In relation to ecological pyramids, which one of the following statements is correct?

Pyramid of energy is always upright and can never be inverted because when energy flows from a particular trophic level to the next trophic level, some energy is always lost as heat at each step. 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 biomass is inverted in case of aquatic ecosystem. Pyramid of numbers is inverted in case of parasitic food chains. Pyramid of biomass of a forest is upright.