What is the role of sugar in the experiment

Predict possible scenario if the setups were incubated in following areas:

A. refrigerator

B. 60 incubator

Answer:The purpose of any leavener is to produce the gas that makes bread rise. Yeast does this by feeding on the sugars in flour, and expelling carbon dioxide in the process ... That amount of fungi can churn out a significant amount of carbon dioxide, provided it has the simple sugars it uses as food.

Answer: A. refrigerator