Final answer:
True, flour causing the production of CO2 in Flask 5 is correct because the fermentation process by yeast produces carbon dioxide from the carbohydrates in flour.
Step-by-step explanation:
True. Flask 5 producing CO2 because flour is a carbohydrate is indeed correct. Flour, specifically the starch within it, is composed of long chains of glucose, a simple sugar.
When yeast is added to dough, it carries out alcoholic fermentation, where the glucose in the carbohydrates is converted into ethanol and carbon dioxide (CO2).
This CO2 is what causes bread dough to rise by creating bubbles within the dough that expand when heated during baking, resulting in the bread's soft and fluffy texture. The presence of carbon dioxide in the dough is an indicator that fermentation is taking place, thus causing the expansion and the characteristic holes in the bread after it bakes.