WAEC Biology 2025 Theory — Question 11
Question 11 of 21 from the West African Examinations Council (WAEC) Biology 2025 Theory paper, with the correct answer and a full explanation.
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3(c)(i) What is overcrowding in an ecosystem? (ii) List five effects of overcrowding in an ecosystem.
Model answer
(i) Overcrowding in an ecosystem refers to a situation where the population density of organisms exceeds the carrying capacity of the habitat. (ii) Effects: Increased competition for resources; Spread of diseases; Increased mortality rate; Aggressive behaviour and stress; Migration or emigration of species; Environmental degradation (any five).
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