Class VII

Kind of land pollution in which salt content rises and land becomes unsuitable for farming is called
  1. carbonization of soil
  2. deoxygenating of soil
  3. salinization of soil
  4. oxygenation of soil
Kyoto Protocol agreement was signed in
  1. 1997
  2. 1990
  3. 1985
  4. 1980
According to World Health Organization, percentage of deaths due to environmental factors is
  1. 85%
  2. 25%
  3. 50%
  4. 65%
Farming activities, sewage, mining activities and soil erosion are causes of
  1. thermal pollution
  2. visual pollution
  3. air pollution
  4. noise pollution
Poisonous substances that can be present in industrial wastes does not includes
  1. phosphates
  2. nitrates
  3. mercury and lead
  4. oxygen
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