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Practice Test Answers

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Barnacles and whales have a commensalistic relationship in which barnacles benefit. What would most likely happen to the whale population if the barnacle population decreased?

A
stay the same
B
decrease
C
become extinct
D
increase
2
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Which statement best describes the purpose of Earth's spheres?

A
They work together as open systems to cycle matter through ecosystems.
B
They work independently as closed systems to cycle matter through ecosystems.
C
They work independently as closed systems to move nutrients to living and nonliving parts of Earth.
D
They work together as open systems to move matter to living and nonliving parts of Earth.
3

Natural resources are classified as renewable and nonrenewable. What is the difference between the two?

A
whether or not the resource can be replaced
B
whether or not the resource exists in nature
C
whether or not the resource is useful to humans
D
whether or not the resource dwindles in supply
4

Pandas eat bamboo for energy. What are pandas classified as?

A
consumers
B
producers
C
decomposers
D
autotrophs
5

How does mining impact the environment?

A
It has a positive impact on the environment by releasing chemicals into the environment.
B
It has a negative impact on the environment by providing new niches for wildlife to inhabit.
C
It has a positive impact on the environment by permanently altering the ecosystem.
D
It has a negative impact on the environment by allowing toxic chemicals to harm wildlife.
6

Which statement best compares the carbon cycle and the nitrogen cycle?

A
Both cycle water from Earth's surface to the atmosphere.
B
Both involve the work of decomposers.
C
Both require fixation in order to convert molecules.
D
Both release oxygen as a waste product.
7

A relationship in which one organism benefits while the other is neither harmed nor helped is called

A
predation.
B
mutualism.
C
commensalism.
D
parasitism.
8

Which of these could result in secondary succession?

A
the formation of a tall sand dune on a previously grassy beach
B
a vast glacier in motion forming a U-shaped valley in its wake
C
an introduced species that destroys all the native plants in an area
D
a volcanic eruption that covers most of what used to be a forest
9

How does conservation affect biodiversity?

A
It decreases ecosystem diversity.
B
It decreases species diversity.
C
It helps to preserve climate change.
D
It helps to preserve biodiversity.
10

What is the primary source of energy in a food chain?

A
water
B
sun
C
oxygen
D
carbon dioxide

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