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Which of the following statements does not apply to eutrophication.

1. It is natural ageing of a lake by nutrient enrichment of its water
2. In a young lake the water is cold and clear and supports less life
3. The nutrients such as sulphur and phosphorus encourage the growth of aquatic organisms in the lake
4. Pollutants released by man radically accelerate the ageing process of a lake E . Overgrowth of algae leads to scum that depletes the level of dissolved oxygen in water

Correct answer: The nutrients such as sulphur and phosphorus encourage the growth of aquatic organisms in the lake

Solution

Eutrophication is the enrichment of a lake with nutrients that promote excessive plant and algal growth. Phosphorus is a key nutrient, but sulphur is not usually cited as a cause of eutrophication, so that statement does not properly apply.

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