Class 12 NEET Biology Microbes in Human Welfare

The biological process of conversion of starch into ethanol is a two-step process. The first step involves saccharification, where starch is converted into sugar using an amylolytic microorganism or enzymes such as glucoamylase and -amylase. The second step is fermentation, where sugar is converted into ethanol using Saccharomyces cerevisiae.
Therefore, the correct answer is option B.