you are what you eat
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You are What You Eat. Autotroph/producer : An organism that makes its own food. . Plants and some other organisms make food from sunlight energy (photosynthesis). Heterotrophs/consumers: Organisms that get energy directly or indirectly from plants. Types of heterotrophs:.

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autotroph producer an organism that makes its own food
Autotroph/producer:An organism that makes its own food.

Plants and some other organisms make food from sunlight energy (photosynthesis)

types of heterotrophs
Types of heterotrophs:
  • Herbivore: organisms which feed only on autotrophs (plants). Examples: deer, rabbits, horses
2 carnivores
2. Carnivores

Organisms which feed only on other heterotrophs (animals). Examples: wolves, hawks, anteaters

3 omnivores
Organisms which feed on both plants and animals Examples: humans, bears, robins, raccoons

Black rats are omnivores. They will eat grain, fruit, corn, insects and eggs.

3. Omnivores
4 decomposers
Animals which feed on decaying organic matter (rotting plants and animals). Examples: earthworms, fungus, some bacteria

Mushrooms (right) and earthworms are decomposers

4. Decomposers
5 scavengers
5. Scavengers

Animals which feed on other animals which are already dead (scavengers don’t kill their own prey). Examples: hyena, crows, vultures, ants.

make a menu
Make a menu

Create a menu for the five categories of eaters. Your menu should include the various courses that you would find in a typical menu, like appetizers, main courses, specials, desserts, drinks…. You should also include selections for each kind of eater within each category.

  • 100 points- neat, attractive, accurate, at least three items for each group of organism, and at least three sections within the menu (desserts, main courses….)
  • 75 points – neat, accurate, at least two items for each kind of organism.
  • 0 points – sloppy, not accurate, not done in menu format.
Energy Flow


the Ecosystem

Energy moves from the sun to plants to primary consumers (herbivores) to higher consumers (omnivores & carnivores).
  • A food chain shows the movement of energy through a system.
examples of food chains
Examples of food chains
  • Leaf caterpillar robin mosquito
  • Clover deer wolf
  • Minnow salmon bear
  • Grass cow human
  • Fly frog snake alligator
trophic levels
Trophic Levels

Each link in a food chain is a trophic level.

  • Autotroph (beginning of the chain) - first trophic level.
  • Herbivore (eats the autotroph) - second trophic level.
  • Carnivore (eats the herbivore) - third trophic level.
how many trophic levels
How many trophic levels?

Rotting fruitFly frog snake

Which organism is at the second trophic level?

Name the carnivores:

What kind of organism is a fly?

At which trophic level is the snake?

Can anyone in this chain be an omnivore?

Who is the highest order consumer in this chain?

how many trophic levels16
How many trophic levels?

Clover deer wolf

How many carnivores?

How many autotrophs?

Which is at the third trophic level?

At which trophic level is the herbivore?

Name the next link in the chain if the wolf dies and decomposes.

food web
Food Web

A food web shows all the different food chains in an ecosystem.

How many different food chains are in this web?

How many food chains is the mosquito in?
  • What is getting energy from the worm?
  • How many autotrophs are in this web?
  • Is the energy flowing from the alder to the deer, or from the deer to the alder?
What kind of ecosystem would have a food web like this one?

Which predators have the most sources of food in this web?

What is at the beginning of each food chain in this web?

Is the Herring a herbivore, an omnivore or a carnivore?

How many food chains do you see here?

What would happen if the snails were eliminated from this web?

energy pyramid shows the movement of energy through an ecosystem
Energy Pyramid:Shows the movement of energy through an ecosystem
  • Bottom of the pyramid: 1st trophic level: Autotrophs/producers: the most energy is here.
  • Second trophic level: herbivores (first order consumers) are here. Some energy is lost.
  • Third trophic level: omnivores, small carnivores. More energy is lost.
  • Fourth trophic level: top carnivores and omnivores. The least amount of energy is here.

Source of energy for the energy pyramid is The Sun!

Energy is lost as it moves up the pyramid.

The pyramid is like climbing steps: Energy is lost as you move up the stairs

You have the most energy at the bottom

You have the least energy at the top

Because less energy is available to for the consumers at the top, there are less carnivores than plants.
pyramid practice
Place the following species and terms in the correct location on the ecological pyramid: (This will be turned in)


Carrot plant









Least Energy




Secondary Consumer

Primary Consumer

Tertiary Consumer

2nd Trophic Level

3rd Trophic Level

1st Trophic Level

4th Trophic Level

Most energy

Pyramid Practice