Online Exam 3_03
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Part 1 of 1 – 95.0/ 100.0 Points
Question 1 of 20 5.0/ 5.0 Points
The age of a tree is best approximated by:
A. estimating tree height.
B. counting tree growth rings.
C. measuring the diameter of a trunk at breast height (dbh).
D. counting the number of leaves.
Question 2 of 20 5.0/ 5.0 Points
Which of the following factors is most likely to be a density-independent regulator of population
growth?
A. Drought
B. Disease
C. Starvation
D. Parasites
Question 3 of 20 5.0/ 5.0 Points
The area inhabited by all individuals of a particular species is known as this population’s:
A. geographic range.
B. density.
C. ecosystem.
D. habitat.
Question 4 of 20 5.0/ 5.0 Points
As population density increases in harp seals (Phoca groenlandica), females:
A. become sexually mature at a smaller body size.
B. refuse to mate with males.
C. begin reproduction at a later age.
D. often cannibalize their own offspring.
Question 5 of 20 5.0/ 5.0 Points
As the density of a population increases, the:
A. survival rate increases.
B. reproductive rate increases.
C. intensity of intraspecific competition decreases.
D. individual growth rate decreases.
Question 6 of 20 5.0/ 5.0 Points
When extreme contest competition occurs within a population:
A. all individuals receive insufficient resources for survival and reproduction.
B. local extinction may occur.
C. only a portion of the population suffers.
D. the growth rate of the population increases.
Question 7 of 20 5.0/ 5.0 Points
A population that is growing has a net reproductive rate (R0) that is:
A. = 0.
