20. Which of the following statements are true with respect to eutrophication?
i) Eutrophication is the nutrient enrichment of a water body
ii) Reducing water pollution can aid in controlling eutrophication.
iii) Aquaculture may further increase eutrophication of water bodies
Options:
20. Which of the following statements are true with respect to eutrophication?
i) Eutrophication is the nutrient enrichment of a water body
ii) Reducing water pollution can aid in controlling eutrophication.
iii) Aquaculture may further increase eutrophication of water bodies
Options:
The correct option is D d) All of the above
D) Explanation:
Eutrophication is the enrichment of an ecosystem with chemical nutrients, typically compounds containing nitrogen, phosphorus, or both.
Extensive use of fertilizers results in significant concentrations of nutrients particularly nitrogen, in agricultural runoff. If eroded soil reaches the lake, both phosphorus and the nitrogen in the soil contribute to eutrophication.
Rain water contains phosphorus and nitrogen from air pollution. As nitrogen is more mobile in the atmosphere than phosphorus, it is usually over 20 times more concentrated than phosphorus. Nitrogen can only be reduced in rain water by extensive controls of the air pollution in the entire region.
When lakes are used for aquaculture, excess fish food pollutes the water as complete use of the food cannot be achieved. Nitrogen and phosphorus present in the excess food is dissolved or suspended in the water. The use of lakes for aquaculture therefore needs careful environmental planning and management practices by the owners and workers.
D)
Explanation:
Eutrophication is the enrichment of an ecosystem with chemical nutrients, typically compounds containing nitrogen, phosphorus, or both.
Extensive use of fertilizers results in significant concentrations of nutrients particularly nitrogen, in agricultural runoff. If eroded soil reaches the lake, both phosphorus and the nitrogen in the soil contribute to eutrophication.
Rain water contains phosphorus and nitrogen from air pollution. As nitrogen is more mobile in the atmosphere than phosphorus, it is usually over 20 times more concentrated than phosphorus. Nitrogen can only be reduced in rain water by extensive controls of the air pollution in the entire region.
When lakes are used for aquaculture, excess fish food pollutes the water as complete use of the food cannot be achieved. Nitrogen and phosphorus present in the excess food is dissolved or suspended in the water. The use of lakes for aquaculture therefore needs careful environmental planning and management practices by the owners and workers.
