What is causing concern for the Taj Mahal?

  • A
    Oxygen
  • B
    Hydrogen
  • C
    Chlorine
  • D
    Sulfur dioxide

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In which of the following aquatic ecosystems is the maximum biomagnification observed?

Drinking mineral water with a very low level of pesticides (about $0.02 \ ppm$) for long periods may:

$A$: Water hyacinth is one of the most invasive weeds.
$R$: It increases the dissolved oxygen of water.

Acid rain is caused by,or recent reports of acid rain in some industrial cities are due to the effect of atmospheric pollution by:

Which of the following is a major source of water and soil pollution?

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