Food chain

If you do, you will need energy.

Food chain

Food Theme Page Every organism needs to obtain energy in order to live.

Food chain

For example, plants get energy from the sun, some animals eat plants, and some animals eat other animals. A food chain is the sequence of who eats whom in a biological community an ecosystem to obtain nutrition.

A food chain starts with the primary energy source, usually the sun or boiling-hot deep sea vents. The next link in the chain is an organism that make its own food from the primary energy source -- an example is photosynthetic plants that make their own food from sunlight using a process called photosynthesis and chemosynthetic bacteria that make their food energy from chemicals in hydrothermal vents.

These are called autotrophs or primary producers. Next come organisms that eat the autotrophs; these organisms are called herbivores or primary consumers -- an example is a rabbit that eats grass.

The next link in the chain is animals that eat herbivores - these are called secondary consumers -- an example is a snake that eat rabbits. In turn, these animals are eaten by larger predators -- an example is an owl that eats snakes. The tertiary consumers are are eaten by quaternary consumers -- an example is a hawk that eats owls.

Each food chain end with a top predator, and animal with no natural enemies like an alligator, hawk, or polar bear. The arrows in a food chain show the flow of energy, from the sun or hydrothermal vent to a top predator.

As the energy flows from organism to organism, energy is lost at each step. A network of many food chains is called a food web. The trophic level of an organism is the position it holds in a food chain. Primary consumers are animals that eat primary producers; they are also called herbivores plant-eaters.

Secondary consumers eat primary consumers. They are carnivores meat-eaters and omnivores animals that eat both animals and plants. Tertiary consumers eat secondary consumers.

Quaternary consumers eat tertiary consumers.

The Sources of the Energies That Fuel the Cycle

Food chains "end" with top predators, animals that have little or no natural enemies. When any organism dies, it is eventually eaten by detrivores like vultures, worms and crabs and broken down by decomposers mostly bacteria and fungiand the exchange of energy continues.

For example, when a bear eats berries, the bear is functioning as a primary consumer. When a bear eats a plant-eating rodent, the bear is functioning as a secondary consumer. When the bear eats salmon, the bear is functioning as a tertiary consumer this is because salmon is a secondary consumer, since salmon eat herring that eat zooplankton that eat phytoplankton, that make their own energy from sunlight.

In any food web, energy is lost each time one organism eats another. Because of this, there have to be many more plants than there are plant-eaters.In a food chain, each organism occupies a different trophic level, defined by how many energy transfers separate it from the basic input of the chain.

Food webs consist of many interconnected food chains and are more realistic representation of consumption relationships in ecosystems.

The Food Chain. Every living thing needs energy in order to live. Everytime animals do something (run, jump) they use energy to do so.

Food chain

Animals get energy from the food they eat, and all living things get energy from food. · In addition to ecosystems and food chains, these printable worksheets also cover consumers and producers, as well as herbivores, carnivores, and omnivores.

Common Core alignment can be viewed by clicking the common core. Food Web Worksheet FREE Learn how energy is transferred from one living thing Food chain definition is - an arrangement of the organisms of an ecological community according to the order of predation in which each uses the next usually lower member as a food source.

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Food chains & food webs (article) | Ecology | Khan Academy