ECCB 403 EXAM 3 QUESTIONS WITH
VERIFIED ANSWERS. A+ GRADE
2025/2026.
Chapter 14 -
Thinking about the diagram summarizing population regulation that we discussed in class,
which of the following was not among the factors hypothesized as density-dependent
mechanisms of intraspecific population regulation:
E. Pollution - ANS a. Behavior
b. Stress
c. Genetic
d. Dispersal
e. Pollution
In an unstable environment, one would expect that _____ limit population growth.
a. Density-independent factors - ANS a. Density-independent factors
b. Density-dependent factors
c. Both density-independent and density-dependent factors
In a stable environment, one would expect that _____ limit population growth.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
, b. Density-dependent factors - ANS a. Density-independent factors
b. Density-dependent factors
c. Both density-independent and density-dependent factors
Which of the following factors represent the state of a population as stability decreases due to
increasing stochastic variation?
e. a and c above - ANS a. Biotic decoupling
b. Over-connectedness
c. Abiotic limitation
d. Limit cycles and chaos
e. a and c above
True or false: Within the context of population regulation and limitation, a factor is defined as a
limiting factor if a change in the factor produces a change in the average, or equilibrium,
density of a population. - ANS
The first principle of population regulation states: - ANS a. All population processes are
directly or indirectly density dependent.
b. No closed population (i.e., without immigration or emigration) stops increasing unless either
the per capita birth rate or the per capita death rate is density dependent.
c. There are limits to growth.
d. All the above
The second principle of population regulation states: - ANS a. Differences in equilibrium
densities of two populations do not stop increasing unless either the per capita birth rate or the
per capita death rate is density dependent.
b. Population processes obey the laws of thermodynamics.
c. Differences in equilibrium densities of two populations can be caused by variation in either
density dependent or density independent per capita birth or death rates.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
VERIFIED ANSWERS. A+ GRADE
2025/2026.
Chapter 14 -
Thinking about the diagram summarizing population regulation that we discussed in class,
which of the following was not among the factors hypothesized as density-dependent
mechanisms of intraspecific population regulation:
E. Pollution - ANS a. Behavior
b. Stress
c. Genetic
d. Dispersal
e. Pollution
In an unstable environment, one would expect that _____ limit population growth.
a. Density-independent factors - ANS a. Density-independent factors
b. Density-dependent factors
c. Both density-independent and density-dependent factors
In a stable environment, one would expect that _____ limit population growth.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
, b. Density-dependent factors - ANS a. Density-independent factors
b. Density-dependent factors
c. Both density-independent and density-dependent factors
Which of the following factors represent the state of a population as stability decreases due to
increasing stochastic variation?
e. a and c above - ANS a. Biotic decoupling
b. Over-connectedness
c. Abiotic limitation
d. Limit cycles and chaos
e. a and c above
True or false: Within the context of population regulation and limitation, a factor is defined as a
limiting factor if a change in the factor produces a change in the average, or equilibrium,
density of a population. - ANS
The first principle of population regulation states: - ANS a. All population processes are
directly or indirectly density dependent.
b. No closed population (i.e., without immigration or emigration) stops increasing unless either
the per capita birth rate or the per capita death rate is density dependent.
c. There are limits to growth.
d. All the above
The second principle of population regulation states: - ANS a. Differences in equilibrium
densities of two populations do not stop increasing unless either the per capita birth rate or the
per capita death rate is density dependent.
b. Population processes obey the laws of thermodynamics.
c. Differences in equilibrium densities of two populations can be caused by variation in either
density dependent or density independent per capita birth or death rates.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
