Biology
Grade-7
Easy

Question

To eliminate contaminants from wastewater, _________ treatment uses physical, chemical, and biological methods.

  1. Distillation
  2. Potassium permanganate
  3. Sewage
  4. Carbon

hintHint:

The waste water that is collected in sewers.

The correct answer is: Sewage


    • Sewage is the waste water that is produced from residential and industrial areas
    • The sewage is collected by network of pipes called as sewerage
    • The waste water is subjected to treatment which can the be reused or can be released into water bodies
    • The water is treated by physical, chemical or biological methods  (depending on the nature of waste water)

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