A lake with an inflow of domestic sewage rich in organic waste may result in:
Correct answer: B. Death of fish due to lack of oxygen
- A. Drying of the lake very soon due to algal bloom
- B. Death of fish due to lack of oxygen
- C. Increased population of aquatic food web organisms
- D. An increased production of fish due to lot of nutrients
Explanation
Organic sewage initially promotes algal growth, but its decomposition consumes dissolved oxygen in the water. Severe oxygen depletion then causes fish mortality, making death of fish the best answer.
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