1. Energy Flow in Ecosystems
Food Chains, Food Webs, & Energy Pyramids
Glue in Pages 52L & 53L/R (you will get 52R later)
Change numbers:
52L 54R L 55L R 55R
Check your 4th Six Weeks Grade in Skyward, then put your phone away in the bin or your backpack… if something looks odd/wrong, talk to me before 3:30 today

2. 2 types of ENERGY: Potential = STORED energy
Kinetic = energy in MOTION

3. It all starts with the SUN Photosynthesis = potential (stored) energy
Equation:
CO2 + H2O + sunlight 
C6H12O6 (glucose)+ O2

4. Photosynthesis: the chemical reaction where green plants use water and carbon dioxide and light from the sun to make glucose and oxygen.
ENERGY is stored in glucose

6. Food Chains
Food chains- use pictures or words and arrows to show the movement of energy in an ecosystem
Trophic level- indicates the position that the organism occupies in the food chain
Arrows- point TO the animal that is doing the eating!! (where the energy is going!)

7. Types of Food Chains
Aquatic- Water-related food chains with sea plants and animals
Terrestrial- Land-related food chains with land plants and animals

8. All food chains begin with the SUN!

10. The owl eats the snake that ate the frog that ate the caterpillar that ate the flower.

11. Follow the food chain from producer to top level consumer.
Note: There’s something wrong.
What is it?
Follow the food chain from producer to top level consumer.

12. Fox eats Rabbit that ate plant.

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

14. Why is the SUN in this picture?

15. In this food chain, what is the producer?
What is the first level consumer?
What is the second level consumer?
Is the polar bear the 3rd level consumer? Explain.

17. This picture shows the trophic levels.

18. Trophic
Levels

21. Food Webs Food webs- a group of interconnecting food chains
They describe the complex patterns of energy flow in an ecosystem

22. Find a few food chains in this food web.

24. Find as many food chains as you can!

25. Food Webs are EASY!

26. 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.

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

29. 10% Rule: only about 10% of energy is passed to the next level of the pyramid.
Other 90%??
Gets used by organism or lost as heat energy

30. Units for Energy:
Joules (J), kCal, calories

31. Making a Model Let’s make a model of an energy pyramid.
The model you will construct will be simple. It will show trophic levels, the names of organisms, and the energy available.
Make sure you follow all instructions for proper completion of the model.

32. Instructions In the gray area, write “________’s Food Chain Foldable”
We are going to fill out everything and color everything BEFORE cutting
You need a PEN or MARKER, 4 colored pencils, and scissors
Foldable goes on 56L