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 river(c) discharge of industrial wastes into river water (d) disposal of unburnt corpses into river water

Correct Answer: (a) immersion of ashes of the dead into the river 

Explanation:

 Coliform bacteria are usually present in the intestinal gut of human beings. These are present in the water when it is polluted by human urine, faeces or dead remnants like ashes.