What is the main problem caused by the use of pesticides?

  • A
    Their residues persist in water and other components of the environment.
  • B
    Mosquitoes have become resistant to $DDT$.
  • C
    They kill silkworms.
  • D
    They deform the gills of some fishes.

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Pesticides are chemicals that kill:

Most effective pesticides are

Which of the following is not an organochlorine?

Which important greenhouse gas (other than methane) is produced in agricultural fields?

Which pesticide is commonly used in public health programmes?

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