Two ecosystems, A and B, have the same primary productivity of $20{,}000$ kcal. In ecosystem A, $10\%$ of the energy is transferred from producers to primary consumers, $15\%$ from primary to secondary consumers, and $10\%$ from secondary to tertiary consumers. In ecosystem B, the transfer efficiencies are $12\%$, $10\%$, and $8\%$ for the same successive trophic levels. Calculate the amount of energy (in kcal) available to tertiary consumers in each ecosystem and state which ecosystem provides more energy at that level, giving the difference.

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Ecosystem A provides 30 kcal to tertiary consumers, Ecosystem B provides 19.2 kcal; Ecosystem A provides 10.8 kcal more.

Neco 2023 Biology Question 47

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