Gce Model Questions Vol1 2020 Biology Question 8
Practice objective / multiple choice question 8 from the 2020 Gce Model Questions Vol1 Biology examination.
In a freshwater lake the annual gross primary productivity (GPP) is 1500 g C m⁻² yr⁻¹. Autotrophic respiration consumes 40 % of the GPP, while heterotrophic respiration is 300 g C m⁻² yr⁻¹. Only 10 % of the net primary production (NPP) is transferred to the next trophic level. A fish species converts the transferred carbon into body mass with an efficiency of 0.5 g C per g fish. Calculate (a) the amount of carbon (g C m⁻² yr⁻¹) available to the second trophic level, and (b) the maximum sustainable fish biomass (g fish m⁻²) that can be supported.
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About This Question
This is Gce Model Questions Vol1 2020 Biology Question 8. It is one of the objective questions from the 2020 Gce Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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