Feeding

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Feeding

  1. 1. Feeding Relationships <ul><li>A food chain shows a simple feeding relationship. </li></ul><ul><li>Sun -> </li></ul><ul><li>All food chains start with the sun </li></ul>
  2. 2. Feeding Relationships <ul><li>A food chain shows a simple feeding relationship. </li></ul><ul><li>Sun -> grass -> </li></ul>
  3. 3. Feeding Relationships <ul><li>A food chain shows a simple feeding relationship. </li></ul><ul><li>Sun -> grass -> rabbit -> </li></ul>
  4. 4. Feeding Relationships <ul><li>A food chain shows a simple feeding relationship. </li></ul><ul><li>Sun -> grass -> rabbit -> fox </li></ul>
  5. 5. All food chains start with ENERGY from the sun
  6. 6. carbon dioxide from the air energy from sunlight (or light) water from the roots food transported to the rest of the plant
  7. 7. carbon dioxide from the air energy from sunlight (or light) water from the roots food transported to the rest of the plant Photosynthesis
  8. 8. Because plants produce their own food, they are called ‘Producers’
  9. 9. <ul><li>The energy is then passed on to animals when they eat the plant. </li></ul>
  10. 10. <ul><li>Animals of all shapes… </li></ul>
  11. 12. … and sizes!
  12. 13. Because these animals are the first to take the food energy from the plants, They are called primary consumers
  13. 14. Some of these primary consumers have predators . Other animals that feed on them
  14. 15. Aphids are eaten by….
  15. 16. Ladybirds
  16. 17. Animals that eat primary consumers are called secondary consumers
  17. 18. <ul><li>So far this is a straightforward food chain </li></ul><ul><li>Sun -> aphid -> ladybird </li></ul><ul><li>But in reality it is more complicated than that </li></ul>
  18. 19. This bird eats ladybirds and aphids
  19. 20. This bird eats smaller birds, mice, and rabbits
  20. 21. Mice and rabbits have other predators
  21. 22. What will eat the frog? What do you think the frog eats?
  22. 23. Sometimes it’s not entirely clear who eats who!
  23. 24. We can show what goes on with the help of a Food Web
  24. 25. What would happen if a disease killed off many of the hawks?
  25. 26. There will be nothing to eat the snakes, so their numbers will increase.
  26. 27. All the frogs get eaten
  27. 28. No frogs. More crickets
  28. 29. Most of the cattail gets eaten by the crickets
  29. 30. Now the crickets don’t have enough food so their numbers go down
  30. 31. ..and so on. Numbers of each species have an effect on the numbers of the other species in the web.
  31. 32. This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.

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