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Yeast cells used in bread-making make the dough rise because
AThey release hydrogen gas during their respiration
BThey release oxygen gas in alcoholic fermentation
CThey release nitrogen gas during their respiration
DThey release CO2 gas in alcoholic fermentation
Answer & Solution
Correct answer: D. They release CO2 gas in alcoholic fermentation
1. The chapter mentions alcoholic fermentation by yeast.
2. Yeast ferments sugar to ethanol and CO2.
3. The CO2 forms bubbles in the dough and makes it rise.
4. So option A is correct.
_Source: Selina Concise Biology Class 9, Ch 7 Respiration in Plants (Mistral OCR'd PDF), section on fermentation_
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