The grade 9 biologists have started studying the final grade 9 biology topic on ecosystems and human influences. To model the flow of energy through food chains we roleplayed the transfer of water (energy) from a large bowl (the sun) to a number of cups with holes in them (trophic levels) to find out how much water (energy) passed to the end of the chain. We then evaluated how the roleplay was similar to. energy loss (loss of water) through food chains and how it could be improved (including the role of decomposers). The students left the lesson with a better understanding of the fundamental concept of how not all energy is passed on to the next trophic level and hence why there is a limit to the maximum number of trophic levels in a food chain.