Which of the following plants is used for the purification of water?

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

The Chipko movement is related to the conservation of forests in:

Select the incorrect statement.

Which is the main causative factor of desertification?

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?