Transcript A Food Chain is drawn using arrows to indicate the direction in

What is the
source of energy
in this ecosystem?
What path does
energy take to
get to the hawk?
A Food Chain is a simple
model that scientists
use to show how matter
and energy move
through an
ecosystem.
?
A Food Chain is drawn using arrows to
indicate the direction in which energy
is transferred from one organism to
the next.
Locate the three envelopes
containing the food chain cards
and the envelope with the
matter and energy flow arrows.
Take out four arrows, then remove the food chain
cards from the envelope labeled Set 1. Use all of
the cards and the four arrows to make a food
chain.
Remove the second set of food chain cards and
make a second food chain, again using four matter
and energy arrows. Do the same with the third set
of food chain cards. There should be three
separate food chains on the table.
Record your
food chains in
your notebook
Examine each of the food chains
above. Which food chain is most
sustainable? Support your answer
with information from the food chains
and record it in your notebook
Choose at least 10 of the food chain cards and
arrange them to form a food web. Place the matter
and energy flow arrows in the appropriate places
within the food web.
Draw the food
web you
created in
your notebook.
A food chain represents only one
possible route for the transfer of
matter and energy through an
ecosystem.
Many other routs may exist.
A Food Web is made up
of many interconnected
food chains and shows
all the possible feeding
relationships within a
community,
Choose at least 10 of the food chain cards and
arrange them to form a food web. Place the matter
and energy flow arrows in the appropriate places
within the food web.
Draw the food
web you
created in
your notebook.
Use the diagram
on the right to
answer the
following
questions:
Who is the producer in this food web?
Algae
How many
different
food
chains 6
involve
Squid?
What are they?
algae  small animals  squid
 elephant seal  killer whale
algae  squid  killer whale
algae  squid  leopard
seal  killer whale
algae  small animals  squid 
elephant seal  leopard seal 
killer whale
algae  small animals  squid  killer whale
algae  small animals  squid  leopard seal  killer whale
Each organism in a food chain
represents a feeding step, or
Tropic Level, in the passage of
energy and materials
Use the sheet at
your table to
illustrate an example
of an ecological
pyramid by placing
each food chain card
at the appropriate
trophic level on the
Ecological Pyramid.
Copy the
ecological
pyramid of
energy you
created into
your biology
notebook.
Create a table like the one
above in your biology
notebook. Using your
filled-in pyramid, write
the name of the organism
on each food chain card in
the appropriate column in
the table.
Ecologists often
illustrate the flow
of energy through
ecosystems with an
energy pyramid.
Only
about 10% of the
energy at any tropic
level is transferred
to the next tropic
level.
Much of the energy
obtained from food
(90%) is used for
metabolism or lost to
the environment in the
form of heat.
In the diagram above, which organisms
are considered primary consumers
In the diagram above, which organisms
are considered secondary consumers
Which organisms are considered both
secondary and tertiary consumers?
Using what we
know about
energy, how much
energy would be
available to the
leopard seal using
this food chain if
algae begins with
250,000 units?
25
250
2,500
25,000
250,000
250
What about the killer whale? 25
Explain the 10% rule
of an ecosystem
using the information
from the ecological
pyramid and the
glossary.
Which example, a
food chain or a food
web, represents a
more realistic picture
of the flow of matter
and energy in an
ecosystem? Support
your answer.