Food chains and webs show the flow of materials and energy in habitats, but they do not give you any idea of how many organisms there are in the habitat. This lecture briefly present on Food Pyramids. A pyramid of numbers is a diagram showing the numbers of organisms present in each level of a food chain. Finally present on Energy loss in a food chain. Only 10% of energy is passed along to the next level in a food chain. The rest of the energy is lost through: waste, heat, movement and respiration.