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Unit 8 Review

Total questions: 92

Worksheet time: 46mins

Name
Class
Date
1.
Which best determines the number of wolves that can live in an area?
a)
the amount of snow in the area each year
b)
the number of birds that live in the area
c)
the number of trees in the area
d)
the amount of food available in the area
2.
If wolves prey on deer for food, what will most likely happen to the deer population if wolves are removed from an area where deer live?
a)
The population of deer will increase.
b)
The population of deer will decrease.
c)
The population of deer will remain the same.
d)
The population of deer will become extinct.
3.
The white-tailed deer found in North Carolina are herbivores. What will most likely happen to the deer if there is a drought and most of the plant life dies?
a)
Deer population will not change.
b)
Deer population will increase due to a lack of food.
c)
Deer population will decrease due to a lack of food.
4.
In an ecosystem dependent on pine trees, if a pine forest is cleared for a new housing development, which will most likely occur?
a)
Some of the organisms would be able to survive the change because of erosion.
b)
The organisms in the ecosystem would have to adapt to living in fenced area.
c)
Many of the organisms would perish due to habitat loss.
5.

Which would a drought (not raining for long period) most likely affect?

a)

all organisms in a particular ecosystem

b)

only the plants in a particular ecosytem

c)

only the animals in a particular ecosystem

6.

What term describes a species role in an ecosystem?

a)

niche

b)

habitat

c)

environment

7.
Which are major abiotic factors that determine the types of plants that can grow in an ecosystem?
a)
birds and bees
b)
precipitation and bees
c)
precipitation and temperature
8.
Which is the place where a member of a population lives and finds food?
a)
space
b)
habitat
c)
shelter
d)
population
9.
Which is the most significant limiting factor in a desert ecosystem?
a)
nutrients
b)
predators
c)
sunlight
d)
water
10.
Which of these is an abiotic element of a desert ecosystem?
a)
sand
b)
cactus
c)
lizard
d)
scorpion
11.
Which best describes mutualism?
a)
Ticks live and feed on dogs and other animals’ blood to survive.
b)
Mushrooms send out long, underground structures which allow them to grow in other areas.
c)
Ants attack animals that try to feed on the acacia tree, and the ants feed on the nectar of the tree.
12.
Kudzu vines grow by climbing and wrapping around trees. Trees covered by kudzu can die because they are starved of sunlight. What type of relationship exists between the trees and the kudzu growing on them?
a)
competition
b)
mutualism
c)
parasitism
d)
predator-prey
13.

Which of these organisms is a producer in a aquatic ecosystem?

a)

fish

b)

gull

c)

algae

d)

worm

14.
Which term best describes two predators living in the same habitat who feed on the same prey?
a)
coexistence
b)
competition
c)
mutualism
15.
Dead matter and waste would pile up without which type of organism?
a)
decomposer
b)
consumer
c)
producer
16.
Which is the best term to describe organisms living together in their ecosystem?
a)
parasitism
b)
competition
c)
coexistence
17.
As a dog walks through thick brush, a tick attaches to its leg. Which best describes the relationship between the dog and the tick?
a)
parasitism
b)
mutualism
c)
commensalism
18.
Which best explains cooperation?
a)
a colony of ants working together to build an ant colony
b)
a butterfly getting nectar from a flower
c)
male deer fighting for territory
19.
Bees and butterflies help pollinate plants, enabling them to reproduce while getting nectar from those plants. Which is best represented by this relationship?
a)
mutualism
b)
parasitism
c)
competition
d)
predator-prey
20.
Which is the base of a rain forest ecosystem food web?
a)
decomposition
b)
precipitation
c)
consumers
d)
producers
21.
Which statement about parasitism is most correct?
a)
Both organisms benefit.
b)
Neither organism benefits.
c)
One organism benefits and the other is not affected.
d)
One organism benefits and the other is negatively affected.
22.
Which is the best example of predation in an ecosystem?
a)
bee and flower
b)
fox and rabbit
c)
flea and rat
d)
mosquito and human
23.
Which best demonstrates a producer in an ecosystem?
a)
fox
b)
bear
c)
grass
d)
rabbit
24.
Which relationship shows how terrestrial and aquatic food webs are interconnected?
a)
A bird eats fish.
b)
A cow eats grass.
c)
A shark eats fish.
d)
A grasshopper eats grass.
25.
Which shows the correct flow of energy through this simple food chain?
a)
fox → grass → rabbit
b)
grass → fox → rabbit
c)
grass → rabbit → fox
d)
rabbit → grass → fox
26.
Which level of a food chain has the most energy?
a)
decomposers
b)
scavengers
c)
consumers
d)
producers
27.
Through which process do organisms release carbon dioxide into the atmosphere?
a)
diffusion
b)
respiration
c)
transpiration
d)
photosynthesis
28.
What is the primary source of energy for producers?
a)
the Sun
b)
the atmosphere
c)
the metabolism of glucose
d)
the decomposition of organic matter
29.
Through which process do producers convert sunlight into food energy which is consumed and passed on to other organisms?
a)
oxidation
b)
reduction
c)
photosynthesis
d)
cellular respiration
30.
An energy pyramid is pictured.

Which statement best explains the flow of energy as it moves through the different levels?
a)
Energy decreases as it is lost as heat to the environment.
b)
Energy increases as it is gained from the environment.
c)
Energy is unavailable because it is used up by the organisms at Level 1.
d)
Energy is transferred as it is produced by organisms in the next level.
31.
Which process will directly result in organic matter being added to the soil?
a)
water freezing in cracks of rocks
b)
glaciers carving out a valley
c)
river water eroding the banks of a stream
d)
bacteria breaking down dead matter
32.
In an energy pyramid, the total energy available for consumption from one trophic level to the next one above it is
a)
reduced
b)
conserved
c)
multiplied
d)
evenly distributed.
33.
Biotic nitrogen fixation is performed by certain
a)
lichens
b)
viruses
c)
bacteria
d)
mammals
34.
By which process is water taken from the ocean to form clouds?
a)
condensation
b)
evaporation
c)
transpiration
35.
Which best describes the role of nitrogen-fixing bacteria in the flow of energy?
a)
They convert carbon dioxide into nitrogen.
b)
They convert nitrogen into carbon dioxide.
c)
They convert sunlight and nitrogen into energy-rich sugar molecules.
d)
They convert atmospheric nitrogen into molecules that other organisms can use.
36.
Abiotic factors in the environment are all __________. 
a)
living
b)
nonliving
37.
A group of populations that interact in an area is __________
a)
ecosystem
b)
community
c)
biome
d)
population
38.
Lions, birds, snakes and trees are all __________.
a)
abiotic factors
b)
biotic factors
c)
part of a niche
d)
in the same food chain
39.
Grass --> Grasshopper --> Mockingbird represents __________. 
a)
food chain
b)
food pyramid
c)
food web
d)
ecosystem
40.
Energy in an ecosystem is used for growth or lost as __________
a)
light
b)
heat
c)
death
d)
biomass
41.
Algae, grasses and trees are all __________. 
a)
decomposers
b)
consumers
c)
autotrophs/producers
d)
pyramids
42.
The portion of Earth that supports life is the __________
a)
individual
b)
community
c)
biosphere
d)
environment
43.
An animal that eats plants and meat is a(n) __________.
a)
herbivore
b)
omnivore
c)
carnivore
d)
decomposer
44.
An organism`s role in its community is its __________, and where it lives is its _________.
a)
habitat; niche
b)
role in community; niche
c)
niche; role in the community
d)
niche; habitat
45.
Which heterotroph in the food chain receives the largest amount of useful energy?
a)
bird
b)
fox
c)
snake
d)
tree
46.
Which of the following types of organisms occupies the trophic level of greatest biomass?
a)
herbivores
b)
plants
c)
primary consumers
d)
secondary consumers
47.
What is the source of energy that flows through most of the food chains on Earth?
a)
plants
b)
the sun
c)
temperature
d)
wind
48.
The ecosystem is comprised of both ____ and _____factors.
a)
rain and shine
b)
biotic and abiotic
c)
earth and environment
49.

Which population would be most affected if there is a decrease in the population of aquatic insects?

a)

elk

b)

frog

c)

moose

d)

squirrel

50.

Which best describes how coral reefs, forests, and ponds sustain animal populations?

a)

They provide resources animals need to survive.

b)

They are found in areas where humans have little impact.

c)

They provide a source of water from which animals can drink.

d)

They are found in areas where temperatures are too high for plants to grow.

51.

Which is the most significant limiting factor in a desert ecosystem?

a)

nutrients

b)

predators

c)

sunlight

d)

water

52.

As an insect population decreases, which would most likely also decrease?

a)

hawk population

b)

vulture population

c)

sparrow population

d)

hummingbird population

53.

An aquarist takes half of the fish out of a tank, and the remaining fish grow larger and are healthier. Which factor was most likely affecting the fish?

a)

water

b)

space

c)

shelter

d)

food

54.

Which is the place where a member of a population lives and finds food?

a)

space

b)

habitat

c)

shelter

d)

population

55.

Which are major abiotic factors that determine the types of plants that can grow in an ecosystem?

a)

birds and bees

b)

precipitation and bees

c)

precipitation and temperature

56.

What term describes how a species meets its need for food and shelter and how it reproduces?

a)

niche

b)

habitat

c)

environment

57.

Which is an abiotic factor that MOST limits the number of frogs living in a pond?

a)

the color of the water

b)

the number of predators

c)

the temperature of the water

d)

the populations of the producers

58.

An aquatic food web is shown above. If acid rain causes a decrease in the number of mayfly nymphs, which population will decrease the MOST in number?

a)

trout

b)

frogs

c)

birds

d)

snails

59.

If wolves prey on deer for food, what will most likely happen to the deer population if wolves are removed from an area where deer live?

a)

The population of deer will increase.

b)

The population of deer will decrease.

c)

The population of deer will remain the same.

d)

The population of deer will become extinct.

60.

In a food pyramid, which best explains why the number of organisms decreases from one trophic level to the next?

a)

Consumers at the lower level require more energy than the top-level consumers.

b)

Consumers at the top level require more energy than the lower-level consumers.

c)

The consumers are feeding on larger organisms that have less energy.

d)

The consumers are feeding on smaller organisms that have less energy.

61.

Which best explains the role of plants in the carbon cycle?

a)

Plants take in carbon dioxide released by other organisms.

b)

Plants take in oxygen and release carbon dioxide.

c)

Plants take in carbon dioxide and pass it directly to animals.

62.

After decomposers break down decaying organisms, which directly uses the resulting nutrients?

a)

animals

b)

fossils

c)

plants

d)

the Sun

63.

What is the role of photosynthesis in the carbon cycle?

a)

It adds carbon dioxide to water.

b)

It removes carbon dioxide from plants.

c)

It adds carbon dioxide to the atmosphere.

d)

It removes carbon dioxide from the atmosphere.

64.

Which best describes the role humans play in the oxygen cycle?

a)

They combine oxygen with other elements.

b)

They breathe in oxygen and carbon dioxide from the atmosphere.

c)

They breathe in oxygen and convert it to carbon dioxide, which they breathe out into the atmosphere.

d)

They breathe in carbon dioxide and convert it into oxygen, which they breathe out into the atmosphere.

65.

Which level of a food chain has the most energy?

a)

producers

b)

decomposers

c)

scavengers

d)

consumers

66.

Through which process do organisms release carbon dioxide into the atmosphere?

a)

diffusion

b)

transpiration

c)

respiration

d)

photosynthesis

67.

Which best describes the role of nitrogen-fixing bacteria in the flow of energy?

a)

They convert carbon dioxide into nitrogen.

b)

They convert nitrogen into carbon dioxide.

c)

They convert sunlight and nitrogen into energy-rich sugar molecules.

d)

They convert atmospheric nitrogen into molecules that other organisms can use.

68.

An energy pyramid is illustrated above. Which statement BEST explains the flow of energy as it moves through the different levels?

a)

Energy decreases as it is lost as heat to the environment.

b)

Energy increases as it is gained from the environment.

c)

Energy is unavailable because it is used up by the organisms at Level 1.

d)

Energy is transferred as it is produced by organisms in the next level.

69.

The diagram shows ecological relationships in an African savanna environment. What happens to the amount of energy available to organisms when moving from trophic level 1 to trophic level 2?

a)

The energy decreases by approximately 90%.

b)

The energy increases by approximately 90%.

c)

The energy decreases by approximately 10%.

d)

The energy increases by approximately 10%.

70.
What happens to a population and to competition when there is a reduction of living space?
a)
The population expands and competition intensifies 
b)
Competition strengthens while the population contracts.
c)
The population increases as competition decreases 
d)
Competition weakens and the population decreases 
71.
Which BEST determines the number of wolves that can live in an area? 
a)
the amount of snow in the area each year
b)
the number of birds that live in the area
c)
the number of trees in the area
d)
the amount of food available in the area
72.
Kudzu vines grow by climbing and wrapping around trees. Trees covered by kudzu can die because they are starved of sunlight. What type of relationship exists between the tree and the kudzu growing on them?
a)
competition
b)
mutualism
c)
parasitism
d)
predator-prey
73.
Which BEST explains the importance of nitrogen in the cycling of energy and matter?
a)
Nitrogen increases protein production in plants.
b)
Nitrogen decreases protein production in plants.
c)
Nitrogen decreases the effectiveness of photosynthesis.
d)
Nitrogen increases the effectiveness of photosynthesis.
74.
The white-tailed deer found in North Carolina are herbivores. What will most likely happen to the deer if there is a drought and most of the plant life dies?
a)
Deer population will not change.
b)
Deer population will increase due to a lack of food.
c)
Deer population will decrease due to a lack of food.
75.

Which would a drought (not raining for long period) most likely affect?

a)

all organisms in a particular ecosystem

b)

only the plants in a particular ecosytem

c)

only the animals in a particular ecosystem

76.
Which best describes mutualism?
a)
Ticks live and feed on dogs and other animals’ blood to survive.
b)
Mushrooms send out long, underground structures which allow them to grow in other areas.
c)
Ants attack animals that try to feed on the acacia tree, and the ants feed on the nectar of the tree.
77.
Which term best describes two predators living in the same habitat who feed on the same prey?
a)
coexistence
b)
competition
c)
mutualism
78.
As a dog walks through thick brush, a tick attaches to its leg. Which best describes the relationship between the dog and the tick?
a)
parasitism
b)
mutualism
c)
commensalism
79.
Bees and butterflies help pollinate plants, enabling them to reproduce while getting nectar from those plants. Which is best represented by this relationship?
a)
mutualism
b)
parasitism
c)
competition
d)
predator-prey
80.
Which statement about parasitism is most correct?
a)
Both organisms benefit.
b)
Neither organism benefits.
c)
One organism benefits and the other is not affected.
d)
One organism benefits and the other is negatively affected.
81.
Which is the best example of predation in an ecosystem?
a)
bee and flower
b)
fox and rabbit
c)
flea and rat
d)
mosquito and human
82.
Which relationship shows how terrestrial and aquatic food webs are interconnected?
a)
A bird eats fish.
b)
A cow eats grass.
c)
A shark eats fish.
d)
A grasshopper eats grass.
83.
An energy pyramid is pictured.

Which statement best explains the flow of energy as it moves through the different levels?
a)
Energy decreases as it is lost as heat to the environment.
b)
Energy increases as it is gained from the environment.
c)
Energy is unavailable because it is used up by the organisms at Level 1.
d)
Energy is transferred as it is produced by organisms in the next level.
84.
A ________ ________ factor affects large populations and are often caused by overcrowding. For example: competition for food, water, shelter, space, and the quick spread of disease through a population.
a)
density dependent
b)
density independent
c)
symbiotic relationship
d)
primary consumer
85.
A ________ ________ factor affect all populations regardless of their size. For example: natural disasters and human activities (pollution).
a)
density dependent
b)
density independent
c)
symbiotic relationship
d)
predator prey
86.
A ________ relationship exists between organisms of two different species that live together in direct contact
a)
mutualistic
b)
commensalistic
c)
symbiotic
d)
parasitic
87.
________ is a symbiotic relationships in which one organisms benefits at the expense of the other organism. For example: a flea and a dog.
a)
parasitism
b)
commensalism
c)
mutualism
d)
predation
88.
Another name for a producer is an ________.
a)
autotroph
b)
heterotroph
c)
consumer
d)
michael bay
89.
The second trophic level includes ________ ________ or ________.
a)
primary consumer, herbivore
b)
primary consumer, omnivore
c)
secondary consumer, herbivore
d)
secondary consumer, omnivore
90.
Another name for a consumer is a ________.
a)
autotroph
b)
heterotroph
c)
producer
d)
cow
91.
As you move up an energy pyramid, energy is ________.
a)
lost
b)
gained
c)
mixed
d)
eaten
92.
In an ecosystem there are more ________ than ________.
a)
consumers, producers
b)
producers, consumers
c)
lions, birds
d)
energy, producers

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