Eccb 403 exam 2 Exam Questions AND Correct Answers
: Some plants can produce both chemical and physical defenses against herbivory - ✔✔true
1) : For predators to play an important role in the evolution of prey characteristics, they must be able to
limit the density of their prey species. - ✔✔false
1) Consider the graph above of woodland caribou population growth rates observed at various
population sizes. What does this graph demonstrate? - ✔✔Allee effect
1) Grazing facilitation is the process by which: - ✔✔a. Grazing by one herbivore species improves the
food supply available to another herbivore species
1) Specialist predators tend to cause instability in prey numbers. - ✔✔true
1) The mathematical representations of predator-prey interactions that we presented in class are shown
in: - ✔✔b and c
they start off with dH/dT and dP/dT
(look for H and P)
1) The Optimal Defense Hypothesis states which of the following? - ✔✔a. Plants allocate resources to
defenses against herbivores in a way that optimizes plant growth
31. Considering the following box and arrow diagram which represents a compartment model for rabies,
which of the statements following the diagram is/are correct? - ✔✔The diagram represents the
dynamics of rabies in a closed population
31. If X, Y, and Z in the following equations are defined as the number of susceptible, infected, and
recovered individuals, respectively, in a closed population exposed to a disease, and N = X + Y + Z, which
, of the statements following the equations is/are correct? - ✔✔k1 represents the transmission rate per
encounter between X and Y
k2 represents the recovery rate of Y individuals
N is a constant
All the above
31. Simple compartment models of a population containing a disease could include: - ✔✔a. A
compartment for susceptible individuals
b. A compartment for infected individuals
c. A compartment for recovered individuals
d. All the above
31. Simple host parasite models can predict extinction, stability, or stable-cycles. - ✔✔true
31. The most critical parameter determining whether a disease will spread is: - ✔✔R0
31. The Red Queen hypothesis is: - ✔✔The idea that adaptations of one species are offset by selection
acting on other species in the community
According to your textbook, disease and parasitism cannot interact with competition and predation to
affect population dynamics - ✔✔false
Among the types of functional responses of predators to changes in prey abundance are - ✔✔Type I and
Type III Response
Among the types of numerical responses of predators to changes in prey abundance are -
✔✔Aggregative response
Compartment models are not very useful for answering questions about the stability of the host-disease
interaction - ✔✔false
: Some plants can produce both chemical and physical defenses against herbivory - ✔✔true
1) : For predators to play an important role in the evolution of prey characteristics, they must be able to
limit the density of their prey species. - ✔✔false
1) Consider the graph above of woodland caribou population growth rates observed at various
population sizes. What does this graph demonstrate? - ✔✔Allee effect
1) Grazing facilitation is the process by which: - ✔✔a. Grazing by one herbivore species improves the
food supply available to another herbivore species
1) Specialist predators tend to cause instability in prey numbers. - ✔✔true
1) The mathematical representations of predator-prey interactions that we presented in class are shown
in: - ✔✔b and c
they start off with dH/dT and dP/dT
(look for H and P)
1) The Optimal Defense Hypothesis states which of the following? - ✔✔a. Plants allocate resources to
defenses against herbivores in a way that optimizes plant growth
31. Considering the following box and arrow diagram which represents a compartment model for rabies,
which of the statements following the diagram is/are correct? - ✔✔The diagram represents the
dynamics of rabies in a closed population
31. If X, Y, and Z in the following equations are defined as the number of susceptible, infected, and
recovered individuals, respectively, in a closed population exposed to a disease, and N = X + Y + Z, which
, of the statements following the equations is/are correct? - ✔✔k1 represents the transmission rate per
encounter between X and Y
k2 represents the recovery rate of Y individuals
N is a constant
All the above
31. Simple compartment models of a population containing a disease could include: - ✔✔a. A
compartment for susceptible individuals
b. A compartment for infected individuals
c. A compartment for recovered individuals
d. All the above
31. Simple host parasite models can predict extinction, stability, or stable-cycles. - ✔✔true
31. The most critical parameter determining whether a disease will spread is: - ✔✔R0
31. The Red Queen hypothesis is: - ✔✔The idea that adaptations of one species are offset by selection
acting on other species in the community
According to your textbook, disease and parasitism cannot interact with competition and predation to
affect population dynamics - ✔✔false
Among the types of functional responses of predators to changes in prey abundance are - ✔✔Type I and
Type III Response
Among the types of numerical responses of predators to changes in prey abundance are -
✔✔Aggregative response
Compartment models are not very useful for answering questions about the stability of the host-disease
interaction - ✔✔false
