Waec Model Questions Vol1 2023 Biology Question 24
Practice objective / multiple choice question 24 from the 2023 Waec Model Questions Vol1 Biology examination.
A bacterial culture follows logistic growth: dN/dt = rN(1 - N/K). The initial population is N₀ = 1 × 10⁶ cells, the carrying capacity K = 1 × 10⁹ cells and the intrinsic growth rate r = 0.8 h⁻¹. An antibiotic is added at t = 2 h, reducing the growth rate by 30 % (so r becomes 0.56 h⁻¹) for the next 4 h; after that the growth rate returns to its original value. What is the population size at t = 8 h? (Give your answer in scientific notation to two significant figures.)
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This is Waec Model Questions Vol1 2023 Biology Question 24. It is one of the objective questions from the 2023 Waec Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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