Yeast and sugar solution are kept at different temperatures. The rate of CO₂ production rises to 40 °C then falls because

  1. respiration enzymes are denatured at high temperatures
  2. yeast stops needing sugar
  3. oxygen runs out at 40 °C
  4. CO₂ dissolves faster
Answer

A) respiration enzymes are denatured at high temperatures

Respiration is enzyme-controlled. O Level Biology · Topic 10 Respiration · 10.1 Respiration

Biology MCQ · More O Level Biology: Respiration MCQs · Practise