Which of the following best represents the trophic efficiency of an ecosystem?

The pyramid of energy is the best representation of an ecosystem because it correctly indicates the trophic efficiency of an ecosystem. Transfer of energy follows 10 per cent law – only 10 per cent of the energy is transferred to each trophic level from the lower trophic level. Pyramid of energy is always upright and best represent the trophic efficiency. Pyramid of biomass is inverted in case of aquatic ecosystem. Pyramid of numbers is inverted in the case of food chains involving parasites or in the case of a single tree ecosystem. Age pyramid represents the growth status of a single population.