AnswersVA-Ecology -CRPR 26-27 MC S1Freshwater and Marine Biomes

Freshwater and Marine Biomes — Unit test Answers

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1
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Why was the reduction of the bison population to under 1,000 individuals a bottleneck event for the species?

A
It drastically reduced the gene pool of the species.
B
It reduced the territorial range available to the species.
C
Foreign genes were introduced by crossbreeding with cattle.
D
It reduced the prevalence of recessive traits.
2
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Energy producing technologies can positively impact soil fertility.

A
T
B
F
3

Which of the following is not true concerning the elements of a quality life?

A
It might include financial and physical security.
B
They are considered stable over a lifetime.
C
It is highly individualized.
D
It depends upon personal environment and relationships.
4

Which of the following statements about human society and limiting factors is true?

A
Modifications made to the environment to reduce the impact of limiting factors can cause disruption to the natural balance of an ecosystem.
B
Humans cannot modify their environment to adapt it to their needs.
C
Humans can completely overcome the factors that limit population size.
D
Limiting factors are of no concern to human society, because they do not affect human populations.
5

Which of the following statements about energy producing technologies is true?

A
Some currently used energy producing technologies have no disadvantages.
B
Alternatives to nonrenewable energy sources can be as effective.
C
Air pollution is common to all energy producing technologies.
D
Alternatives to nonrenewable energy sources are typically more damaging to the environment.
6

Which of the following is not a reason that small societies can maintain stability in the long term better than larger societies?

A
Smaller societies have a smaller demand for resources.
B
Smaller societies can be governed by internal controls more effectively than larger societies.
C
Smaller societies rely more heavily on legislation and military forces.
D
Smaller societies tend to have stronger interpersonal relationships.
7

The events that lead to genetic drift are _______.

A
always natural disasters
B
random
C
predictable
D
related to human activities
8

How many kilocalories of energy would you expect a person in contemporary England to consume daily (including food, transportation, household use, etc.)?

A
millions
B
hundreds of thousands
C
tens of thousands
D
thousands
9

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

A
tolerance range
B
carrying capacity
C
competitive exclusion principle
D
population
10

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
11

Natural selection is an evolutionary mechanism by which _______.

A
advantageous traits are eliminated in a population
B
advantageous traits become more common in a population
C
inherited traits pass consistently through generations
D
organisms choose which traits to look for in their offspring
12

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
13

Which of the following statements about the effects of agricultural techniques on the environment is true?

A
Fertilizer used for agriculture can enter bodies of water, causing eventual oxygen depletion.
B
Pesticides and herbicides are potentially harmful to bodies of water only before they degrade.
C
Agricultural practices have limited impact on the surrounding environment.
D
Tillage is an important agricultural practice that has no known environmental impact.
14

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.
15

Large-scale environmental catastrophes _______.

A
result from human activities
B
have a negative impact on ecosystems
C
affect a variety of environmental factors
D
all of the above
16

Which of the following is not a reason that populations display a regular (evenly spaced) distribution?

A
territorial behavior
B
competition for water
C
competition for sunlight
D
social behavior
17

Humans living in highly populated areas are more inclined to _______.

A
violence
B
socially isolate
C
appetite loss
D
all of the above
18

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
19

Which method to determine population size is the least invasive?

A
mark/recapture
B
direct observation
C
sampling
D
indirect observation
20

Which of the following methods involves counting the number of organisms in a specific area?

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

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