Class 7 Biology Wastewater Story Introduction


The water which has been adversely affected in quality by the presence of various pollutants is called as waste water.

Lather, oil, industrial chemicals, pesticides, global warming can pollute water.

Fig. oil in water

  • Waste water from sinks, showers, toilets, laundries flows down the drains.
  • Polluted water should not be wasted.
  • Pollutants should be removed by cleaning the water.

Fig. waste water  

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