Download Energy Flow

The World Wide Web
Food Chains & Food Webs
ENGAGE
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What is the major difference between
a chain and a web?
EXPLORE
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Classroom Food Chain
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Hawk??
Berries??
Frogs??
Insects??
Sun??
Snakes??
What is the ultimate source of energy
for everything on Earth?
– Sun major supplier of the earth’s energy.
Food Chain
The simplest
feeding
arrangement in an
ecosystem.
Where do the arrows
point?
Food Webs
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Many food chains
interacting with
each other.
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Shows the
movement of
energy and matter
in an ecosystem.
Click the following
button to complete an
activity which
demonstrates how a
food web works.
EXPLORE:
Interactions in Ecosystems

Tabizi Python & Clendro Hawks
– Using Imaginary Animals to Achieve Real
Knowledge About Ecosystems
– Science Scope January 2007
Categorize Your Cards

Producers
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Herbivores
Carnivores
Begin Creating Food
Chains
Neumelinda Tree
Red Tarmal
Tabizi Python
Rahpsheraga
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Start each food
chain with a
producer
Explain
The Flow of Energy
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What is a producer?
What is a consumer?
Name three different types of
consumers.
How does energy flow in a food web?
What is the earth’s major energy
supplier?
Energy CANNOT be RECYCLED, it flows
through the ecosystem.
Most of the energy released is lost in the
form of heat.
Biomass
Ecological Pyramid
Ecological Pyramid
Ecological Pyramid
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Which
Which
Which
Which
level
level
level
level
has
has
has
has
the
the
the
the
most energy?
most organisms?
least organisms?
least energy?
Ecological Pyramids
Energy Pyramid
Shows the relative amount of
energy available at each trophic
level. Organisms use about 10
percent of this energy for life processes.
The rest is lost as heat.
Biomass Pyramid
Represents the amount of
living organic matter at each
trophic level. Typically, the
greatest biomass is at the
base of the pyramid.
Pyramid of
Numbers
Shows the relative
number of individual
organisms at each
trophic level.
Pyramid of Numbers
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
Carnivore
populations are
smaller in
comparison to the
rest of the
ecosystem.
They require more
food to sustain their
lives than the lower
organisms.
Energy Pyramid
(Trophic Levels)
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The lowest trophic level
of the pyramid
represents the
producers and contains
the most energy.
The second level
represents the primary
consumers. A 90%
decrease in useable
energy
The third level or
secondary consumers
will have 10% of the
energy from the level
below to use.
Let’s Practice
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How many trophic
levels are present?
5
Determine the amount
of useable energy for
the different trophic
levels.
Level 2: 35 J
Level 3: 3.5 J
Level 4: 0.35 J
Level 5: 0.035 J
ELABORATE

Tabizi Python & Clendro Hawks
– Using Imaginary Animals to Achieve Real
Knowledge About Ecosystems
– Science Scope January 2007

Event Cards---What happens to the
food web when….
EVALUATE

The Lorax
– List as many interactions as you can
while watching or listening to the story.
– Create a food web
– Draw a biomass pyramid to show the
relative amount of living organic matter at
each trophic level.