Gce Model Questions Vol1 2019 Biology Question 47

In a lake ecosystem, primary producers fix \(1200\) g of carbon per m\(^2\) per year. Ten percent of this primary production is consumed by herbivores. Twenty percent of the herbivore production is then consumed by primary carnivores, and fifteen percent of the primary‑carnivore production is consumed by secondary carnivores.\n\n(a) What proportion of the original primary production ends up in the secondary carnivores? Express your answer as a percentage to one decimal place.\n(b) If the efficiency of herbivore consumption rises to \(15\%\) (all other percentages unchanged), what is the new proportion of the original primary production that reaches the secondary carnivores? Express your answer as a percentage to one decimal place.