BIO 320 EXAM 3 2025 | ALL QUESTIONS AND CORRECT ANSWERS |
BIO 320 Exam 3
GRADED A+ | VERIFIED ANSWERS | LATEST EXAM (JUST RELEASED
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1. In a rank-abundance curve comparing two communi- C
ties, the community with the greater
species richness is characterized by a
A) lesser length of the curve and a more gradual slope.
B) lesser length of the curve and a steeper slope.
C) greater length of the curve and a more gradual
slope.
D) greater length of the curve and a steeper slope
2. Which description is true for most communities? D
A) All species have approximately equal abundances.
B) All species are rare.
C) All species are common.
D) A few species are common and the remainder are
rare
3. Dominant species tend to be more abundant than oth- B
er species because they
A) prey upon or parasitize other species.
B) outcompete other species.
C) are preyed upon less than other species.
D) reproduce more rapidly than other species.
4. Which statement best describes a keystone species? A
A) a rare or uncommon species that has a strong effect
on its community
B) an abundant species that may or may not affect
other species
C) a species that takes up a great deal of space in a
community
D) a common species that has a strong effect on its
community
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5. The species at the top of a food web C
A) do not prey on other species and are not subject to
predation.
B) do not prey on other species and are subject to
predation.
C) prey on other species and are not subject to preda-
tion.
D) prey on other species and are subject to predation.
6. Within a food web, herbivores are considered to be B
A) basal species
B) intermediate species
C) top predators
D) represented at any level
7. Considerable evidence indicates that the null model of D
community structure is incorrect
because
A) each species responds independently of other
species to the prevailing physical environment
B) interactions among species have no significant in-
fluence on community structure
C) when one species is removed, the populations of the
other species are unaffected
D) species interactions modify the fundamental niche
of the species involved, influencing
their relative abundance and, in some cases, their dis-
tribution
8. Experiments on competition among species within a C
community reveal that
A) removing a single species or a group of species has
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relatively little effect on a
community
B) removing a single species has a stronger effect than
removing a group of species from a
community
C) removing a group of species has a stronger effect
than removing a single species from a
community
D) none of the above
9. When apparent competition occurs, the B
A) populations of predator and prey species are small-
er.
B) predator species population is larger and the prey
species populations are smaller
C) the predator species population is smaller and the
prey species populations are larger
D) populations of predator and prey species are larger
10. Food webs are typically arranged into trophic levels A
with
A) primary producers at the bottom, herbivores in the
middle, and carnivores at the top
B) herbivores at the bottom, carnivores in the middle,
and primary producers at the top
C) carnivores at the bottom, herbivores in the middle,
and primary producers at the top
D) primary producers at the bottom, carnivores in the
middle, and herbivores at the top
11. When top-down control occurs within an intertidal D
zone along the rocky coastline of the
BIO 320 Exam 3
GRADED A+ | VERIFIED ANSWERS | LATEST EXAM (JUST RELEASED
Study online at https://quizlet.com/_gwpdqm
1. In a rank-abundance curve comparing two communi- C
ties, the community with the greater
species richness is characterized by a
A) lesser length of the curve and a more gradual slope.
B) lesser length of the curve and a steeper slope.
C) greater length of the curve and a more gradual
slope.
D) greater length of the curve and a steeper slope
2. Which description is true for most communities? D
A) All species have approximately equal abundances.
B) All species are rare.
C) All species are common.
D) A few species are common and the remainder are
rare
3. Dominant species tend to be more abundant than oth- B
er species because they
A) prey upon or parasitize other species.
B) outcompete other species.
C) are preyed upon less than other species.
D) reproduce more rapidly than other species.
4. Which statement best describes a keystone species? A
A) a rare or uncommon species that has a strong effect
on its community
B) an abundant species that may or may not affect
other species
C) a species that takes up a great deal of space in a
community
D) a common species that has a strong effect on its
community
, BIO 320 Exam 3
Study online at https://quizlet.com/_gwpdqm
5. The species at the top of a food web C
A) do not prey on other species and are not subject to
predation.
B) do not prey on other species and are subject to
predation.
C) prey on other species and are not subject to preda-
tion.
D) prey on other species and are subject to predation.
6. Within a food web, herbivores are considered to be B
A) basal species
B) intermediate species
C) top predators
D) represented at any level
7. Considerable evidence indicates that the null model of D
community structure is incorrect
because
A) each species responds independently of other
species to the prevailing physical environment
B) interactions among species have no significant in-
fluence on community structure
C) when one species is removed, the populations of the
other species are unaffected
D) species interactions modify the fundamental niche
of the species involved, influencing
their relative abundance and, in some cases, their dis-
tribution
8. Experiments on competition among species within a C
community reveal that
A) removing a single species or a group of species has
, BIO 320 Exam 3
Study online at https://quizlet.com/_gwpdqm
relatively little effect on a
community
B) removing a single species has a stronger effect than
removing a group of species from a
community
C) removing a group of species has a stronger effect
than removing a single species from a
community
D) none of the above
9. When apparent competition occurs, the B
A) populations of predator and prey species are small-
er.
B) predator species population is larger and the prey
species populations are smaller
C) the predator species population is smaller and the
prey species populations are larger
D) populations of predator and prey species are larger
10. Food webs are typically arranged into trophic levels A
with
A) primary producers at the bottom, herbivores in the
middle, and carnivores at the top
B) herbivores at the bottom, carnivores in the middle,
and primary producers at the top
C) carnivores at the bottom, herbivores in the middle,
and primary producers at the top
D) primary producers at the bottom, carnivores in the
middle, and herbivores at the top
11. When top-down control occurs within an intertidal D
zone along the rocky coastline of the
