Why does bread dough rise?
Yeast produces gas inside dough.
The short answer
In dough with baker’s yeast, these microorganisms use sugars and produce carbon dioxide during fermentation. Trapped bubbles of gas help the stretchy dough expand.
An example to make sense of it
Many holes in the crumb come from those bubbles. Biological yeast and chemical raising agents generate gas through different processes.
How to answer
Choose the conclusion best supported by the facts and press Check. You can revise an incorrect answer and use help whenever you wish.
Preparing the case…