Question

In anaerobic respiration of yeast

• A. $O_2$ is given out
• B. ${CO}_2$ is given out
• C. ${CO}_2$ is taken in
• D. $O_2$ is taken in

Answer 1

The correct option is B ${CO}_2$ is given out

Yeast respires anaerobically (in the absence of oxygen) . The process is known as fermentation. Glucose is the respiratory substrate.

The glucose is converted to pyruvate by the process of glycolysis. This process is independent of oxygen. If oxygen is absent, the pyruvate is broken by yeast into ethanol releasing carbon dioxide along with the production of 2 ATP.

So, the correct answer is 'CO${}_2$ is given out'.