1. Complete Part 1 and Part 2 of the worksheet on your desk.
8.L.3.3.Warm-Up
Complete Part 1 and Part 2 of the worksheet on your desk.
Essential Question: How can you create a model of a food chain that showcases the cycling of matter? You should include a summary of how matter is cycled.

2. Activity
Who’s For Dinner: Build a food chain of Antarctic organisms and discover how the chain makes up part of a more complex food web.

3. 8.L.3.3.

4. Food Chain
A series of organisms that shows that each one eats the organism of the lower level.
The arrows point in the direction of the flow of energy.

5. Food Chain: Producers 1st trophic level: Also called autotrophs
Use Sun’s energy to combine CO2 and water to produce glucose and oxygen
Releases oxygen and gains food through photosynthesis

6. Food Chain: Consumers Animals that can’t make their own food
Get food by eating other organisms
Also called heterotrophs
An animal that feeds directly off of producers is a first-order consumer
10% of the energy in one trophic level is passed to the next

7. Food Chain: Herbivores
2nd trophic level:
Eat producers.
Use food for energy and other functions
Most of consumed energy is lost as heat
Include grasshoppers, deer, and rabbits

8. Food Chain: Carnivores
3rd trophic level:
Eat producers and herbivores
Use food energy things necessary for their function
Include humans, wolves, hawks, bears

9. Food Chain: Decomposers
Break down organic matter
Return organic matter (nitrogen and carbon) to environment and make the nutrients available to other animals
Include mushrooms, worms, bacteria, cockroaches

10. Carnivore
3-order consumer
Herbivore
1-order consumer
Carnivore
2-order consumer
Producer
Broken down by
Nutrients are returned to
Carnivore
Decomposer

11. Roles of the trophic levels
As different organisms use the energy in an ecosystem, matter is being cycled.
When producers use CO2 and make oxygen, they cycle matter.
When herbivores and carnivores eat and use their food for their bodies and breath oxygen, they cycle matter.
When decomposers break down this material, they cycle matter back into the soil for producers.

12. Food Web
A food web is made up of many connected food chains that show the flow of energy in ecosystems.

13. Energy goes through various chemical reactions in a food web.
Transfers of matter happen in each trophic level.
When molecules from food react with oxygen, the carbon dioxide and water are transferred back to the environment.
Decomposers play their part by recycling dead plant and animal matter back into the soil or in the water.
Energy in the environment is transferred in the cycle between biotic and abiotic factors.

14. http://app. discoveryeducation. com/search

15. Practice
You will be filling in the food web. In the food web you should write the trophic level, what type of organisms are in that trophic level (herbivores, carnivores, etc.), and a brief description of how they aid in cycling matter.

16. Practice
Answer the questions on the Energy Flow worksheet independently. You can use your notes if necessary.

17. Assessment
Without using your notes, complete the fill in the blank paragraph with your new knowledge and answer the question. This is not group work: work independently!