Which of the following statements regarding pollutants is correct?

  • A
    $DDT$ is a non-biodegradable pollutant.
  • B
    High levels of fluoride in drinking water cause osteoporosis.
  • C
    High levels of cadmium in drinking water cause black foot disease.
  • D
    Methyl mercury in water can cause 'Itai-Itai' disease.

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According to a $1990$ report,Delhi ranked $........$ among the $41$ most polluted cities in the world.

Provide the full names for the following abbreviations:
$(i)$ $HFC$
$(ii)$ $CFC$

Aerosols reduce primary productivity by

Write critical notes on the following:
$(a)$ Eutrophication
$(b)$ Biological magnification
$(c)$ Groundwater depletion and ways for its replenishment

The $CO_2$ content of the atmosphere has increased in the last $150$ years from:

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