Maria owns a bakery and bakes many different types of yeast breads. One day she notices that the bread she baked is flat and does not contain the air bubbles that are usually present. Which of the following would be a good explanation for what has happened to her yeast?

Question

The yeast did not produce the carbon dioxide needed for the bread to rise.
The yeast produced too much carbon dioxide.
The yeast did not produce the alcohol needed for the bread to rise.
The yeast were very active and produced too much energy.

Answer 1

The most appropriate explanation for the flat bread is: The yeast did not produce the carbon dioxide needed for the bread to rise.

When yeast ferments, it produces carbon dioxide as a byproduct, which causes the dough to rise and create air bubbles. If the yeast fails to produce enough carbon dioxide, the bread will not rise properly, resulting in a flat loaf.