Answer: It controls several plant pathogens in roots.
- A It controls several plant pathogens in roots
- B It fixes atmospheric nitrogen in soil
- C It increases phosphorus in leaves
- D It produces antibiotics for humans
Correct answer: A. It controls several plant pathogens in roots
Explanation: Trichoderma species are free-living fungi in root ecosystems that act as effective biocontrol agents against several soil-borne plant pathogens.
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