Grain is eaten by cows, and cows are eaten by humans. If the ecological transfer efficiency between each trophic level is 10 percent, how much grain is required to produce 70 kg of human biomass?

Question

Quizplus · Accepted Answer

Ecological transfer efficiency is 10%, so 10% of the grain eaten by cows is transferred to cow biomass, and 10% of the cow biomass eaten by humans is transferred to human biomass. Therefore, to produce 70 kg of human biomass, 70/0.1/0.1 = 70,000 kg of grain is required.

Grain Is Eaten by Cows, and Cows Are Eaten by Humans