AnswersFL-2001340-Environmental Science Sem 2Global Change

Topic Test Answers

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1
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Which of the following is not a characteristic of a climax community?

A
high levels of biodiversity
B
presence of complex organisms
C
conditions suitable for all organisms
D
experiences no change
2
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“In a 2009 study, presented by the National Academy of Science, 97% of climate scientists agree that human activity is causing global warming." Which of the following statements is best supported by this study?

A
Most climate scientists dispute the theory of human influence on global warming.
B
Global warming is most likely alarmist propaganda based on false data.
C
Global warming is definitely not caused by human influence on nature.
D
Most climate scientists believe that there is evidence that explains global warming.
3

Which of the following is the most likely cause for global climate change?

A
a decrease in the overall temperature of the Earth
B
an increase in the overall temperature of the Earth
C
an increase in the number of cold climates
D
no change to global climate
4

All scientists agree that global climate change will happen rapidly.

A
T
B
F
5

Habitat change occurs more frequently through natural causes than human activity.

A
T
B
F
6

Without the greenhouse effect the Earth would be _______ than it is today.

A
warmer
B
drier
C
colder
D
wetter
7

Succession occurs after ecosystems experience some type of disruptive event.

A
T
B
F
8

The increased ranges of plant and insect species resulting from climate change has only negative consequences.

A
T
B
F
9

Why was the concern over global cooling replaced with a concern over global warming?

A
The science community needed a cause to frighten the general population.
B
Steady surface temperature increases were noted between the 1970’s and 90’s.
C
Air pollution only became a concern in the 1980’s.
D
Scientists observed severe ocean acidification.
10

Ecosystems have trouble adjusting to short-term changes.

A
T
B
F
11

Secondary succession occurs in ecosystems without soil.

A
T
B
F
12

Which of the following is not true concerning the Pleistocene ice age?

A
Earth began warming out of the ice age 18,000 years ago.
B
Glaciers stopped advancing 15,000 years ago.
C
Sea levels during the ice age were higher than today.
D
Forests and grasslands became more common after the ice age.
13

How is a climax community different than a primitive community?

A
The types of organisms present in a climax community are more complex.
B
Primitive communities tend to have less biodiversity than climax communities.
C
Climax communities are more stable than primitive communities.
D
All of the above
14

It is not possible for global warming to have any positive side effects.

A
T
B
F
15

Greenhouse gases are essential to support life on earth.

A
T
B
F
16

Which of the following about secondary succession is not true?

A
It occurs in ecosystems without soil.
B
It occurs in ecosystems that are already established.
C
It reduces the number of species in an ecosystem.
D
It is initiated by a disruptive event.
17

How do the benefits of natural change to ecosystems compare to the disadvantages?

A
The benefits are outweighed by the disadvantages.
B
The benefits outweigh the disadvantages.
C
The benefits are equal to the disadvantages.
D
There are no disadvantages to natural change in ecosystems.
18

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.
19

Which of the following is not a possible effect of rising carbon dioxide levels on plants?

A
increased photosynthesis
B
increased plant mortality
C
increased crop productivity
D
increased plant growth
20

Which of the following is not a manmade cause of global warming?

A
burning fossil fuels
B
deforestation
C
respiration
D
population growth

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