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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.
The Pyramid of Energy in Ecology. The food chain described above can be represented using a pyramid. The four levels of the pyramid are the Primary Producers, the Primary Consumers, the Secondary Consumers and the Tertiary Consumers. Notice that each level is smaller than it would be in a normal pyramid. This indicates that the population size gets smaller as you go up the pyramid. Primary Producers.