WAEC Biology 2025 Objective — Question 33
Question 33 of 50 from the West African Examinations Council (WAEC) Biology 2025 Objective paper, with the correct answer and a full explanation.
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Which of the following sequences represents the trend in eutrophication?
- A. Heavy mineralization - lack of oxygen - massive algal growth
- B. Excessive nitrates - massive algal growth - lack of oxygen - death of aquatic organismsCorrect
- C. Excessive phosphates - lack of oxygen - massive algal growth - death of aquatic organisms
- D. Massive algal growth - excessive nitrates - lack of oxygen - death
Explanation
Eutrophication is the process in which a body of water becomes enriched with nutrients (like nitrates and phosphates), leading to excessive algal growth. As the algae die and decompose, oxygen is consumed, resulting in oxygen depletion in the water, which can lead to the death of aquatic organisms.
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