Certified Professional Food Manager (CPFM) Practice Test 2026 - Free CPFM Practice Questions and Study Guide

Yeast requires the presence of sugar and moisture for survival because it is a type of fungus that thrives in environments where it can readily obtain energy and nutrients. Sugars serve as a primary food source for yeast, allowing it to metabolize and grow. The presence of moisture is equally crucial, as it facilitates the absorption of nutrients and supports the metabolic processes necessary for yeast to function effectively.

In a suitable environment with ample sugar and moisture, yeast can carry out fermentation, which is vital for processes like bread making and brewing. This fermentation process yields carbon dioxide and alcohol, which play significant roles in leavening bread and producing alcoholic beverages.

Other options do not create the ideal conditions for yeast. High heat can kill yeast, dark and dry conditions do not provide the necessary moisture for growth, and cold weather along with low acidity can inhibit yeast activity and fermentation. Thus, the combination of sugar and moisture is fundamental for yeast survival and activity.