In fermentation-sensitive products, what effect does acidity have?

• A. It affects yeast activity and flavor.
• B. It determines color.
• C. It controls color of crust.
• D. It has no effect.

Answer: (A)

Acidity sets the pH of the dough, which directly influences how actively yeast ferments and what flavors develop. Yeast works best in a mildly acidic environment; if the dough becomes too acidic, yeast activity slows or stalls, changing gas production and rise, while a suitable level of acidity helps generate the characteristic fermentation flavors and aroma compounds. This impact on both rise and taste is especially important in fermentation-sensitive products where flavor balance depends on controlled fermentation. Color changes in dough or crust are mainly the result of baking reactions and pigments, not a direct effect of fermentation acidity, and saying there’s no effect overlooks how pH shapes yeast metabolism.