The Ganga Action Plan for controlling pollution in the Ganges was started in:

Domestic sewage contains nutrients like nitrogen and phosphorus which favours the excessive growth of planktonic (free-floating) algae which can accelerate which of the following phenomenon?

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

For which major rivers in India has the Ministry of Environment and Forests initiated action plans?

What is the recommended forest cover for plains and hills according to the National Forest Policy of $1988$?

In the $1990s$,Delhi ranked ............. among the ...... most polluted cities of the world.