Question
The excessive presence of ________ mainly causes eutrophication in lakes.
This question was previously asked in
RRB NTPC 2025 Graduate CBT 2 Question Paper PDF (10-Jul-2026) (Shift 1)
The correct answer is
Nitrogen and phosphorus
Excessive nitrogen and phosphorus, often from fertiliser runoff, mainly causes eutrophication in lakes by promoting excessive algae growth.
Calcium carbonate, iron and copper, and silica do not drive the nutrient-rich conditions that lead to eutrophication in the same way.
Hence, 'Nitrogen and phosphorus' is the correct answer.
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