Class VII

Human feaces stimulates growth of
  1. algae
  2. fungi
  3. bacteria
  4. viruses
In tanks containing untreated sewage, water is separated from solid waste by
  1. sand
  2. gravels
  3. soil
  4. special filters
Infected feaces of humans contain
  1. Bacteria
  2. Viruses
  3. Snails
  4. Worms
Distilled water
  1. is suitable for drinking
  2. is not suitable for drinking
  3. can be poisonous
  4. can be bitter in taste
Reason of water being under ground is
  1. oceans make tunnels due to high water pressure
  2. due to salt in the water, it starts making space in the soil for movement
  3. some of the rain water is soaked in the soil
  4. rivers eventually run underground
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