Energy flow presentation
6
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.
description
7th grade energy flow
Transcript of Energy flow presentation
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.
1. 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
3rd level consumers mostly carnivores & some omnivores
2nd level consumer carnivores & omnivores
1st 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.
