Pollution in rivers like the Ganga is caused by which of the following factors?

Industries dumping wastes into rivers

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Releasing untreated sewage into rivers

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Pesticide and fertiliser run-off from farms

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Plantation of trees on the river bank

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Solution

The correct options are
A Industries dumping wastes into rivers
B Releasing untreated sewage into rivers
C Pesticide and fertiliser run-off from farms
Pollution in rivers is primarily caused by the release of waste chemicals and raw untreated sewage into rivers. This is particularly a problem for Ganga and Yamuna. Excessive use of fertilisers and pesticides can seep into rivers causing pollution. This is a severe issue for the rivers Indus, Sutlej and Beas.
Planting trees on the banks of rivers helps in reducing soil erosion. The roots of the trees hold the soil tightly.

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