#Question id: 10652
#Section 2: Evolution
Which factors (limited space or overcrowding; limited food; Predators; parasite and diseased) tend to act in a density-dependent manner; Tony Sinclair (1989) many studies of density dependence in 51 populations of insects, 82 populations of large mammals, and 36 populations of small mammals and birds. Which of the following observation is most likely true?
a) Insects showed a wide variety of causes of density dependence and no one density-dependent factor was of overriding importance
b) The lesser the amount of available food, the greater the mortality of large mammals
c) Space and social interactions were more important for smaller mammals and birds, because they are more territorial
#Question id: 10653
#Section 2: Evolution
All offspring are produced in a single reproductive event, we term this pattern semelparity. Which of the following is characteristics feature for semelparity individuals?
a) Semelparity is common in insects and other invertebrates
b) Semelparous organisms may live for many years before reproducing
c) semelparity occur only in plant
d) In semelparity, exploitation competition is more common than interference competition
#Question id: 10654
#Section 2: Evolution
Complete the following hypothetical life table for a bird
What will be population size in next generation?
#Question id: 10655
#Section 2: Evolution
Which of the following statements about the evolution of life histories is correct?
A) Unstable environments with unlimited resources favor r-selected populations.
B) K-selected populations are most often found in environments where density-independent factors are important regulators of population size.
C) Most populations have both r- and K-selected characteristics that vary under different environmental conditions.
D) The reproductive efforts of r-selected populations are directed at producing just a few offspring with good competitive abilities.
#Question id: 10656
#Section 2: Evolution
Which of the following is an incorrect statement about the regulation of populations?
A) The logistic equation reflects the effect of density independent 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.
#Question id: 10657
#Section 2: Evolution
Assuming these age-structure diagrams describe human populations, in which population is unemployment likely to be a societal issue in the future?
