Neco Model Questions Vol1 2025 Biology Question 30

Two terrestrial ecosystems are studied. Ecosystem A has a gross primary productivity (GPP) of 2000 g C·m\(^{-2}\)·yr\(^{-1}\) and autotrophic respiration of 800 g C·m\(^{-2}\)·yr\(^{-1}\). Herbivores consume 300 g C·m\(^{-2}\)·yr\(^{-1}\) and carnivores consume 100 g C·m\(^{-2}\)·yr\(^{-1}\).\nEcosystem B has a GPP of 1500 g C·m\(^{-2}\)·yr\(^{-1}\) and autotrophic respiration of 500 g C·m\(^{-2}\)·yr\(^{-1}\). Herbivores consume 400 g C·m\(^{-2}\)·yr\(^{-1}\) and carnivores consume 150 g C·m\(^{-2}\)·yr\(^{-1}\).\nCalculate the net primary productivity (NPP) for each ecosystem, the trophic transfer efficiency from producers to herbivores and from herbivores to carnivores, and state which ecosystem has the higher overall trophic transfer efficiency (expressed as a percentage).