Igcse Model Questions Vol1 2022 Biology Question 1

Ecosystem A receives 2000 MJ m⁻² yr⁻¹ of solar radiation and converts 1 % of it into chemical energy in its primary producers. Herbivores obtain 10 % of the producer energy, secondary consumers obtain 20 % of the herbivore energy and tertiary consumers obtain 15 % of the secondary‑consumer energy. Ecosystem B receives 2500 MJ m⁻² yr⁻¹ and converts 0.8 % of it into producer energy. Its herbivores obtain 12 % of the producer energy, secondary consumers obtain 18 % of the herbivore energy and tertiary consumers obtain 10 % of the secondary‑consumer energy. Which ecosystem supports the greater amount of energy at the tertiary‑consumer level? State the ecosystem (A or B) and the amount of energy (MJ m⁻² yr⁻¹) available to tertiary consumers in that ecosystem.