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Safe Disposal of Wastes — BIOLOGY STD 9 — Question

ICSE BoardEnglish MediumSTD 9BIOLOGYSafe Disposal of Wastes1 Mark
MCQ
Sewage water is purified by
  • ✓
    microorganisms
  • B
    light
  • C
    fishes
  • D
    aquatic plants
✓

Answer

Correct option: A.
microorganisms

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