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A river with an inflow of domestic sewage rich in organic waste may result in
A
increased population of aquatic food web organisms.
B
an increased production of fish due to biodegradable nutrients.
C
death of fish due to lack of oxygen.
D
drying of the river very soon due to algal bloom.
Explanation
High BOD depletes dissolved oxygen.
Detailed Solution
Organic waste in sewage is decomposed by microbes that use up dissolved oxygen, increasing the biological oxygen demand (BOD). This causes death of fish due to lack of oxygen.