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Question
Read the following statements related to eutrophication and select the correct option stating true (T) and false (F).
A. It is the process of aging of water bodies due to the excessive growth of algae, plants and other aquatic organisms.
B. It can be natural or accelerated.
C. Accelerated eutrophication occurs at a slow rate which cannot be predicted.
D. The prime contaminants for this phenomenon are nitrates and phosphates.
Read the following statements related to eutrophication and select the correct option stating true (T) and false (F).
A. It is the process of aging of water bodies due to the excessive growth of algae, plants and other aquatic organisms.
B. It can be natural or accelerated.
C. Accelerated eutrophication occurs at a slow rate which cannot be predicted.
D. The prime contaminants for this phenomenon are nitrates and phosphates.
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Solution
The correct option is A A - T, B - T, C - F, D - T
Eutrophication is the process of aging of water bodies due to the enrichment of the water by nutrients.
This causes excessive growth of algae, plants and other aquatic organisms in the water bodies.
Hence statement A is true.
Eutrophication is of two types, natural and accelerated.
Hence, statement B is true.
Natural eutrophication: The water is cold and clear in a young lake supporting little life. As time passes, the nutrients (nitrates and phosphates) get introduced into the water body from the streams. This causes the growth of aquatic organisms and slowly the plant and animals begin to flourish.
As the fertility (amount of nutrients) increases in water bodies, the algae grow rapidly and block the sunlight affecting the aquatic life in the lake. The organisms die and their organic remains get piled up making the lake shallow and warmer.
Slowly marsh plants begin to grow and eventually the lake gives way for floating plants.
Over a period of time, the water body gets converted into land. This might take thousands of years.
Accelerated eutrophication: It is otherwise called cultural eutrophication. The pollutants produced due to human activities like effluents from the industries and homes can accelerate the aging process of water bodies drastically.
The prime contaminants for this phenomenon are nitrates and phosphates. They cause profuse growth of algae like cyanobacteria causing unsightly scum and unpleasant odours.
These organisms consume lots of oxygen and oxygen level gets depleted which affects aquatic life. Also, the pollutants can cause death of fish and other aquatic life.
Cultural eutrophication occurs at a faster rate and in no time, the water body gets converted to land.
Hence, statement C is false and D is true.
Eutrophication is the process of aging of water bodies due to the enrichment of the water by nutrients.
This causes excessive growth of algae, plants and other aquatic organisms in the water bodies.
Hence statement A is true.
Eutrophication is of two types, natural and accelerated.
Hence, statement B is true.
Natural eutrophication: The water is cold and clear in a young lake supporting little life. As time passes, the nutrients (nitrates and phosphates) get introduced into the water body from the streams. This causes the growth of aquatic organisms and slowly the plant and animals begin to flourish.
As the fertility (amount of nutrients) increases in water bodies, the algae grow rapidly and block the sunlight affecting the aquatic life in the lake. The organisms die and their organic remains get piled up making the lake shallow and warmer.
Slowly marsh plants begin to grow and eventually the lake gives way for floating plants.
Over a period of time, the water body gets converted into land. This might take thousands of years.
Accelerated eutrophication: It is otherwise called cultural eutrophication. The pollutants produced due to human activities like effluents from the industries and homes can accelerate the aging process of water bodies drastically.
The prime contaminants for this phenomenon are nitrates and phosphates. They cause profuse growth of algae like cyanobacteria causing unsightly scum and unpleasant odours.
These organisms consume lots of oxygen and oxygen level gets depleted which affects aquatic life. Also, the pollutants can cause death of fish and other aquatic life.
Cultural eutrophication occurs at a faster rate and in no time, the water body gets converted to land.
Hence, statement C is false and D is true.
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