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A food chain shows the relationship between which feed on each other . This essay will describe the three types of organisms which form food , and explain how each organism acts as a food for the next one in the chain . The first organism in the food chain cannot feed on other organisms and is called a because it makes its own food . Green plants are an example of a producer . They use photosynthesis , that is , the process of turning carbon dioxide and water into organic compounds using energy from . These organic compounds are found in various parts of the plant such as the leaves , fruit , and , and are a source of energy for the organism in the next step in the chain , a . Consumers are generally animals and humans who eat the products of photosynthesis . Examples of this are sheep eating grass , and birds eating seeds . Consumers are classified depending on their place in the chain . For instance , when humans eat vegetables , they are primary consumers . In other words , they are directly eating a product of photosynthesis . When they eat meat , they are consumers . Consumers can also be divided into groups according to what they eat : , which eat only plants or plant products , carnivores , which eat animals , and , which eat both plants and animals . The transfer of energy from one species to another can occur several times , but eventually the chain ends . When the final consumer dies , its body is broken down into simple molecules by decomposers such as and fungi , in the final steps in the chain . These molecules are returned to the soil , where they are used by plants , and the food chain begins again . To summarize , a food chain shows that every organism is on another for its source of energy , and in turn acts as a food source for the next organism in the chain .