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Which factor most strongly determines how quickly a pesticide is degraded in soil?

  • A.Whether soil microorganisms possess enzymes able to attack it
  • B.The colour of the soil surface
  • C.The depth of the water table lying beneath the treated field
  • D.The number of earthworms present

Answer: A

Microbial degradation is the main route of loss for most pesticides, so persistence depends chiefly on whether an organism present can metabolise the molecule. Compounds with unusual synthetic structures are persistent precisely because no such enzyme is common.

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