The process carried out by yeast that causes bread dough to rise is?

The process carried out by yeast that causes bread dough to rise is fermentation.

Here's how it works:

1. Yeast consumes sugar: Yeast feeds on sugars present in the flour.

2. Yeast produces carbon dioxide and alcohol: As a byproduct of their metabolism, yeast produces carbon dioxide (CO2) gas and alcohol.

3. CO2 creates bubbles: The CO2 gas gets trapped within the dough, creating tiny bubbles.

4. Bubbles make dough rise: The expanding bubbles cause the dough to rise and become light and airy.

This is the magic of yeast that transforms flat dough into fluffy bread!