Gce Model Questions Vol1 2017 Agricultural Science Question 27
Practice objective / multiple choice question 27 from the 2017 Gce Model Questions Vol1 Agricultural Science examination.
A lake fish population follows logistic growth \( \frac{dN}{dt}= rN\left(1-\frac{N}{K}\right) \) with intrinsic rate \( r = 0.5\ \text{yr}^{-1} \) and original carrying capacity \( K_{0}=200{,}000 \) fish.\n\n(a) Determine the maximum sustainable yield (MSY) and the corresponding constant annual harvest \( H \).\n\n(b) Eutrophication raises the carrying capacity by \(25\%\) (so \( K_{1}=1.25K_{0}\) ) while the harvest remains at the value found in part (a). Calculate the new equilibrium population size and state whether the harvest is now above, below, or at the sustainable level for the altered ecosystem.
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This is Gce Model Questions Vol1 2017 Agricultural Science Question 27. It is one of the objective questions from the 2017 Gce Model Questions Vol1 Agricultural Science examination.
Difficulty level: Hard .
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