1|Page
BIO 320 EXAM 3 LATEST 2026-2027 ACTUAL EXAM WITH COMPLETE
QUESTIONS AND CORRECT DETAILED ANSWERS (100% VERIFIED
ANSWERS) |ALREADY GRADED A+| ||PROFESSOR VERIFIED||
||BRANDNEW!!!||
In a forest community, the layer in which most photosynthesis
occurs is the
A) canopy
B) midstory
C) understory
D) forest floor - ANSWER-A
The layer of a forest in which decomposition takes place and
mineral nutrients are released
for reuse by plants is called the
A) canopy
B) understory
C) herb layer.
D) forest floor - ANSWER-D
,2|Page
In a well-stratified lake in summer, the subsurface layer of water,
which is characterized by a
steep and rapid decline in temperature with depth, is called the
A) epilimnion.
B) metalimnion
C) hypolimnion
D) benthic zone - ANSWER-B
Zonation within a community is typically the result of differences in
the
A) patterns of predation among species within a community.
B) rates of reproduction among species within a community.
C) patterns of competition among species within a community.
D) physical characteristics of the environment across a spatial
gradient. - ANSWER-D
In a sandy beach community, ghost crabs and beach flies occur
within
A) the supratidal zone
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B) the intertidal zone
C) the subtidal zone
D) any tidal zone - ANSWER-A
An ecologist samples the abundance of various species along an
environmental gradient and
fails to find clusters of species. Instead, peaks of abundance of
dominant species are merely
randomly spaced segments along a continuum. This distribution
of species supports the
A) unified concept of a community.
B) organismic concept of a community.
C) individualistic or continuum concept of a community.
D) successional concept of a community - ANSWER-C
In aquatic environments, the three major environmental gradients
of water that directly
influence the distribution and dynamics of communities include
A) temperature, depth, and oxygen content.
, 4|Page
B) depth, flow rate, and salinity.
C) pressure, temperature, and depth.
D) flow rate, salinity, and oxygen content - ANSWER-B
As the degree of environmental heterogeneity of a community
increases, the number of plant
and animal species tends to
A) decrease
B) remain the same
C) increase
D) increase initially and then decrease - ANSWER-C
As the fertility of soil on the forest floor increases, the
A) growth rate of plants increases
B) size of plants decreases
C) density of plants decreases
D) number of species of plants increases - ANSWER-A
BIO 320 EXAM 3 LATEST 2026-2027 ACTUAL EXAM WITH COMPLETE
QUESTIONS AND CORRECT DETAILED ANSWERS (100% VERIFIED
ANSWERS) |ALREADY GRADED A+| ||PROFESSOR VERIFIED||
||BRANDNEW!!!||
In a forest community, the layer in which most photosynthesis
occurs is the
A) canopy
B) midstory
C) understory
D) forest floor - ANSWER-A
The layer of a forest in which decomposition takes place and
mineral nutrients are released
for reuse by plants is called the
A) canopy
B) understory
C) herb layer.
D) forest floor - ANSWER-D
,2|Page
In a well-stratified lake in summer, the subsurface layer of water,
which is characterized by a
steep and rapid decline in temperature with depth, is called the
A) epilimnion.
B) metalimnion
C) hypolimnion
D) benthic zone - ANSWER-B
Zonation within a community is typically the result of differences in
the
A) patterns of predation among species within a community.
B) rates of reproduction among species within a community.
C) patterns of competition among species within a community.
D) physical characteristics of the environment across a spatial
gradient. - ANSWER-D
In a sandy beach community, ghost crabs and beach flies occur
within
A) the supratidal zone
,3|Page
B) the intertidal zone
C) the subtidal zone
D) any tidal zone - ANSWER-A
An ecologist samples the abundance of various species along an
environmental gradient and
fails to find clusters of species. Instead, peaks of abundance of
dominant species are merely
randomly spaced segments along a continuum. This distribution
of species supports the
A) unified concept of a community.
B) organismic concept of a community.
C) individualistic or continuum concept of a community.
D) successional concept of a community - ANSWER-C
In aquatic environments, the three major environmental gradients
of water that directly
influence the distribution and dynamics of communities include
A) temperature, depth, and oxygen content.
, 4|Page
B) depth, flow rate, and salinity.
C) pressure, temperature, and depth.
D) flow rate, salinity, and oxygen content - ANSWER-B
As the degree of environmental heterogeneity of a community
increases, the number of plant
and animal species tends to
A) decrease
B) remain the same
C) increase
D) increase initially and then decrease - ANSWER-C
As the fertility of soil on the forest floor increases, the
A) growth rate of plants increases
B) size of plants decreases
C) density of plants decreases
D) number of species of plants increases - ANSWER-A
