NEET2004ZoologyMicrobes in Human WelfareActual
A lake with an inflow of domestic sewage rich in organic waste may result in
Options
- Adrying of the lake very soon due to algal bloom
- Ban increased production of fish due to lot of nutrients
- Cdeath of fish due to lack of oxygen
- Dincreased population of aquatic food web organisms .
Correct answer
C. death of fish due to lack of oxygen
Step-by-step solution
Domestic sewage rich in organic waste will exert a very high demand of oxygen in order to get biodegraded. Thus depleting the dissolved oxygen below critical level necessary to support aquatic life. Especially fish, which is very sensitive to the dissolved oxygen available in water, starts dying if the level goes below 4 mg / L .