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A river with an inflow of domestic sewage rich in organic waste may result in:

  1. A
    Increased population of aquatic food web organisms
  2. B
    An increased production of fish due to biodegradable nutrients
  3. C
    Death of fish due to lack of oxygen
  4. D
    Drying of the river very soon due to algal bloom

Solution & Step-by-step Explanation

Decomposition of organic waste by microbes consumes a lot of oxygen, leading to a sharp decline in Dissolved Oxygen (DO). This causes the death of fish and other aquatic creatures.

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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

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