Gce Model Questions Vol1 2025 Biology Question 9
Practice objective / multiple choice question 9 from the 2025 Gce Model Questions Vol1 Biology examination.
In a lake ecosystem primary producers generate 10 000 MJ of energy each year. Energy transfer efficiency between successive trophic levels is 10 %. A particular fish species is a secondary consumer that obtains 5 % of the energy available at its trophic level. A pollutant reduces primary production by 20 % and also causes a 30 % mortality in the fish population. Assuming the remaining fish retain the same per‑capita energy intake, calculate the percentage change in the total energy available to the fish species after the pollutant impact (give the magnitude of decrease as a positive percentage).
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This is Gce Model Questions Vol1 2025 Biology Question 9. It is one of the objective questions from the 2025 Gce Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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