Answer: Pseudomonas fluorescens.
- A Pseudomonas fluorescens
- B Pseudomonas putida
- C Pseudomonas aeruginosa
- D Pseudomonas syringae
Correct answer: A. Pseudomonas fluorescens
Explanation: Pseudomonas fluorescens is used as a bioherbicide to control Phalaris minor (a weed in wheat fields) without harming the wheat crop.
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