Biology
WAEC 2025
Which of the following sequences represents the trend in eutrophication?
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A.
Heavy mineralization→ lack of oxygen→ massive algal growth
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B.
Excessive nitrates→ massive algal growth →lack of oxygen→death of aquatic organisms
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C.
Excessive phosphates→lack of oxygen→massive algal growth→ death of aquatic organisms
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D.
massive algal growth→excessive nitrates→lack of oxygen
Correct Answer: Option B
Explanation
Eutrophication is a process that occurs when a water body becomes overly enriched with nutrients (primarily nitrates and phosphates), often from agricultural runoff or sewage. This leads to the following sequential trend: Excessive nitrates → massive algal growth → lack of oxygen→ death of aquatic organisms.
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