UPSC 2014 CDS I GK Paper

Release of carbon dioxide gas causes dough (a mixture of flour,water, etc.) to rise when yeast is added to it. Leavening agent causeexpansion of dough by the release of gases within such mixtures, thus,producing baked products with porous structure. Yeast, bakingpowder, and baking soda are examples of leavening agents.