1)Give the main cause for the abundant coliform bacteria in the river Ganga.
The main reason for the abundant coliform bacteria in the water of river Ganga is: (a) immersion of ashes of the dead into the river (b) washing of clothes on the banks of the river (c) discharge of industrial wastes into river water (d) disposal of unburnt corpses into river water
Which of the following is not a main cause of pollution in rivers like the Ganga ?