Alcoholic acid fermentation: The fermetation is carried out by many types of yeast such as saccharomyces cerevisiae. Lactic acid fermentation: In this process, pyruvic acid is reduced to lactic acid. It is carried out by many bacteria. gstreptococcus and many lactobacillus species. Correct Answer Alcoholic acid fermentation: The fermetation is carried out by many types of yeast such as saccharomyces cerevisiae. Lactic acid fermentation: In this process, pyruvic acid is reduced to lactic acid. It is carried out by many bacteria. gstreptococcus and many lactobacillus species.