Class VII

Waste which takes 80 to 100 years to be decomposed in landfill is
  1. aluminum can
  2. paper bag
  3. plastic bag
  4. disposable diaper
Poisonous substances that can be present in industrial wastes does not includes
  1. phosphates
  2. nitrates
  3. mercury and lead
  4. oxygen
Sediments in water blocks the
  1. sunlight
  2. carbon dioxide
  3. ethane
  4. methane
According to World Health Organization, percentage of deaths due to environmental factors is
  1. 85%
  2. 25%
  3. 50%
  4. 65%
Chemical substance used to destroy weeds in crops is called
  1. herbicides
  2. carob-oxides
  3. monoxides
  4. pesticides
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