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Environmental Issues — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYEnvironmental Issues1 Mark
MCQ
Biochemical Oxygen Demand $\text{(BOD)}$ in a river water:
  • A
    Remains unchanged when algal bloom occurs.
  • B
    Has no relationship with concentration of oxygen in the water.
  • C
    Gives a measure of salmonella in the water.
  • ✓
    Increases when sewage gets mixed with river water.
✓

Answer

Correct option: D.
Increases when sewage gets mixed with river water.

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