A) Is not polluted
B) Is very polluted
C) Does not have green plants
D) Get least amount of light
Correct Answer: B
Solution :
[b] Biochemical oxygen demand (BOD) 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 \[20{}^\circ C\] and is often used as a surrogate of the degree of organic pollution of water.
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