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Ci 401 food webs

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Ci 401 food webs

  1. 1. Food chains and food webs
  2. 2. 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
  3. 3. 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
  4. 4. Kingfisher Pondweed Trout Insect larvae Heron Minnow (little fish)
  5. 5. Pondweed Insect Kingfisher larvae Minnow (little fish) http://www.riverlee.org.uk/science/scie-02/scie-02a.htm
  6. 6. 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 Kingfisher larvae Minnow (little fish)
  7. 7. Energy Flow Which way does the energy flow? • Which way do the sun’s rays go? What is it used for?
  8. 8. How is the sun’s energy used?
  9. 9. Plankton & Algae
  10. 10. Food chain: a flow of energy in a habitat Sun allows grass to grow Grass is eaten by Rabbits which are eaten by Owls
  11. 11. Food chain: a flow of energy in a habitat Grass is eaten by Rabbits which are eaten by Owls
  12. 12. 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
  13. 13. Except that Owls also eat Shrews as well as Rabbits Rabbit Owl Shrew Grass
  14. 14. Shrews also eat other plant matter as well as Grass Rabbit Owl Plant Shrew matter Grass
  15. 15. Shrews also have to watch out for weasels that might eat them Rabbit Owl Plant Shrew matter Weasel Grass
  16. 16. And snails and worms eat the plant matter too. Rabbit Owl Plant Shrew matter Worm Snail Weasel Grass
  17. 17. Food Chain to Food Web Let’s complete ours with hedgehogs (that eat snails & worms) and foxes (that eat pretty much anything that moves!)
  18. 18. Rabbit Owl Plant Shrew matter Worm Snail Weasel Grass Hedgehog Fox
  19. 19. How many food chains are there now? Rabbit Owl Plant Shrew matter Worm Snail Weasel Grass Hedgehog Fox Write down as many as you can in 3 minutes!
  20. 20. Plant matter Shrew Fox Grass Shrew Weasel Fox Shrew Plant matter Shrew Owl Worm Snail Weasel Grass Hedgehog Plant matter Plant matter Owl Grass Rabbit Hedgehog Fox Grass Rabbit Fox Fox Fox
  21. 21. 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.
  22. 22. Some Key Words • Producer • Consumer –Herbivore –Carnivore –Omnivore
  23. 23. CARNIVORES HERBIVORES PRODUCERS OMNIVORES
  24. 24. 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!
  25. 25. CARNIVORE WKOPSDieMnalSaqalFgklo nunf DfofuTkiiaosrxsotrridholeeenienlleer HERBIVORE PRODUCER Everyone!
  26. 26. 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
  27. 27. Woodland Pond Hedgerow PRODUCERS HERBIVORES CARNIVORES Oak Grass Small plants Dead material Plankton Pondweed Dead material Hawthorn Dead material Caterpillar Mouse Woodlouse Insect larvae Snail Greenfly Woodlouse Small bird Owl Snake Beetles Spiders Fish Hawk Weasel

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