AIM: How do plants & animals depend on each
other and their physical environment?
4/25/13
DO NOW:
1. Put last night’s Review
Sheet in the basket.
2. Pick up your scantron
& write your
homework assignment
on it.
HOMEWORK:
1. Read p. 55-57
2. Answer questions #1-36 on
p. 58-65 on the scantron.
DUE – Tomorrow - 8 AM
What is a food chain?
 A model for showing the flow of food energy from one
organism to the next in a community.
Explain what the arrows on the food chain represent?
 Who’s eating what
 The directional flow of energy
Where do producers get
their energy?
 The sun
Where do consumers get
their energy?
 Eat other organisms
What is the primary
source of energy on
Earth?
 The Sun
Why?
How are primary, secondary, and tertiary consumers different?
 Primary consumers – eat on plants
 Secondary consumers – eat primary consumers
 Tertiary consumers – eat secondary consumers
Identify the Primary, Secondary, & Tertiary consumers in the food
chain.
What is the function of the
decomposers?
 Break down the waste
and remains of dead
organisms
ILS Question
1. What does the leopard seal eat?
2. What do the arrows in the diagram represent?
3. Identify the herbivore in the diagram.
ILS Question
Base your answers to questions 1 through 3 on the diagram
below and on your knowledge of science. The diagram
represents an ecosystem.
1. Identify one producer shown in the diagram.
2. Identify one consumer in the diagram.
3. What is the original source of energy for this ecosystem?
What does an Energy pyramid
show?
 Energy lost through a food
chain
Which organisms have the
greatest energy in a energy
pyramid?
 The producers (bottom)
Describe the amount of energy
that is passed along a food
chain based on the energy
pyramid.
 Energy is lost as you move
along the food chain.
 90% energy lost?
What is a food web?
 Many food chains linked
together in an ecosystem
What is a predator?
 An animal that hunts,
kills, & eats other animals
What is a prey?
 Animals that are killed
and eaten
Give an example of a
predator-prey relationship.
ILS Question
Base your answers to questions 1 and 2 on the diagram below.
which shows a partial food web.
1. How many organisms in this food web feed on the mice?
2. Which group of organisms is missing from this food web?
ILS Question
Base your answers to
questions 1 and 2 on the
food web below and on
your knowledge of science.
1. Which organism
labeled in this food web
provides energy, either
directly or indirectly, to
all of the other
organisms?
2. Explain why the
amount of food
available to the slug
population might
increase if the aphid
population decreased.
ILS Question
Base your answers to
questions 1 through 3 on the
food web below and on your
knowledge of science
1. Identify two consumers in
this food web that eat
producers.
2. Explain why the foxes
shown in this food web are
categorized as carnivores.
3. Both owls and hawks eat
mice. Explain why the
removal of mice from this
food web would likely affect
owls more than hawks.