 1

The correct option is C Carbondioxide relased by the yeast made it to rise.

The yeast changes the sugar in the dough into carbon dioxide gas and ethanol (alcohol). The gas, trapped in the dough, makes it rise and the alcohol produced during fermentation evaporates during baking.