Question

why there is no bacteria in water of ganga​

Answer 1

The waters of Ganga when added to other water resources in adequate amount, causes the bacteriophage in it to quickly multiply cleaning the new water resource of any bacteria present in it. ... The Ganges' self-purifying quality leads to oxygen levels 25 times higher than any other river in the world.

Answer 2

because due to the presence of bacteriophages in all the rivers and Ganga river also