Unit 21 · Biotechnology and Genetic Modification
Question Bank
Cambridge IGCSE Biology 0610 · 70 questions
Q2Biotechnology and Genetic Modification
Why does bread dough rise?
(a)Yeast produces carbon dioxide
(b)Yeast produces oxygen
(c)Yeast produces ethanol vapour only
(d)Enzymes digest starch into gas
Correct answer: (a) Yeast produces carbon dioxide
Explanation: Anaerobic respiration of yeast releases CO2 which forms bubbles in the dough.
Related lesson
21.1 Biotechnology and genetic modificationBiotechnology and Genetic Modification Tags