Igcse Model Questions Vol1 2017 Biology Question 37
Practice objective / multiple choice question 37 from the 2017 Igcse Model Questions Vol1 Biology examination.
A lake ecosystem has the following energy‑transfer efficiencies: primary consumers (zooplankton) acquire 10 % of producer biomass; secondary consumers (small fish) acquire 15 % of zooplankton biomass; tertiary consumers (large fish) acquire 20 % of small‑fish biomass. The standing biomass of primary producers is 5 000 g m⁻². A pollutant reduces the primary‑producer biomass by 30 % and also lowers the efficiency of primary consumers to 5 %. (a) Calculate the new standing biomass of tertiary consumers (g m⁻²). (b) By what percentage does this differ from the original tertiary‑consumer biomass?
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This is Igcse Model Questions Vol1 2017 Biology Question 37. It is one of the objective questions from the 2017 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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