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Introduction to Food Chains


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Introduction to Food Chains

  1. 1. What is a food chain?
  2. 2. What is a food chain? <ul><li>A food chain is a way of thinking about how plants and animals in an ecosystem are connected. </li></ul>Food chains trace the flow of energy through an ecosystem
  3. 3. All energy comes from the Sun <ul><li>In almost every food chain on Earth, the energy comes from the Sun </li></ul>
  4. 4. Producers <ul><li>Green plants are producers . They use sunlight to make their own food. </li></ul>
  5. 5. Consumers <ul><li>Consumers do not make their own food. They depend on other organisms to live. </li></ul>
  6. 6. Primary consumers <ul><li>Some animals are primary consumers . They eat plants or parts of plants to survive. </li></ul>A butterfly drinks nectar from flowers .
  7. 7. Primary consumers <ul><li>Some animals are primary consumers . They eat plants to survive. </li></ul>A sheep eats grass. Can you think of any other primary consumers?
  8. 8. Primary consumers <ul><li>Primary consumers that eat only plants are called herbivores. </li></ul>
  9. 9. Secondary consumers <ul><li>Secondary consumers eat other animals. </li></ul>They are predators!
  10. 10. Predators <ul><li>Predators are animals that eat other animals. The other animals are their prey . </li></ul>What predators and prey do you know?
  11. 11. Tertiary consumers <ul><li>Tertiary consumers are predators that eat other predators </li></ul>Animals that only eat meat are called carnivores
  12. 12. A pond food chain <ul><li>The Sun </li></ul>Duckweed Mayfly nymph Frog Owl Which is the producer? The consumers?
  13. 13. Think about it! <ul><li>A frog eats insects. Is it a producer, or a consumer? </li></ul>A frog is a consumer. It does not make its own food.
  14. 14. Think about it! <ul><li>Lily pads make their own food. Are they producers, or consumers? </li></ul>Lily pads are producers. They make their own food.
  15. 15. Think about it! <ul><li>Which would you expect to find more of in an ecosystem—producers, or consumers? </li></ul>You would find more producers, or green plants. All ecosystems must have more producers than consumers.
  16. 16. You are a part of the food chain! <ul><li>Can you think of how you are a part of the food chain? </li></ul>The Sun Tomatoes You! Are people producers, or consumers?
  17. 17. What have you learned? <ul><li>What have you learned about food chains? </li></ul>
  18. 18. By Emily Kissner