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STD 12 - 8. microbes in human welfare — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 8. microbes in human welfare1 Mark
MCQ
Secondary sewage treatment is mainly a
  • A
    Chemical process
  • B
    Physical process
  • C
    Mechanical process
  • ✓
    Biological process
✓

Answer

Correct option: D.
Biological process
d
Secondary treatment of the liquid effluent from the primary settling tank is purely a biological treatment involving microbial activity

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