Mrs.Keadle JH Science
Name__________________________________ period _____
date assigned_____________ date due ______________ date returned _____________
Live Oak County Dining
1. Take the “Land” cards out of the bag. As a table, sort through them and place them
on the poster where you think they belong. Write the name or description on the
pyramid below.
Live Oak County Dining
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Mrs.Keadle JH Science
Directions: As a table, take out the “Land” cards and lay them on your table where you
can see them. Remove the cards without pictures and set them to the side. With your
group, arrange the pictures to show a food web then diagram the web on the paper.
Don’t forget to draw the arrows to show the energy flow through the web (hint: arrow
points to the animal getting the energy).
LAND FOOD WEB
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Mrs.Keadle JH Science
2. Take the “Aquatic” cards out of the bag. As a table, sort through them and place
them on the poster where you think they belong. Write the name or description on
the pyramid below.
Live Oak County Dining
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Mrs.Keadle JH Science
Directions: As a table, take out the “aquatic” cards and lay them on your table where
you can see them. Remove the cards without pictures and set them to the side. With
your group, arrange the pictures to show a food web then diagram the web on the
paper. Don’t forget to draw the arrows to show the energy flow through the web (hint:
arrow points to the animal getting the energy).
AQUATIC FOOD WEB
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Mrs.Keadle JH Science
Directions: Answer the following questions. The Energy Flow Power Point will
help you.
3. Describe how energy enters an ecosystem? _______________________________
___________________________________________________________________
4. What is a producer? ___________________________________________________
___________________________________________________________________
___________________________________________________________________
5. What is another name for a producer? ____________________________________
6. What is a consumer? __________________________________________________
___________________________________________________________________
___________________________________________________________________
7. What is another name for a consumer?____________________________________
8. What do first level (primary) consumers eat? ______________________________
9. What do second level (secondary) consumers eat? _________________________
__________________________________________________________________
__________________________________________________________________
10. Are there very many third level (tertiary) consumers? ______ Why? ____________
__________________________________________________________________
__________________________________________________________________
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Mrs.Keadle JH Science
Study the diagram below of a partial desert food web. Then answer the
following question(s).
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Who are the producers?
A
wood rat and night snake
B
Joshua tree
C
screech owl and hawk
D
termite and boring weevil
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What do the arrows in the
diagram represent?
F
the flow of energy in a food
web
G
evolution from less to more
complex organisms
H
symbiotic relationships
among desert organisms
J
the movement of desert
organisms at night
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Mrs.Keadle JH Science
Use the desert food web below to answer the following questions:
13
Who are the producers?
A
cacti and sagebrush
B
hawks and coyotes
C
ants and tarantulas
D rats and snakes
14
How is this ecosystem MOST likely to be affected by a large increase in the
number of rats?
F
The snake population will decrease.
G
There will be an increase in the number of snakes, coyotes and
hawks.
H
There will be a decrease in the number of coyotes and hawks.
J
There will be an increase in the number of cacti and sagebrush
plants.
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Mrs.Keadle JH Science
15
What happens to the solar
energy absorbed by plants
during photosynthesis?
17
16 Energy flows through living
systems from F
The sun, to heterotrophs,
and then to autotrophs.
G
Autotrophs, to the
environment, and then to
heterotrophs.
It is stored as heat within the
plant for cellular functions.
H
The sun, to autotrophs, and
then to heterotrophs.
It is converted into
mechanical energy.
J
The environment, to the
heterotrophs, and then to
autotrophs.
A
It is recycled by plants and
returned to the atmosphere.
B
It is converted into oxygen
and glucose.
C
D
Which of these is the BEST way
to recognize a decomposer in an
ecosystem?
18 Phytoplankton consists of singlecelled algae. They live in aquatic
ecosystems and can use
photosynthesis. Which is the role
of phytoplankton in an
ecosystem?
A
It does not move and is
mostly green.
B
It chases other organisms.
F
consumer
C
It lives on or near dead
organisms.
G
decomposer
H
parasite
J
producer
D It feeds only on animals.
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Mrs.Keadle JH Science
19 If you eat a ham and cheese
sandwich with lettuce and
tomatoes, where would you be
placed on a food chain?
20 grass -- cricket--- bird
The source of energy for this
food chain is -
A
producer
F
sunlight
B
primary consumer
G
soil
C
secondary consumer
H
water
D
tertiary consumer
J
seeds
21
The diagram illustrates the relationship of two species living in a grassland
biome. What conclusion can be drawn about the location of the two species
in a food web.
A
Species A and B occupy the same level of the food web.
B
Species A is located on a higher level of the food web.
C
Species B is located on a higher level of the food web.
D
Species A and B shouldn’t be in the same food web.
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Mrs.Keadle JH Science
Extension:
Read the following information then answer the questions.
When a plant or animal dies, it leaves behind nutrients and energy in the organic
material that made up its body. Scavengers can feed on the carcass, but they leave
behind a large amount of unused energy and nutrients.
This unused energy is found in the form of uneaten bones, feathers, exoskeletons, fur,
wood and feces. Decomposers complete the process by changing this remaining
organic matter into carbon dioxide and nutrients. Some of the nutrients include nitrogen,
phosphorous and magnesium. Plants and algae can use these nutrients which recycles
them back into the ecosystem.
22. What are decomposers?
23. What are three examples of decomposers?
24. Where do you think they should be added to a food web or chain?
25. What would happen in the ecosystem if there were no decomposers?
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