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WorksheetsFood Webs
Total questions: 38
Worksheet time: 3hrs 29mins
Name
Class
Date
1.
What will likely happen to the foxes and the wolves if the rabbits are removed
a)
The foxes will eat more wolves.
b)
The foxes will eat fewer wolves.
c)
There will be more foxes and wolves.
d)
There will be fewer foxes and wolves
2.
Which model correctly shows energy flow in a food chain?
a)
plants → insects → salmon → bears
b)
insects → plants → bears → salmon
c)
bears → salmon → insects → plants
d)
salmon → bears → plants → insects
3.
Sea otters move into the ocean bay. They eat all the sea urchins. This change will cause the
a)
kelp to have less food
b)
crabs to have more food
c)
sea ducks to have less food
d)
arctic foxes to have more food
4.
Which organism below belongs in level 3 of this marine food web?
a)
salmon
b)
zooplankton
c)
sea alga
d)
polar bear
5.
Which chart correctly shows three of the organisms according to their roles in cycling matter in the marine food web?
a)
Primary consumer - bacteria
Secondary consumer - fish
Decomposer - seal
Secondary consumer - fish
Decomposer - seal
b)
Primary consumer - fish
Secondary consumer - seal
Decomposer - polar bear
Secondary consumer - seal
Decomposer - polar bear
c)
Primary consumer - krill
Secondary consumer - fish
Decomposer - bacteria
Secondary consumer - fish
Decomposer - bacteria
d)
Primary consumer - ice algae
Secondary consumer - krill
Decomposer - fish
Secondary consumer - krill
Decomposer - fish
6.
Which of the following would most likely occur to the populations within the community of organisms immediately after a wildfire burns the environment?
a)
Hawks would increase and foxes would increase.
b)
Hawks would decrease and foxes would increase.
c)
Meadow plants would increase and rabbits would decrease.
d)
Meadow plants would decrease and rabbits would decrease.
7.
Which statement best describes what will happen if the population of herbivores in the community decreases?
a)
The population of foxes will increase.
b)
The population of hawks will increase.
c)
The population of rabbits will increase.
d)
The population of meadow plants will increase.
8.
Which statement best describes the flow of energy as it passes through the organisms in the pyramid?
a)
Energy flows through the organisms from bottom to top and increases at each level.
b)
Energy flows through the organisms from bottom to top and decreases at each level.
c)
Energy flows through the organisms from top to bottom and increases at each level.
d)
Energy flows through the organisms from top to bottom and decreases and at each level.
9.
Which animal is classified as an omnivore?
a)
red fox
b)
deer
c)
black bear
d)
rabbit
10.
Which of the following animals might compete with the coyote in this food chain?
a)
deer
b)
rabbit
c)
owl
d)
hummingbird
11.
Decomposers are important in the food chain because they
a)
produce their own food using light from the Sun.
b)
stop the flow of evergy from one organism to another.
c)
break down dead organisms and recycle nutrients into the soil.
d)
are microscopic and other organisms cannot consume them.
12.
The zooplankton in this food chain are
a)
primary producers.
b)
primary consumers.
c)
secondary consumers.
d)
tertiary consumers.
13.
Which energy pyramid best represents the data in the table?
a)
1st trophic level - seeds, nuts, roots, grass, leaves, and flowers
2nd trophic level - rodents
3rd trophic level - snakes
4th trophic level - hawks and owls
2nd trophic level - rodents
3rd trophic level - snakes
4th trophic level - hawks and owls
b)
1st trophic level - rodents
2nd trophic level - seeds, nuts, roots, grass, leaves, and flowers
3rd trophic level - snakes
4th trophic level - hawks and owls
2nd trophic level - seeds, nuts, roots, grass, leaves, and flowers
3rd trophic level - snakes
4th trophic level - hawks and owls
c)
1st trophic level - hawks and owls
2nd trophic level - seeds, nuts, roots, grass, leaves, and flowers
3rd trophic level - rodents
4th trophic level - snakes
2nd trophic level - seeds, nuts, roots, grass, leaves, and flowers
3rd trophic level - rodents
4th trophic level - snakes
d)
1st trophic level - hawks and owls
2nd trophic level - rodents
3rd trophic level - snakes
4th trophic level - seeds, nuts, roots, grass, leaves, and flowers
2nd trophic level - rodents
3rd trophic level - snakes
4th trophic level - seeds, nuts, roots, grass, leaves, and flowers
14.
If additional wrens are introduced into this ecosystem, there will most likely be an immediate decrease in the
a)
frog population
b)
snake population
c)
falcon population
d)
grasshopper population
15.
a)
The Spirogyra population will probably die.
b)
The bluegill population will probably increase.
c)
The Daphnia population will eat something else.
d)
The smallmouth bass population will die.
16.
For the food chain shown, which of the following changes would have the most severe consequences?
a)
a drastic decrease in rainfall, causing drought
b)
the poaching of predatory hawks by game hunters
c)
the introduction of a second predator that eats field mice
d)
a parasitic infestation that reduces the cricket population
17.
Which of these organisms would most likely be found at the top of an energy pyramid?
a)
clams
b)
sardines
c)
sharks
d)
kelp
18.
Which of these organisms would most likely be found at the bottom of a biomass pyramid?
a)
giant squids
b)
sand sharks
c)
sea cucumbers
d)
green algae
19.
Which group would most likely contain living algae?
a)
producers
b)
first order consumers
c)
second order consumers
d)
decomposers
20.
According to the diagram, nutrients from dead organisms are released into the soil by the action of ___.
a)
producers
b)
first order consumers
c)
third order consumers
d)
decomposers
21.
a)
caterpiller → honey bee → woodpecker
b)
oak tree → squirrel → woodpecker
c)
oak tree → caterpiller → woodpecker
d)
beetle → woodpecker → squirrel
22.
What is the source of energy for the algae?
a)
waves
b)
sunlight
c)
bacteria
d)
rotifers, water fleas and tadpoles
23.
Suppose that a new predator of the rabbit migrated to this ecosystem. What is the most likely initial effect on the other organisms?
a)
more competition among the mice for food
b)
more competition among the hawks for food
c)
less competition among snakes for food
d)
less grass available for food
24.
A chemical pesticide was applied to an area of this ecosystem by a landowner to control the mouse population. There was a decrease in the mouse population due to the presence of this pesticide. Which one of the following would most likely occur first due to this change in the ecosystem?
a)
the amount of grass would decrease
b)
the snake population would increase
c)
the rabbit food supply would increase
d)
the snake food supply would increase
25.
The available chemical energy in this ecosystem ____.
a)
decreases as it flows from consumer to producer
b)
remains constant as it flows from consumer to producer
c)
decreases as it flows from producer to consumer
d)
increases as it flows from producer to consumer
26.
Which one of the following is true of grass in an ecosystem?
a)
it converts oxygen to glucose
b)
it produces carbon dioxide from oxygen and water
c)
it produces glucose from carbon dioxide and water
d)
it converts water to energy
27.
If animals eat plants to get energy, where do plants get their energy?
a)
soil
b)
water
c)
wind
d)
sun
28.
a)
chemical energy to chemical energy
b)
light energy to chemical energy
c)
chemical energy to heat energy
d)
heat energy to mechanical energy
29.
a)
sun
b)
frog
c)
grass
d)
grasshopper
30.
a)
the number of bass will increase
b)
the number of crayfish will decrease
c)
the crayfish will get their energy directly from the sun
d)
the number of bass and ospreys will increase
31.
Which conclusion would be appropriate, based on the new information?
a)
another organism in the marine ecosystem is a producer
b)
organism W is a secondary consumer in the marine ecosystem
c)
the role of organism T in the marine ecosystem changes during its life
d)
this marine ecosystem does note have any producers
32.
a)
there would be more rabbits
b)
there would be fewer rabbits
c)
more grass would grow
d)
less grass would be eaten
33.
The sun's energy is most directly available to people through
a)
path A
b)
path B
path B
path B
c)
path C
d)
path D
34.
We get energy from the food we eat. The energy in the food first comes from the
a)
soil
b)
fertilizers used by farmers
c)
sun
d)
vitamins added by food manufacturers
35.
a)
bird
b)
fox
c)
caterpillar
d)
tree
36.
a)
decomposers
b)
prey
c)
consumers
d)
producers
37.
What do the arrows in the food chain indicate about the flow of energy in an ecosystem?
a)
energy is continuously recycled by the organisms in an ecosystem
b)
energy flows in one direction in an ecosystem, from producers to consumers
c)
more of the available energy in an ecosystem is given to large animals than to small animals
d)
organisms at the end of the food chain receive more energy than those at the beginning
38.
Which group is not represented in the food web?
a)
producers
b)
primary consumers
c)
secondary consumers
d)
decomposers
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