Question

The gas released during fermentation of sugar by yeast cells is

• A. carbon dioxide
• B. carbon monoxide
• C. hydrogen
• D. oxygen

Answer 1

The correct option is A

carbon dioxide

The correct option is (A):

Explanation for the correct option:

1. The process to convert sugar into alcohol and carbon dioxide is called fermentation.
2. Yeast is widely used in cake and bread preparation because it converts the sugar in the dough to carbon dioxide.
3. The yeast releases carbon dioxide, which fills the dough and increases its volume.
4. Due to the heat, more gas bubbles emerge when this dough is baked.
5. The bread rises and becomes soft and fluffy as the gas leaves.

Final answer: The gas released during fermentation of sugar by yeast cells is carbon dioxide.