Critical dissolved oxygen (D.O.) deficit occurs in which one of the following zones of pollution of ‘oxygen sag curve’ in case of self-purification of natural streams?

Critical dissolved oxygen (D.O.) deficit occurs in which one of the fo

1.	Critical dissolved oxygen (D.O.) deficit occurs in which one of the following zones of pollution of ‘oxygen sag curve’ in case of self-purification of natural streams?
A.	Zone of recovery
B.	Zone of active decomposition
C.	Zone of degradation
D.	Zone of clear water
Answer» C. Zone of degradation

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Critical dissolved oxygen (D.O.) deficit occurs in which one of the following zones of pollution of ‘oxygen sag curve’ in case of self-purification of natural streams?

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