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

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

Which of the following is an inexhaustible resource?

The cooking gas cylinder is filled with .......

Loss of forest,urbanization,and increasing pollution are all due to:

The effect of pollution is first and most marked on: