food chain, inecology, the sequence of transfers of matter and energy in the form of food from organism to organism. Food chains intertwine locally into afood web because most organisms consume more than one type of animal orplant. Plants, which convertsolar energy to food byphotosynthesis, are the primary food source. In apredator chain, a plant-eating animal is eaten by a flesh-eating animal. In aparasite chain, a smaller organism consumes part of a larger host and may itself be parasitized by even smaller organisms. In asaprophytic chain, microorganisms live on dead organic matter.

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Because energy, in the form of heat, is lost at each step, ortrophic level, chains do not normallyencompass more than four or five trophic levels.People can increase the total food supply by cutting out one step in the food chain: instead of consuming animals that eat cereal grains, the people themselves consume the grains. Because the food chain is made shorter, the total amount of energy available to the final consumers is increased.