Class VII

Large number of organisms can die if there is
  1. low level of oxygen
  2. low level of carbon dioxide
  3. low level of methane
  4. low level of ethane
. Fuel oils and coal are classified as
  1. deoxygenated fuels
  2. eutrophication fuels
  3. fossil fuels
  4. allotropic fuels
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
Disease that are caused by air pollution includes
  1. lung cancer
  2. respiratory illness
  3. skin diseases
  4. all of above
Kyoto Protocol agreement was signed in
  1. 1997
  2. 1990
  3. 1985
  4. 1980
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