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

Options

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

Answer

C

Explanation

Domestic sewage rich in organic waste will exert a very high demand of oxygen in order in order toget biodegraded.Thus depleting the dissoved oxygen below critical level necessary to support aquatic life.Especially fish,which is very sensitive to the dissolved oxygen availble in water,starts dying of the level goes below 4 mg/L.