BIOLOGY 171 Exam 2 Study Guide Answers

Exam 2 Practice Questions from GSIs and UTAs
These questions are written by GSIs and UTAs as a service to BIO171 students.
These are not written by the instructors who write the exams. Thus, they are
useful for reviewing material, but should not be seen as a preview of exam 2.




Given this figure of interactions among species, which of the following is the least likely interpretation?
A. Species A has an indirect effect on species C
B. Species A has a direct effect on species C
C. Species C has a direct effect on species D
D. Species C has an indirect effect on species D
E. Species B has an indirect effect on species D
ANSWER: D

, This figure shows pure exponential population growth for 3 bacterial species: A, B, and C. A, B, and C
refer to cultures of these 3 species grown in identical environments. Based on the data in this graph, what
can you infer?
A. r is greater for A than C
B. r is not changing over time for A, B, and C
C. r is changing over time for A but not C
D. λ is greater in A than in C
ANSWER: B
This plot shows the change in the population
size of Great Horned Owls in Ohio. Initially
(at time 0), there were 10 owls in the
population. Great Horned Owls typically lay
two eggs per clutch, and nest in hollow trees.
Population size is limited by competition for
hollow trees.




Estimate the carrying capacity of this species based on the plot._____(ANSWER: 500)