Introduction to Food Chains


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  • The exceptions are food chains deep under the ocean, clustered around deep sea vents. Scientists were astonished to find that there were food chains based on bacteria that could synthesize food from sulfur compounds.
  • Pronunciation note: Ter-shee-ary
  • 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