1. Energy Flow in Food Chains, Food Webs, & Energy Pyramids

2. What does a food chain show us?
Essential Question
What does a food chain show us?

3. How is a food web different from a food chain?
Essential Question
How is a food web different from a food chain?

4. How is a food chain or food web related to owl pellets?
Essential Question
How is a food chain or food web related to owl pellets?

5. How does energy flow through an ecosystem?
Essential Question
How does energy flow through an ecosystem?

6. Essential Question
How does the amount of energy change as it moves through an energy pyramid?

8. Food chains use pictures or words and arrows to show the movement of energy through the trophic levels of organisms.
The trophic level of an organism indicates the position that the organism occupies in the food chain.
It shows what it eats and what eats it.

9. Producers, Consumers, & Decomposers

11. Why does this look more like a “cycle” than a chain?
Let’s discuss this one in detail.

12. This picture shows the trophic levels.

13. Food webs describe the organisms found in interconnecting food chains using pictures or words and arrows.

16. Energy Pyramids
An energy pyramid shows the amount of energy that moves from one trophic level to another in a food chain.
The most energy is available at the producer level of the pyramid.
The availability of energy decreases as it moves up the energy pyramid.

17. The most energy is at the producer level – the base of the pyramid.

20. The Energy Pyramid

21. Who needs the most energy to survive?