Class VIII

Over-exploitation includes excessive
  1. energy usage
  2. hunting
  3. both a and b
  4. plantation
Maintenance of oxygen and carbon dioxide in air is done by
  1. forests
  2. humans
  3. animals
  4. global warming
When forests are cleared on a very large scale by cutting or burning them down it is
  1. forestation
  2. deforestation
  3. plantation
  4. incantation
. If untreated waste water will be directly spill in to rivers, sea and lakes it may
  1. contaminate
  2. polluted
  3. spread diseases
  4. all of them
Buried waste contain
  1. toxic chemicals
  2. bacterial
  3. both a and b
  4. useful minerals
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