40. When yeast reacts in bread dough, the dough rises mainly due to the production of
Answer: C
The dough rises mainly due to the production of carbon dioxide gas.
When yeast ferments in bread dough, it primarily produces carbon dioxide gas, which causes the dough to rise and create its airy texture.
A) water vapor
Water vapor is a byproduct of the baking process, but it does not significantly contribute to the rising of the dough during the fermentation phase. The primary mechanism for dough rising is the gas produced by yeast, not water vapor.
B) table salt
Table salt is used in bread making to enhance flavor and control yeast activity, but it does not cause the dough to rise. In fact, excessive salt can inhibit yeast fermentation, leading to less carbon dioxide production.
C) carbon dioxide gas
Carbon dioxide gas is the key product of yeast fermentation in bread dough. As yeast consumes sugars, it produces carbon dioxide, which gets trapped in the dough, causing it to expand and rise, creating the desired texture in bread.
D) acid
While acids can play a role in flavor and dough conditioning, they do not directly cause the dough to rise. The rising action is fundamentally due to the carbon dioxide produced by yeast, making acid an irrelevant option in this context.
Conclusion
Carbon dioxide gas is the definitive reason for the rising of bread dough during yeast fermentation, as it is the primary gas produced in this process. The other options, while related to bread making, do not contribute to the rising of the dough in the same way, making C the clear and correct choice.