alleryCultural eutrophication of lakes is mainly due to excess of which nutrient?
APhosphorus
BSodium
CCalcium
DChlorine
Answer & Solution
Correct answer: A. Phosphorus
1. Farm fertilizers contain phosphorus applied in excess.
2. Runoff carries it down rivers into lakes.
3. Sodium, calcium and chlorine are not named as the cause.
_Source: Wikipedia, Water cycle, Biogeochemical cycling_
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