Various types of chemicals used in modern agriculture such as inorganic fertilisers, pesticides and herbicides are also pollution-generating components. These chemicals are washed down to rivers, lakes and tanks. These chemicals also infiltrate the soil to reach the groundwater. Fertiliser induces an increase in the nitrate content of surface waters. Cultural activities such as pilgrimage, religious fairs, tourism, etc. also cause water pollution.

Which of the following is not a water-borne disease?

Influenza

Water pollution is a source of various water-borne diseases. The diseases commonly caused due to contaminated water are diarrhoea, intestinal worms, hepatitis, etc.