1. The World Wide Web
Food Chains & Food Webs

2. ENGAGE
What is the major difference between a chain and a web?

3. EXPLORE Classroom Food Chain
Hawk??
Berries??
Frogs??
Insects??
Sun??
Snakes??
What is the ultimate source of energy for everything on Earth?
Sun major supplier of the earth’s energy.

4. What is this?

5. Food Chain
The simplest feeding arrangement in an ecosystem.

6. Where do the arrows point?

7. Food Webs Many food chains interacting with each other.
Shows the movement of energy and matter in an ecosystem.

8. Click the following button to complete an activity which demonstrates how a food web works.

9. EXPLORE: Interactions in Ecosystems
Tabizi Python & Clendro Hawks
Using Imaginary Animals to Achieve Real Knowledge About Ecosystems
Science Scope January 2007

10. Categorize Your Cards
Producers
Herbivores
Carnivores

11. Begin Creating Food Chains
Start each food chain with a producer
Neumelinda Tree
Red Tarmal
Tabizi Python
Rahpsheraga

12. Explain The Flow of Energy
What is a producer?
What is a consumer?
Name three different types of consumers.
How does energy flow in a food web?
What is the earth’s major energy supplier?
Energy CANNOT be RECYCLED, it flows through the ecosystem.
Most of the energy released is lost in the form of heat.

13. Biomass

14. Ecological Pyramid

15. Ecological Pyramid

16. Ecological Pyramid Which level has the most energy?
Which level has the most organisms?
Which level has the least organisms?
Which level has the least energy?

17. Ecological Pyramids Energy Pyramid Shows the relative amount of
energy available at each trophic
level. Organisms use about 10
percent of this energy for life processes.
The rest is lost as heat.
Pyramid of Numbers
Shows the relative
number of individual
organisms at each
trophic level.
Biomass Pyramid
Represents the amount of
living organic matter at each
trophic level. Typically, the
greatest biomass is at the
base of the pyramid.

18. Pyramid of Numbers
Carnivore populations are smaller in comparison to the rest of the ecosystem.
They require more food to sustain their lives than the lower organisms.

19. Energy Pyramid (Trophic Levels)
The lowest trophic level of the pyramid represents the producers and contains the most energy.
The second level represents the primary consumers. A 90% decrease in useable energy
The third level or secondary consumers will have 10% of the energy from the level below to use.

20. Let’s Practice How many trophic levels are present? 5
Determine the amount of useable energy for the different trophic levels.
Level 2: 35 J
Level 3: 3.5 J
Level 4: 0.35 J
Level 5: J

23. ELABORATE Tabizi Python & Clendro Hawks
Using Imaginary Animals to Achieve Real Knowledge About Ecosystems
Science Scope January 2007
Event Cards---What happens to the food web when….

24. EVALUATE
The Lorax
List as many interactions as you can while watching or listening to the story.
Create a food web
Draw a biomass pyramid to show the relative amount of living organic matter at each trophic level.