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Environmental Issues — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYEnvironmental Issues1 Mark
MCQ
When huge amount of $CO_2​$ is dumped into a river, the $\ce{BOD}$ will:
  • A
    Increase
  • B
    Slightly decrease
  • ✓
    Remain unchanged
  • D
    Decrease
✓

Answer

Correct option: C.
Remain unchanged
Biological Oxygen Demand is a measurement of the amount of dissolved oxygen that is used by aerobic microorganisms when decomposing organic matter in water.
It is expressed in milligrams of oxygen consumed per liter of the sample during $5$ days of incubation at $20^\circ C$ and is used to determine the degree of organic pollution of water.
Hence when a huge amount of carbon dioxide is added $\ce{BOD}$ will not be affected.

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