Food chains and food webs
Food chains and food webs We Are Learning To… …use words correctly to describe feeding relationships between animals and plants. …show how energy flows through food chains …interlink food chains to form food webs What I’m Looking For: 1. Construct your own food chain 2. Spot at least two food chains from a food web 3. Point arrows in the right direction in a food chain 4. Construct a food web in a group 5. Be able to answer quiz at the end Trout Kingfisher Pondweed Minnow (little fish) Insect larvae Heron Pondweed Insect larvae Minnow (little fish) http://www.riverlee.org.uk/science/scie-02/scie-02a.htm Kingfisher Your turn • In pairs write down two food chains. • Perhaps one of the organisms in it could be you! • (Hopefully not being eaten by a wolf ) • Draw in arrows pointing from the thing being eaten to the thing eating it. Pondweed Insect larvae Minnow (little fish) Kingfisher Energy Flow Which way does the energy flow? • Which way do the sun’s rays go? What is it used for? How is the sun’s energy used? Plankton & Algae Food chain: a flow of energy in a habitat Sun allows grass to grow Grass is eaten by Rabbits which are eaten by Owls Food chain: a flow of energy in a habitat Grass is eaten by Rabbits which are eaten by Owls Food chain: a flow of energy in a habitat Grass is eaten by Rabbits which are eaten by Owls Grass Rabbit Owl The arrow means ‘is eaten by’ and always goes towards the consumer Except that Owls also eat Shrews as well as Rabbits Shrew Owl Grass Rabbit Shrews also eat other plant matter as well as Grass Plant matter Shrew Grass Rabbit Owl Shrews also have to watch out for weasels that might eat them Weasel Plant matter Grass Shrew Owl Rabbit And snails and worms eat the plant matter too. Weasel Plant matter Grass Worm Snail Shrew Owl Rabbit Food Chain to Food Web Let’s complete ours with hedgehogs (that eat snails & worms) and foxes (that eat pretty much anything that moves!) Weasel Plant matter Grass Worm Snail Shrew Owl Rabbit Hedgehog Fox How many food chains are there now? Weasel Plant matter Grass Worm Snail Shrew Owl Rabbit Hedgehog Write down as many as you can in 3 minutes! Fox Plant matter Shrew Weasel Fox Grass Shrew Weasel Fox Plant matter Shrew Owl Grass Shrew Owl Plant matter Worm Hedgehog Fox Plant matter Snail Hedgehog Fox Grass Rabbit Fox Grass Rabbit Fox Food Chain to Food Web The original food chain has expanded into a food web with 8 interlinked chains as more organisms have been added Food webs are normal in natural habitats as there is nearly always more than one organism that eats something else. Some Key Words • Producer • Consumer –Herbivore –Carnivore –Omnivore CARNIVORES PRODUCERS OMNIVORES HERBIVORES Your turn • In groups of four use the pictures in the envelopes to make your own food webs. • Start off with individual food chains • Then try to link them together to make a food web. • Draw in some arrows – the right way round! CARNIVORE HERBIVORE PRODUCER Kingfisher Oak Plankton Squirrel Daffodil Mouse Snail Fox Tree Well Done Everyone! What We Have Done: 1. Constructed food chains 2. Spotted at least two food chains from a food web 3. Point arrows in the right direction in a food chain 4. Constructed a food web in a group 5. Answered quiz at the end HERBIVORES CARNIVORES Caterpillar Mouse Woodlouse Owl Snake Insect larvae Plankton Snail Pondweed Dead material Beetles Spiders Fish Greenfly Hawthorn Dead material Woodlouse Small bird Hawk Weasel PRODUCERS Woodland Pond Hedgerow Oak Grass Small plants Dead material
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