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Entry of excess nutrients into lakes can increase from which source?

Answer and explanation

Correct answer: Untreated domestic waste and agricultural runoff

The direct answer is A: untreated domestic waste and agricultural runoff. Excess nutrients such as nitrogen and phosphorus enter lakes when sewage, household wastewater, detergents, animal waste, or fertilisers are carried by drains and rainwater. Step by step: waste or fertiliser is released; rain washes it into a stream or lake; nutrient levels rise; algae may grow excessively; oxygen can later fall and harm aquatic life. This process is called eutrophication. Option A is correct because it names real nutrient sources. Option B, clean mountain air, normally does not supply a large nutrient load. Option C is wrong because clean rainwater alone is not usually an important source of excess nutrients, though polluted rainwater can be different. Option D, controlled plantation, generally helps protect soil and water rather than causing nutrient pollution. Remember: sewage plus fertiliser runoff can feed algae and pollute a lake.

Related tags

NutrientsEutrophicationRunoff

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