Find out about food chains and webs in this KS3 Science quiz. A food chain shows the dependency of organisms on other organisms as a source of food. It shows how energy is transferred in a habitat. A food web is just a lot of food chains linked together - it gives a more complete picture of what eats what in a natural habitat. All food chains begin with producers e.g. plants or algae. They produce their own food by the process of photosynthesis and are the source of energy for the entire food chain. Animals in a food chain are called consumers as they need to eat plants and other animals.
An animal that eats only plants is a herbivore and can be referred to as a primary consumer. Animals that eat other animals are either carnivores (only eat other animals, never eat plants) or omnivores (eat both animals and plants). A secondary consumer is an animal that eats herbivores and a tertiary consumer is an animal that eats secondary consumers. As you go up a food chain, there is less and less energy available which is why there are fewer tertiary consumers than secondary consumers.
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You can find more about this topic by visiting BBC Bitesize - Food chains and webs
Plants produce their own food by photosynthesis
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They can also be omnivores
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Herbivores eat plants. Carnivores eat animals (meat)
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The others are herbivores, in other words they are all primary consumers. A lion is a carnivore and is a secondary consumer (or higher, depending on what it has just eaten)
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A food chain always starts with an organism that can photosynthesise
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A food chain ends at the top carnivore
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It eats grasshoppers which are the primary consumers of this food chain
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Nothing eats the hawk - hunting and catching it would take more energy than the predator would get from eating the hawk
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The slugs do not have as much competition when the rabbits have died so there is more slug food. More food means that a larger population of slugs can be supported in the food chain
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The arrows always show which way the energy is passing. In other words, they will always point towards the animal that is doing the eating and away from whatever is being eaten
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