1. Energy in Ecosystems

2. Read
Page 32 – 33

3. Answering the following questions:
What is the source of all energy on planet Earth?
What is photosynthesis?
What percentage of the Sun’s energy is used by photosynthesis?

4. Read pg

5. Definitions Primary consumer Trophic level Secondary consumer
Tertiary consumer
Food chain
Food web
Biodiversity
Top carnivore
Trophic level
Producers/ autotrophs
Consumers/Heterotrophs
Textbook Questions on page 39
Questions: 1-7, 9-10, 14

6. The Sun
Source of energy for (almost) all ecosystems

7. Trophic Levels Each step in a food chain
Means “feeder level” (from Greek etymology)

8. Producer/autotroph Organisms that produce their own food (energy)
Means “self feeders”
First trophic level

9. What is your favourite food?
Why do we eat food?

10. Consumer / Heterotroph
Organisms that eat other organisms to obtain energy

11. Primary consumers Second trophic level
Producers are their source of energy
AKA herbivores

12. Secondary Consumers Third trophic level
Primary Consumers are their source of energy
AKA Carnivores

13. Tertiary Consumers Fourth trophic level
Secondary consumers are their source of energy
AKA Carnivores

14. Detrivores/ Decomposers
Detritus (dead organic matter) is their source of energy
Feed at every trophic level
Very important for nutrient cycling in ecosystems

15. Food Chain vs Web

16. Food Chain
a one way flow of energy showing whom eats whom in an ecosystem.

17. Food Web
Shows a feeding relationship between organisms in an ecosystem (often multiple connections per organism, i.e. multiple food chains)
More accurate – what would happen if you only ate one type of food???

18. Biodiversity
The variety of different types of species found within an ecosystem

19. Top Carnivore A consumer who has no predators
Found at the top of food webs

20. Students are to label with
autotroph or heterotroph
Producer or consumer
Primary consumer
Secondary consumer
Tertiary consumer
Quaternary consumer
Herbivore, carnivore, top carnivore
How many trophic levels are there?
Which trophic level does the plants occupy?
Which trophic level does the owl occupy?

21. Some more definitions 
Herbivores – “plant eaters”
Carnivores – “meat eaters”
Omnivores – eats both plants and animals
Detrivores – feed on detritus (dead organic matter) and poop. Feed at every trophic level.

22. What is your favorite animal?
Illustrate a food chain to include your favourite animal! Must have at least four trophic levels!