MCQ
$\text{BOD}$ is:
- AThe-amount of $\mathrm{O}_2$ utilised by organisms in water.
- BThe amount of $\mathrm{O}_2$ utilised by micro organisms for decomposition.
- ✓The total amount of $\mathrm{O}_2$ present in water.
- DAll of the above.
✓
Answer
Correct option: C.
The total amount of $\mathrm{O}_2$ present in water.
Biochemical oxygen demand $\text{(BOD)}$ is the amount of dissolved oxygen needed by aerobic biological organisms in a body of water to break down organic material present in a given water sample at certain temperature over a specific time period.
Micro$-$organisms involved in biodegradation of organic matter in the receiving water body consume a lot of oxygen, and as a result there is a sharp decline in dissolved oxygen downstream from the point of sewage discharge. This causes mortality of fish and other aquatic creatures.
Micro$-$organisms involved in biodegradation of organic matter in the receiving water body consume a lot of oxygen, and as a result there is a sharp decline in dissolved oxygen downstream from the point of sewage discharge. This causes mortality of fish and other aquatic creatures.
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