Question

In a lake an inflow domestic sewage rich in organic waste may result in

• A. Drying of the lake very soon due to algal bloom.
• B. An increased production of fish due to lot of nutrients.
• C. Death of fish due to lack of oxygen.
• D. Increased population of aquatic food web organism.

Answer 1

Answer: (C)

Death of fish due to lack of oxygen.

Eutrophication is a condition where the excessive enrichment of the environment leads to overgrowth of the algae in the water bodies which leads to decrease in the oxygen content of the environment as the dissolved oxygen of the water is used up by these growing plants. Negative environmental effects include hypoxia, the depletion of oxygen in the water, which may cause death to aquatic animals.

Thus, the correct answer is option C.