1. WARM UP
5 Min
DNA Questions:
Explain the difference between biotic & abiotic factors
Energy flows through an ecosystem in ______ direction(s) :

2. “Ecological Pyramids”
Ch. 3 Sec 2 Notes
“Ecological Pyramids”

3. Learning Objectives
2 Min
explain how an energy pyramid shows the energy transferred and lost in an ecosystem.
identify the trophic levels in an ecological pyramid.
distinguish between the 3 types of ecological pyramids.

4. Energy Pyramid
2 Min
Illustrates how stored energy is passed from one organism to another
0.1% Third-level consumers
1% Second-level consumers
10% First-level consumers
100% Producers

5. Energy Pyramid continued…
2 Min
Energy Transferred
typically only 10 percent of energy from the previous level is passed on to the consumer
Energy Lost
At every level in a food web, an organism uses energy metabolically to survive and grow, but much is released as heat about 90 percent

6. Energy Pyramid cont…
2 Min

7. Test Your Knowledge! In an energy pyramid…
30 sec
In an energy pyramid…
How much energy is lost at each level?
10% of energy is _____ to the next trophic level when the lion consumes the zebra.

8. Trophic Levels
2 Min

9. Trophic Levels Wild! In the pyramid the top level consumer is the ___
30 sec
In the pyramid the
top level consumer is the ___
primary producer is ____
secondary consumer is ____

10. Biomass Pyramid
2 Min

11. Pyramid of Numbers
2 Min
Shows the relative number of individual organisms at each trophic level.

12. Name that Pyramid… Shows 50 grams of platypus/meter2
30 sec
Shows 50 grams of platypus/meter2
Shows only 10% of energy is transferred from grass to the bunny that eats it
Shows that 1 great white shark eats 20 seals

13. Food Webs These show who eats who.
There are simple ones and complex ones.
This is a 
A complex one is
on the wall.

14. Ch. 3 Sec 2 Summary Take a moment to reflect on what you learned today
5 Min
Take a moment to reflect on what you learned today
You have 5 minutes to write a summary.
Use your learning objectives to help you.

15. Ch. 3 Sec 2 Reflection Glue into notebook
15 Min
Glue into notebook
Use your notes, & the textbook to help you answer the questions
You have minutes to complete the Reflection review.