Gce Model Questions Vol1 2019 Agricultural Science Question 39
Practice objective / multiple choice question 39 from the 2019 Gce Model Questions Vol1 Agricultural Science examination.
A lake's tilapia population follows logistic growth \(\dfrac{dN}{dt}=rN\left(1-\dfrac{N}{K}\right)\) with intrinsic rate \(r=0.5\) yr⁻¹ and carrying capacity \(K=80{,}000\) fish. The fishery currently harvests a constant number \(H\) fish per year and the population has settled at a stable equilibrium of 40 000 fish.\n\n(a) Find the current harvest level \(H\) (fish yr⁻¹).\n(b) A new regulation cuts the harvest by 20 % but a disease raises the natural mortality, reducing the effective \(r\) to 0.4 yr⁻¹. Will the population increase, decrease or stay the same? Give the new equilibrium population (nearest fish) and state whether it is above, below or equal to the previous equilibrium.
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This is Gce Model Questions Vol1 2019 Agricultural Science Question 39. It is one of the objective questions from the 2019 Gce Model Questions Vol1 Agricultural Science examination.
Difficulty level: Hard .
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