Which of the following statements is/are correct?

I. Baker's yeast, Saccharomyces cerevisiae, is used to ferment the dough used for making bread.

II. Industrial-scale production often involves growing microbes in large vessels called fermentors.

III. Municipal wastewater is commonly referred to as sewage.

IV. Sewage needs to be treated in Sewage Treatment Plants (STPs) to reduce its pollution levels.

I, II, III and IV

The correct answer is Option (4) - I, II, III and IV

The correct statements are:

I. Baker's yeast, Saccharomyces cerevisiae, is used to ferment the dough used for making bread. This yeast helps in the process of leavening by converting the sugars in the dough into carbon dioxide, which causes the dough to rise.

II. Industrial-scale production often involves growing microbes in large vessels called fermentors. These vessels provide controlled conditions for the growth and reproduction of microbes used in various industrial processes, such as the production of antibiotics, enzymes, and biofuels.

III. Municipal wastewater is commonly referred to as sewage. It consists of domestic sewage from households, as well as industrial and commercial wastewater. It contains various pollutants and needs to be treated before being discharged into the environment.

IV. Sewage needs to be treated in Sewage Treatment Plants (STPs) to reduce its pollution levels. STPs employ various treatment processes to remove contaminants from sewage, including physical, chemical, and biological processes. This helps to minimize the impact of sewage on the environment and protect public health.

These statements highlight different aspects related to yeast fermentation, industrial microbial production, wastewater terminology, and the importance of sewage treatment.