Answer: Resistance to root pathogens and tolerance to salinity.
- A Direct atmospheric nitrogen fixation within the root cortex
- B Resistance to root pathogens and tolerance to salinity
- C Production of plant growth hormones as their sole additional benefit
- D Conversion of soil urea into ammonia for plant uptake
Correct answer: B. Resistance to root pathogens and tolerance to salinity
Explanation: Glomus mycorrhizae enhance phosphorus absorption and also provide resistance to root-borne pathogens and tolerance to salinity and drought stress.
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