Where did your dinner come from? With a partner sitting next to you: List the types of food you ate for dinner

last nightEx. pizza, cheese, pepperoni, breadsticks,

jello

Under each item, write the name of the plant, animal, or other organism that was the source for that food(Some foods have more than one source)

Energy Roles Energy Role: determined by how an

organism obtains energy and interacts with other organismsProducer, consumer, or decomposer

Producers

Producer: an organism that can make its own foodSource of all the food in an ecosystemMost ecosystems obtain energy from

sunlightFew ecosystems obtain energy from gas

Consumers Consumers: an organism that

obtains energy by feeding on other organismsHerbivores: consumers that eat only

plantsCarnivores: consumers that eat only

meatOmnivores: eat both plants and

animals

Decomposers Decomposers: break down wastes and

dead organisms and return the raw materials to the ecosystemNature’s own recyclersEx. Mushrooms and bacteria

Talk to your neighbor!!

What do herbivores and carnivores have in common?

What is the role of decomposers?

What do you know about ecosystems?

Food Chains and Food Webs Food Chain: a series of events in which one

organism eats another in order to obtain energyProducer: first organism- plant First level consumer: second organism, feeds on

the producer, herbivore or omnivore Second level consumer: an organism that eats

the first level consumer, carnivore or omnivore Third level consumer: eats the second level

consumer, also a carnivore

Food Chains and Food Webs A food chain only shows one possible path

of energy flow through an ecosystem. Food Web: many overlapping food chains in

an ecosysteman organism can play more than one role in

an ecosystem

Food chains and food webs can interconnectex. a gull might eat a fish at the ocean and a

mouse at a landfill (ocean and land food web)

Share with your neighbor! What energy role is filled by the first

organism in a food chain?

How can an organism be both a first and second level consumer?

Energy Pyramids

How do organisms obtain energy?When an organism eats, it obtains energy.

Energy Pyramid: a diagram that shows the amount of energy that moves from one feeding level to another in a food webMost energy is available at the producer

levelEach level has less energy available

Energy Pyramids

10% of energy at one level is transferred to the next level

Where does the other 90 percent go? The other 90% is used for the

organism’s life processes or is lost to the environment as heat

The amount of energy limits the number of consumers an ecosystem can support.

How does the Energy Pyramid Shape demonstrate the energy available at each level of a food web?

Exit Slip

1. Why do organisms need energy?

2. Where does this energy come from?

3. What is the difference between a food

web and a food chain?

4. Define: producers, consumers,

decomposers, and energy pyramids.