Food Chains, Food Webs and Food Pyramids

Food Chains, Food Webs and Food Pyramids

A food chain is a linear sequence of links in a food web starting from species that are called producers in the web and ends at species that are called decomposers in the web.
A food chain also shows how the organisms are related with each other by the food they eat. Below show how food energy moves from producers to tertiary consumers.

Food webs show that animals in a community eat more than one thing. Food webs are made up of many food chains.

Food pyramids - when an animal is at the top of the food chain, it is rarely if ever eaten by another animal.
Humans, eagles and lions are examples of animals found at the top of a food chain or food pyramid.
A food pyramid is similar to a food chain, except a pyramid also shows the number or total biomass of plants and animals. Biomass is the dry mass of the organisms in a food pyramid. It measures how much the plants and animals in a food chain would weigh if they were dried out, leaving only biological material.