Eutrophication
Chemistry ⇒ Environmental Chemistry
Eutrophication starts at 11 and continues till grade 12.
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A lake receives runoff containing 10 mg/L of nitrate and 2 mg/L of phosphate. Which nutrient is more likely to be the limiting factor for algal growth?
A river downstream from a city shows high levels of nitrate and phosphate, dense algal blooms, and low dissolved oxygen. What process is occurring in this river?
Describe how climate change may influence the process of eutrophication.
Describe the difference between point source and non-point source pollution in the context of eutrophication.
Describe the impact of eutrophication on aquatic biodiversity.
Describe the process of 'biomanipulation' as a strategy to combat eutrophication.
Describe the role of wetlands in preventing eutrophication.
Describe two major sources of nutrients that contribute to eutrophication.
Explain how eutrophication can affect recreational activities in lakes and rivers.
Explain how eutrophication can affect the dissolved oxygen levels in a lake.
Explain the role of phosphorus in the eutrophication process.
Explain the term 'algal bloom' in the context of eutrophication.
Explain why fish kills are often observed in eutrophic lakes.
Explain why shallow lakes are more susceptible to eutrophication than deep lakes.
Name one method used to control or prevent eutrophication in water bodies.
What is eutrophication?
A lake has experienced repeated algal blooms despite efforts to reduce nitrogen inputs. Explain, using chemical principles, why phosphorus control may be more effective in this scenario.
A reservoir receives 500 kg of nitrogen and 50 kg of phosphorus per year. According to the Redfield ratio, which nutrient should be targeted for reduction to most effectively control eutrophication? Show your reasoning.
Describe the chemical changes that occur in a stratified lake undergoing eutrophication during summer, focusing on the hypolimnion.
Explain how the Redfield ratio (C:N:P = 106:16:1) is relevant to understanding nutrient limitation and eutrophication in aquatic ecosystems.
