A large number of fish are suddenly found floating dead on a lake. There is no evidence of toxic dumping by you find an abundance of phytoplankton, suggest a reason for the fish kill.

A large number of fish are suddenly found floating dead on a lake. The

1.	A large number of fish are suddenly found floating dead on a lake. There is no evidence of toxic dumping by you find an abundance of phytoplankton, suggest a reason for the fish kill.
Answer» The amount of dissolved oxygen present in water is limited. The abundance of phytoplankton causes depletion of this dissolved oxygen. This is because phytoplankton’s are degraded by bacteria present in water. For their decomposition, they require a large amount of oxygen. Hence, they consume the oxygen dissolved in water. As a result, the BOD level of water drops below 6ppm, inhibiting the growth of fish and causing excessive fish kill.

Discussion

No Comment Found

Related InterviewSolutions

A large number of fishes are suddenly found floating dead on a lake. There is no evidence of toxic dumping but you find an abundance of phytoplankton. Suggest a reason for the fish killing.
What is effect of excess of SO42- ion in drinking water?
What are fungicides?
What are primary and secondary pollutants of the air?
(a) Oxidation of sulphur trioxide in the absence of a catalyst is a slow process but this oxidation occurs easily in the atmosphere. Explain how does this happen. Give chemical reactions for the conversion of SO2 into SO3.(b) How is ozone produced in stratosphere?(c) What is the compound formed when CO combines with blood?
Name the different regions of the atmosphere along with their attitudes and temperature ranges.
What do you mean by "inversion temperature" in different regions of the atmosphere?
How NO2 pollution can be controlled? Explain.
In the following questions more than one option of Column I and Column II may match.Match the activity given in Column I with the type of pollution created by it given in Column II.Column I (ActivityColumn II (Effect)(i) Releasing gases to the atmosphere after burning waste material containing sulphur(a) Water pollution(ii) Using carbamates as pesticides(b) Photochemical smog, damage to plant life, corrosion to building material, induce breathing problems, water pollution(iii) Using synthetic detergents for washing clothes(c) Damaging ozone layer(iv) Releasing gases produced by automobiles and factories in the atmosphere.(d) May cause nerve diseases in human.(v) Using chlorofluorocarbon compounds for cleaning computer parts(e) Classical smog, acid rain, water pollution, induce breathing problems, damage to buildings, corrosion of metals.
In the following questions more than one option of Column I and Column II may match.Match the pollutant(s) in Column I with the effect(s) in Column II.Column IColumn II(i) Oxides of sulphur(a) Global warming(ii) Nitrogen dioxide(b) Damage to kidney(iii) Carbon dioxide(c) ‘Blue baby’ syndrome(iv) Nitrate in drinking water(d) Respiratory diseases(v) Lead(e) Red haze in traffic and congested areas

A large number of fish are suddenly found floating dead on a lake. There is no evidence of toxic dumping by you find an abundance of phytoplankton, suggest a reason for the fish kill.

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment