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Biochemical Oxygen Demand (BOD) is the amount of oxygen required in ppm: (1) for the photochemical breakdown of waste present in 1 m³ volume of a water body. (2) for sustaining life in a water body. (3) by bacteria to break-down organic waste in a certain volume of a water sample. (4) by anaerobic bacteria to breakdown inorganic waste present in a water body.

1. (1)
2. (2)
3. (3)
4. (4)

Correct answer: (3)

Solution

Biochemical Oxygen Demand (BOD) specifically measures the amount of oxygen that bacteria require to decompose organic matter in a water sample, making option (3) the correct choice.

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