Answer: Saccharomyces cerevisiae.
- A Lactobacillus
- B Saccharomyces cerevisiae
- C Aspergillus niger
- D Nostoc
Correct answer: B. Saccharomyces cerevisiae
Explanation: Saccharomyces cerevisiae ferments the sap of palms to produce toddy, a traditional fermented beverage.
Sewage passes through physical removal (primary), then aerobic biological treatment where microbes form flocs that consume organic matter (secondary); the settled activated sludge is then digested anaerobically to produce biogas - a deliberate switch from aerobic to anaerobic conditions between stages.
Concept context
Microorganisms in food, medicine, sewage treatment, biocontrol, and biofertilizers