The carrier of fluorosis is:

Which of the following plans has been initiated by the Ministry of Environment and Forests to protect rivers from water pollution?

By which method can the quantity of organic pollutants in water be determined?

Water pollution is caused by

$(a)$ Discuss the major programs that the Ministry of Environment and Forests,Government of India,has initiated for saving major Indian rivers from pollution.
$(b)$ Ganga has recently been declared the national river. Discuss the implication with respect to pollution of this river.

Domestic and hospital sewage often contains many undesirable pathogenic microorganisms. If discharged into water bodies without proper treatment, which of the following diseases can be caused?
$I-$ Dysentery or Diarrhoea
$II-$ Typhoid
$III-$ Hepatitis
$IV-$ Cancer
$V-$ Cholera
$VI-$ $AIDS$