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Answers. 1  A food chain is the what animal eats what animal. It really should be called a food web because many animals eat many other animals. The food web is a representation of an energy pyramid. An energy pyramid just shows where the energy is going. The sun is at the bottom, then plants and so on. There really are not many differences between them.
It is standard practice to place producers at the bottom of the pyramid, with primary consumers, secondary consumers, tertiary consumers etc above them. The width of each bar should be proportional to the quantity that is being displayed, and the height is usually the same for each bar. It is possible to produce pyramids to describe either a food chain or a food web. In the case of a food web, all the producers, primary consumers, secondary consumers, tertiary consumers are lumped together (into the appropriate categories!) Food pyramids are often used in order to show the efficiency of transfer from one trophic level to the next. Just as in constructing a building, a broad and firm foundation is necessary if the upper layers are to be properly supported.