A) Measuring oxygen levels in blood
B) Computing oxygen levels in forest ecosystems
C) Pollution assay in aquatic ecosystems
D) Assessing oxygen levels in high altitude regions
Correct Answer: C
Solution :
Exp. [c] Biochemical Oxygen Demand (BOD) also called Biological oxygen demand is the amount of dissolved oxygen needed (i.e., demanded) by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period. The BOD value is most commonly expressed in milligrams of oxygen consumed per litre of sample during 5 days of incubation at 20 °C and is often used as a surrogate of the degree of organic pollution of water. BOD can be used as a gauge of the effectiveness of wastewater treatment plants. It is listed as a conventional pollutant in the US Clean Water Act.
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