Page 80 - Science Course 3 (Book 1)

Mo2-L5b: What are Food Chains and Food Webs?

Obtaining Energy A food chain always begins with a producer because
producers are the source of energy for the rest of the
Ecosystems include several different kinds of organisms in a community
consumers.
In a food chain, energy moves from a producer to
Herbivores, such as snails, rabbits, deer, and bees, consumers such as herbivores or omnivores, and
eat plants and other producers. then on to other omnivores, carnivores, or
decomposers.
Carnivores, such as cats, snakes, hawks, frogs and
spiders, eat herbivores and other consumers.

Omnivores, including bears, robins, pigs, rats, and
humans, eat producers and consumers.

Decomposers, including fungi, bacteria, wood lice,
termites, and earthworms, break down the bodies of
dead organisms into compounds that can be used by
living organisms.
CO 2 Solar Energy

O 2

O 2

CO 2 Most ecosystems contain many food chains.

Shows exchange of nutrients & organic A food web is a more complex model of energy
molecules transfer that can show how the food chains in a
community are interconnected

Transferring Energy

The transfer of energy takes place in an ecosystem
when one organism eats another.

A model that shows how energy flows in an
ecosystem through feeding relationships is called
a food chain.

72