Sci 8 6.2 Food Webs

Energy Flow in Ecosystems

Multiple Choice

What is a producer?

• Organism that makes its own energy

• Organism that breaks down dead organisms

• Organism that eats other organisms for food & energy

Multiple Choice

What is an omnivore?

• An organism that only eats plants for energy

• An organism that eats animals for energy

• An organism that eats both plants and animals for energy.

Multiple Choice

What is a carnivore?

• An organism that only eats plants for energy

• An organism that eats animals for energy

• An organism that eats both plants and animals for energy.

Multiple Choice

What is an herbivore?

• An organism that only eats plants for energy

• An organism that eats animals for energy

• An organism that eats both plants and animals for energy.

Multiple Choice

What is a consumer?

• Organism that makes its own energy

• Organism that breaks down dead organisms

• Organism that eats other organisms for food & energy

Multiple Choice

All energy on Earth ultimately comes from what source?

• Water

• Sun

• Consumers

• Oxygen

Multiple Select

Click on the image to make it larger-- Choose all that apply: The hawk gets energy from...

• mouse

• rabbit

• wildflowers

• snake

Multiple Select

Click on the image to make it larger-- Choose the living things that are producers...

• wildflowers

• rabbit

• snake

• grass

Multiple Select

Click on the imgae to make it larger-- Choose the herbivores in the food web....

• hawk

• mouse

• rabbit

• snake

Multiple Choice

Why might an organism have more than one arrow coming from them in a food web?

• More than one organism may eat them.

• They may eat more than one other organism.

• This organism gets its energy from multiple sources.

Multiple Choice

In the food web shown, who is the secondary consumer?

• grass

• mouse

• rabbit

• fox

Multiple Choice

The rabbit in this food web would be considered a:

• Decomposer

• Producer

• Secondary (2nd) Consumer

• Primary (1st) Consumer

Producers

These “produce” energy
for themselves and in turn
for everything else

● Flowers
● Cactus
● Trees
● Grasses
● Phytoplankton

Consumers

● Need to “consume”

food to get glucose.

● Organisms that rely on

other organisms for
their energy and food
supply
○ Animals
○ Cows
○ Deer
○ Lions
○ Insects

Consumers

Consumer

Description

Examples

Herbivore

eats only plants
cows, caterpillars,

deer

Carnivore

eat only animals

snakes, owls, sharks

Omnivore
eat both plant and

animals

humans, bears,

crows

Detritivore
eat plant and animal

remains
worms, crabs, mites

Primary Consumers

● Eat producers
● Herbivores

○ Examples: Caterpillars, Wildebeest, Rabbits, Squirrels

Secondary Consumers

● Eat primary consumers
● Carnivores

○ Examples: Spiders, Snakes,

Seals, Pufferfish, Rats

Tertiary Consumers

● Eat secondary consumers
● Carnivores

○ Examples: Tuna, Dolphins,

Turtles, Whales, Lions,
Tigers

Decomposers

● Get energy from dead things

○ Examples:

■ Earthworms
■ Bacteria
■ Fungi

Food Chains

● Shows the eating patterns in an ecosystem
● Food energy flows from one organism to

another

● The arrow points from the organisms being

eaten to the organism that eats it.

Energy starts here

Energy ends up here

Food Chains

Plant → grasshopper → bird → snake → owl

● A food chain

cannot
continue to go
on and on
forever

Food Webs

● Show the feeding relationships between many

organisms in an ecosystem
○ Links all food chains in an ecosystem together