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UPPSC Prelims 2023GS-IQ. 103 of 250
Q. 1031 markMedium
UPPSC Prelims 2023·GS-I
Biological Oxygen Demand (BOD) is a standard criteria for –
(a)Pollution assay in aquatic ecosystems
(b)Assaying O₂ level in high altitude regions
(c)Measuring O₂ level in blood
(d)Computing O₂ level in forest ecosystems