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A suppressive soil is one in which

  • A.A pathogen is present but causes little disease
  • B.No microorganisms of any kind can survive
  • C.All plants grown in it perform poorly
  • D.Nitrogen is permanently immobilised in biomass

Answer: A

In a suppressive soil the pathogen may be fully present and the crop susceptible, yet disease stays light because the resident community holds it in check; the property is lost when the soil is sterilised, which is how its biological basis was demonstrated.

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