Topic Test Answers

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1
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Which of the following would not cause habitat change?

A
building a dam on a river
B
a hurricane
C
introducing new hiking trails
D
none of the above
2
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Which of the following statements about secondary succession is true?

A
Secondary succession occurs in ecosystems that have no vegetation.
B
Secondary succession affects ecosystems that are already established.
C
Ecosystems require pioneer species to undergo secondary succession.
D
Secondary succession can occur in areas without soil.
3

Which of the following best describes the impact of glaciers upon the surface of the earth?

A
Ice buried continents under a few hundred feet of ice.
B
Glaciers scraped across the surface and altered landscapes and the course of rivers.
C
The passage of glaciers created new ecosystems.
D
All of the above.
4

Global warming is a theory accepted by a majority of scientists.

A
T
B
F
5

Succession allows ecosystems to _______.

A
recover from disruptive events
B
reach a stable and sustainable point
C
establish complex communities
D
all of the above
6

Natural disasters can have positive effects on an ecosystem.

A
T
B
F
7

Manmade global warming is caused by _______.

A
pollution
B
water vapor
C
farms
D
species extinction
8

Succession occurs because _______.

A
organisms gradually change the environment
B
climax communities are not possible
C
dominant organisms drive out pioneer species
D
ecosystems never reach a sustainable point
9

Greenhouse gases are best described as _______.

A
the result of fossil fuel use
B
gases that cause the greenhouse effect
C
carbon dioxide and methane
D
gases that trap energy from the sun in Earth’s atmosphere
10

Which of the following is not a consequence of the onset of early spring events?

A
flowering
B
acidic ocean water
C
fruit ripening
D
hatching eggs
11

Many scientists expect global temperatures to _______ by 2100.

A
rise 0.4-1.4ºC
B
rise 1.4-5.8ºC
C
fall 0.4-1.4ºC
D
fall 1.4-5.8ºC
12

Primary succession ________.

A
is caused solely by human events
B
occurs on preexisting soil
C
occurs in areas without soil
D
becomes normalized by climax species
13

Explain why entering an interglacial period resulted in an increase in biodiversity on Earth.

Answer not available
14

Without the greenhouse effect, Earth would be _______.

A
too cold to support our current ecosystem
B
too warm to support our current ecosystem
C
too wet to support our current ecosystem
D
barren of all life
15

A longer growing season is a result of _______.

A
an earlier start to spring
B
earlier animal migration
C
species having a narrow temperature range tolerance
D
invasive species

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