Succession — Unit test Answers

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1
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Lions live in groups called prides. Lion populations would most likely fall in which category of population distribution?

A
even
B
random
C
clumped
D
density
2
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Invasive species often unbalance the ecosystems into which they are introduced because _______.

A
they did not co-evolve with the natural species and lack natural controls, like predators
B
they breed quickly and have the potential to overpopulate an area
C
they consume local resources
D
none of the above
3

Which of the following is not an example of mechanical control of nonnative species?

A
pulling
B
inspections
C
net barriers
D
mowing
4

Which of the following limiting factors would be directly affected by a drought?

A
birth/death rate
B
immigration
C
available niche
D
resource supply
5

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
6

Secondary succession occurs in ecosystems without soil.

A
T
B
F
7

There are approximately 30,000,000 white-tailed deer in the United States, which covers 3,536,000 square miles. What is the population density, rounded to the nearest whole number, for the white-tailed deer?

A
2 deer per square mile
B
4 deer per square mile
C
6 deer per square mile
D
8 deer per square mile
8

Which of the following statements about exponential growth curves is true?

A
Exponential growth curves are common for R-selected species.
B
Exponential growth curves show fast growth rates followed by slow growth rates.
C
No organisms in nature experience exponential growth rates.
D
Exponential growth curves are S-shaped.
9

Succession occurs after ecosystems experience some type of disruptive event.

A
T
B
F
10

The _______ is the total number of organisms that an ecosystem can support.

A
tolerance range
B
carrying capacity
C
competitive exclusion principle
D
population
11

Which of the following is not a way that nonnative organisms are introduced to new aquatic ecosystems related to commerce?

A
cargo ship hulls
B
recreational boats
C
escape from aquariums
D
migration
12

Which method to determine population size is the least invasive?

A
mark/recapture
B
direct observation
C
sampling
D
indirect observation
13

For which method of determining population size is the population not aware of the sampler’s presence?

A
mark/recapture
B
direct observation
C
sampling
D
indirect observation
14

Which of the following could be both a natural and a human cause of succession?

A
lava flow
B
overcutting
C
fire
D
wind
15

Succession is always caused by natural events.

A
T
B
F
16

Which of the following would most likely be a cause of primary succession?

A
farming
B
overhunting
C
volcano
D
defoliation
17

Tagging animals is indicative of which type of method to determine population size?

A
mark/recapture
B
direct observation
C
sampling
D
indirect observation
18

Succession performs a variety of functions within ecosystems. What is the main reason that succession is important in maintaining ecosystems?

A
Succession allows the earth to change.
B
Succession ultimately leads to climax communities, which are stable and sustainable.
C
Succession keeps pollution from harming ecosystems.
D
Succession allows simple organisms to play a larger role in ecosystems than normal.
19

Ships that use ballast water are not in danger of introducing invasive species into aquatic habitats.

A
T
B
F
20

Which of the following is an example of mechanical control of nonnative species?

A
pesticides
B
herbicides
C
net barriers
D
inspections

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