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Chapter 52



Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 

All of the following phrases could characterize a population except
a.
interacting individuals.
b.
dispersion.
c.
density.
d.
several species.
e.
boundaries.
 

 2. 

The most common kind of dispersion in nature is
a.
clumped.
b.
random.
c.
uniform.
d.
indeterminate.
e.
dispersive.
 

 3. 

A table listing such items as age, observed number of organisms alive each year, and life expectancy is known as a (an)
a.
life table.
b.
mortality table.
c.
survivorship table.
d.
rate table.
e.
insurance table.
 

 4. 

Natural selection has led to the evolution of diverse natural history strategies, which have in common
a.
many offspring per reproductive episode.
b.
limitation by density-dependent limiting factors.
c.
adaptation to stable environments.
d.
maximum lifetime reproductive success.
e.
relatively large offspring.
 

 5. 

In the logistic equation dN/dt = rN, chpt52_files/i0060000.jpg, r is a measure of the population's intrinsic rate of increase. It is determined by which of the following?
a.
birth rate
b.
death rate
c.
density
d.
A and B only
e.
A, B, and C
 

 6. 

Often the growth cycle of one population has an effect on the cycle of another-as moose populations increase, wolf populations also increase. Thus, if we are considering the logistic equation for the wolf population,dN/dt = rN, chpt52_files/i0070000.jpg, which of the factors accounts for the effect on the moose population?
a.
r
b.
N
c.
rN
d.
K
e.
dt
 

 7. 

All of the following characteristics are typical of an r-selected population except
a.
occurrence in variable environments.
b.
high intrinsic rate of growth.
c.
onset of reproduction at an early age.
d.
extensive parental care of offspring.
e.
occurrence in open habitats.
 

 8. 

Which of the following is an incorrect statement about the regulation of populations?
a.
The logistic equation reflects the effect of density-dependent factors, which can ultimately stabilize populations around the carrying capacity.
b.
Density-independent factors have an increasingly greater effect as a population's density increases.
c.
High densities in a population may cause physiological changes that inhibit reproduction.
d.
Because of the overlapping nature of population-regulating factors, it is often difficult to precisely determine their cause-and-effect relationships.
e.
The occurrence of population cycles in some populations may be the result of crowding or lag times in the response to density-dependent factors.
 

 9. 

Which of the following is a density-independent factor limiting human population growth?
a.
social pressure for birth control
b.
earthquakes
c.
plagues
d.
famines
e.
pollution
 
 
The following questions refer to the figure below, which depicts the age structure of three populations.

chpt52_files/i0110000.jpg
 

 10. 

Which population is in the process of decreasing?
a.
I
b.
II
c.
III
d.
I and II
e.
II and III
 



 
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