1. CHAPTER 3.2 Part I
ENERGY FLOW

2. I.WHERE DOES THE ENERGY COME FROM FOR EVERY ORGANISM TO INTERACT
A. SUNLIGHT is the main energy source for LIFE
1. Less than 1% of the sunlight is used by living things
2. Photosynthesis – the process of obtaining light energy to make food.
B. CHEMICALS are another source of energy
1. Some bacteria can convert energy from chemicals through a process called chemosynthesis

4. II. WHO MAKES THE ENERGY A. AUTOTROPHS (PRODUCERS)
1. Plants (Sunlight)
2. Some Algae (sunlight)
3. Some Bacteria (breaking down chemicals – where
no sunlight is found)
B. Without AUTOTROPHS or a constant input of energy, living things cannot function (live)

5. III. WHO USES THE ENERGY MADE FROM PRODUCERS
A. CONSUMERS or HETEROTROPHS
1. They rely on other organisms for
food and energy
2. Animals, Fungi, bacteria, protists

6. B. 5 TYPES of CONSUMERS Eat plants HERBIVORE Eat Animals (meat)
Eat Animals and Plants
Feed on dead matter (detritus)
Break down organic matter or dead things
HERBIVORE
CARNIVORE
OMNIVORE
DETRITIVORE (scavenger)
DECOMPOSER

7. IV. ENERGY FLOW!!!! A. FOOD CHAIN – energy stored by producers
can be passed on through an ecosystem along
a food chain.
B. FOOD WEB – combination of food chains in
an ecosystem

8. Think-Pair-Share
Do you think we could survive without producers? Why or Why not?

10. V. TROPHIC LEVELS
1. Each step in a food chain or web is called a trophic level
2. Producers are always in the first trophic level
3. Herbivores or omnivores are in the second
trophic level
4. Other consumers (omnivore or carnivore) are
in third, fourth,… higher trophic level.

11. VI. Levels of Consumer- Depends on Food Chain – what was just eaten
1. 1st Order Consumer - eats producer (2nd TL)
2. 2nd Order Consumer – eats 1st order
consumer
3. 3rd Order Consumer – eats 2nd order
4. 4th order consumer…

13. Where do the arrows point?
What level of consumer are they?
What are the trophic levels?
Level of Consumer
1st -Order
2nd - Order
3rd- Order
Trophic level
1st TL
2nd T.L.
3rd T.L
4th T.L
Level of Consumer
2nd -Order
1st - Order
Trophic level
3rd TL
2nd TL
1st TL

14. Food Webs
3rd Trophic Level
2nd Trophic Level
1st Trophic Level

15. The top of the food chain. HUMAN – can you think why?
Some animals are said to be at the top of the food chain. This is because they are not hunted by other animals.
What are some examples?
LION - Can you think why?
HUMAN – can you think why?
HAWK – Can you think Why?

16. Breaking the Chain Organisms living in a habitat depend on each other.
If one part of a food chain dies out or is greatly reduced, the consumers have to find alternative food, move away, or starve.
This then affects more consumers in the same way.

17. Plickers
What is the trophic level of an animal that eats a producer called?
A- 1st level
B- 2nd level
C- 3rd level
D- All of the above

18. Plickers
What is the main difference between a food web and a food chain?
A-Food Web is only 1 path
B-Food Chain is multiple paths
C-Food Web is multiple paths
D-There is no difference

19. Plicker What is each step in a food chain or food web called? A-Order
B-Consumer
C-Trophic Level
D- There is no steps

20. Which is not a type of consumer?
A-Carnivore
B-Decomposer
C-Herbivore
D-iwilleatanything-avore