The most appropriate definition of a natural resource is that it is a substance/commodity that is:

What does the high level of total coliform count in river Ganga indicate?

Enlist four simple choices which can make a difference in our energy consumption patterns.

Which of the following activities in a forest is not harmful to the environment?

The $pH$ of a water sample collected from a river was found to be acidic in the range of $3.5-4.5$. On the banks of the river were several factories that were discharging effluents into the river. The effluents of which one of the following factories is the most likely cause for lowering the $pH$ of river water?

Names of endangered plant species are published in $....$