1. Learning Objectives Identify the source of energy for life processes
Trace the flow of energy through living systems

2. Energy Flow
All living things need energy to survive

3. Sunlight
Sunlight is the main energy source for life on Earth

4. Organisms are divided on how they obtain energy
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Organisms are divided on how they obtain energy
Autotrophs
Heterotrophs

5. Autotrophs
Autotrophs - make their own food for energy using sunlight or chemicals. AKA producers

6. Heterotrophs
Heterotrophs - organisms that rely on other organisms for their energy and food supply. AKA consumers

7. Herbivore
Herbivore - Eats only plants.
Examples: deer, squirrel

8. Carnivore
Carnivore - eats other animals
Example: Tiger, Hawk

9. Omnivore
Omnivore - eats plants and animals
Examples: Humans, Bears

10. Detritivores Detritivores - feeds on the bodies of dead matter
Decomposers - break down organic matter
Scavengers - feed on dead/dying animals

11. Tertiary consumer Secondary consumer Primary consumer Producer
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Tertiary consumer
Secondary consumer
Primary consumer
Producer

12. Three ways to illustrate energy flow:
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Energy Paths
Three ways to illustrate energy flow:
Food Chain
Food Web
Food (Energy) Pyramid

13. Food Chain
A food chain shows the path of energy from one organism to the next. Arrow points in the direction that the energy is flowing

14. Food Web
A food web shows all feeding relationships in an ecosystem (network of many food chains)

15. Food (Energy) Pyramid
A level of the food pyramid is called a trophic level
Food chains/webs can be shown as a food pyramid. Producers at bottom, consumers at upper levels

16. Trophic Levels Energy is lost with each trophic level
~ 90% is released to the environment as heat
~ 10% of the energy is used by organisms

17. Stop Here