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Energy flow presentation
 

Energy flow presentation

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7th grade energy flow

7th grade energy flow

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  • When a cricket eats a plant it uses about 90% of the calories from that plant to move, digest, produce body heat, reproduce and escape from predators. When a snake eats a cricket or a chipmunk, it uses about 90% of those calories to move, digest, produce body heat, reproduce and escape from predators. When a top predator like a cougar, bear or spotted owl eats a flying squirrel, frog or salmon, it uses about 90% of those calories to move, digest, produce body heat and reproduce.

Energy flow presentation Energy flow presentation Presentation Transcript

  • At each level of the food chain, about 90% of the energy is lost in the form of heat. The total energy passed from one level to the next is only about one-tenth of the energy received from the previous organism. Therefore, as you move up the food chain, there is less energy available.
    • The sun has one liter of rootbeer (energy) to give.
    • 2. Of that, the plant gets one-tenth or 100 milliliters.
    • 3. The mouse gets 10 milliliters from the plant.
    • 4. The hawk gets 1 milliliter from the mouse.
    • 5. When the hawk dies and is decomposed by the mushroom, the mushroom gets only one-tenth of a milliliter!
    Rootbeer Activity
  • Sun has 1 liter (1000 ml) Plant receives -100 ml Plant has 100 ml Mouse receives 10 ml Mouse has 10 ml Hawk Receives 1 ml Hawk dies has 1 ml Decomposers receive . 1 ml
  • Energy Pyramids show the flow of energy through an ecosystem Ecologists study energy pyramids
  • 3 rd level consumers mostly carnivores & some omnivores 2 nd level consumer carnivores & omnivores 1 st level consumer herbivores Producers: green plants make their own energy from sunlight 10,000 Kcal 1000 Kcal 100 Kcal 10 Kcal 1 Kcal An energy pyramid from the Andrews
  • 10,000 Kcal 1000 Kcal 100 Kcal 10 Kcal 0.1% 1% 10% 100% 1 Kcal 0.01% When an owl eats a flying squirrel it uses about 90% of the calories to live— move, digest, produce body heat, reproduce and escape from predators. When a frog eats a cricket or a cricket eats a plant, they use 90% of those calories to move, digest, produce body heat, reproduce and escape from predators.