Yeast is used in making bread because it produces____________?
Correct answer: A. Carbon dioxide
- A. Carbon dioxide
- B. Sugar
- C. Bacteria
- D. Oxygen
- E. None of these
Explanation
Yeast ferments sugars in dough and releases carbon dioxide gas. The trapped gas bubbles make the dough rise, while the alcohol produced largely evaporates during baking.
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Chemical principles appear in acids, bases, salts, solutions, oxidation, combustion, corrosion and neutralisation, along with the composition and uses of common substances. Coverage includes soaps and detergents, fertilizers, medicines, food preservatives, polymers, fuels and water treatment, while distinguishing physical changes from chemical reactions.
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