Gce Model Questions Vol1 2020 Agricultural Science Question 15

Practice objective / multiple choice question 15 from the 2020 Gce Model Questions Vol1 Agricultural Science examination.

Gce Model Questions Vol1 2020 Agricultural Science Objective / Multiple Choice Hard Difficulty
Question 15 GCE_MODEL_QUESTIONS_VOL1 • 2020 • AGRICULTURAL_SCIENCE • objective

Fish in a lake follow logistic growth \(\frac{dN}{dt}=rN\left(1-\frac{N}{K}\right)\) with intrinsic rate \(r=0.4\) yr\(^{-1}\) and carrying capacity \(K=20\,000\) fish.\n\n(a) Calculate the maximum sustainable yield (MSY) and the equilibrium population size at MSY.\n\n(b) If the fishery harvests 3000 fish per year, determine the equilibrium population size and state whether the harvest is sustainable.

Answer Options

Correct Answer A. MSY = 2000 fish/yr, equilibrium at MSY = 10 000 fish; harvest of 3000 fish/yr gives no positive equilibrium - unsustainable
B. MSY = 1500 fish/yr, equilibrium at MSY = 10 000 fish; harvest of 3000 fish/yr gives no positive equilibrium - unsustainable
C. MSY = 2500 fish/yr, equilibrium at MSY = 12 000 fish; harvest of 3000 fish/yr gives a positive equilibrium - sustainable
D. MSY = 2000 fish/yr, equilibrium at MSY = 8 000 fish; harvest of 3000 fish/yr gives a positive equilibrium - sustainable
Correct Answer
A
Correct Option:
MSY = 2000 fish/yr, equilibrium at MSY = 10 000 fish; harvest of 3000 fish/yr gives no positive equilibrium - unsustainable

About This Question

This is Gce Model Questions Vol1 2020 Agricultural Science Question 15. It is one of the objective questions from the 2020 Gce Model Questions Vol1 Agricultural Science examination.

Difficulty level: Hard .

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