Answers26.3611055 ECSD Environmental Science FICUnit Test

Cumulative Midterm Exam Answers

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1
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Mammals were not contemporaries of the dinosaurs.

A
T
B
F
2
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Freshwater biomes have _______.

A
organisms adjusted to high salinity
B
more diversity than marine biomes
C
a salinity of less than 1%
D
the ability to maintain their temperature year round
3

Which of the following is not a source of air pollution related to human activities?

A
gasoline
B
garbage
C
forest fires
D
radon
4

Which of the following statements about air pollution is not true?

A
Air pollution is caused by natural and human processes.
B
Carbon monoxide and sulfur oxides are common air pollutants.
C
Natural components of air, like carbon dioxide, cannot be considered air pollutants.
D
Primary and secondary pollutants are harmful to human health and the environment.
5

Alternative energy sources are always dependent upon favorable weather conditions.

A
T
B
F
6

Yellowstone National Park has 124 wolves living in it. The park covers 3472 square miles. What is the population density of wolves living in Yellowstone?

Question illustration
A
28 wolves/mi
B
0.0357 wolves/mi
C
82 wolves/mi
D
43 wolves/mi
7

Which of the following is not a method to determine population size?

A
mark/recapture
B
sampling
C
hypothesis
D
observation
8

Why do many fishermen support efforts to protect and restore mangrove forests?

A
Most fishermen are environmentalists.
B
Many fish breed in mangrove forests.
C
They lay their nets in mangrove forests.
D
Mangrove forests provide valuable hardwoods.
9

The greenhouse effect _______.

A
is essential for life on Earth
B
warms Earth’s atmosphere
C
is a natural phenomenon
D
all of the above
10

Which of the following is considered an arid biome?

A
grassland
B
desert
C
savanna
D
rainforest
11

Which of the following best explains why air pollution that was once blamed for global cooling is now considered responsible for global warming?

A
Pollution began reflecting sunlight and heat rather than absorbing it.
B
Evidence of global warming became overwhelming.
C
Scientists mistakenly thought pollution reflected sunlight and heat rather than absorbed it.
D
Congress required scientists to assign a cause to global climate change.
12

Fish rely on coral for _______.

A
shelter
B
food supply
C
camouflage
D
all of the above
13

Which of the following species is an R-selected species?

A
Giant tortoises
B
Mosquitoes
C
Elephants
D
Redwoods
14

Which of the following statements about the phosphorus cycle is true?

A
In living organisms, phosphorus can be found in nucleic acids.
B
Phosphorus in aquatic ecosystems is only found in sediment.
C
Elevated levels of phosphorus in aquatic ecosystems is always beneficial.
D
The soil plays no part in the phosphorus cycle.
15

What organism is the main producer in freshwater ecosystems?

A
phytoplankton
B
zooplankton
C
anaerobic bacteria
D
none of the above
16

Which of the following statements about biodiversity is not true?

A
Changes to biodiversity never occur naturally.
B
Changes to biodiversity can lead to a decrease in ecosystem stability.
C
Changes to biodiversity can positively and negatively affect on an ecosystem.
D
Changes to biodiversity can lead to an increase in ecosystem stability.
17

The widespread loss of wetlands would have little effect on the overall health of the environment.

A
T
B
F
18

Which of the following about abiotic factors in ecosystems is true?

A
Abiotic factors in healthy ecosystems are not in balance.
B
Abiotic factors are located in the soil of ecosystems only.
C
Abiotic factors are part of a dynamic system.
D
Abiotic factors in ecosystems are used up by the living components.
19

Global climate change will have no impact to life on the Earth.

A
T
B
F
20

The ozone layer helps sustain life by absorbing a large amount of incoming UV radiation.

A
T
B
F

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