BIO 320 EXAM 3 NEWEST 2025 ACTUAL EXAM

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BIO 320 EXAM 3 NEWEST 2025 ACTUAL EXAM

COMPLETE 100 QUESTIONS AND CORRECT

DETAILED ANSWERS (VERIFIED ANSWERS)

|ALREADY GRADED A+

When apparent competition occurs, the

• populations of predator and prey species are smaller.
• predator species population is larger and the prey species

populations are smaller

• the predator species population is smaller and the prey

species populations are larger

• populations of predator and prey species are larger -

ANSWER-B

Food webs are typically arranged into trophic levels with

• primary producers at the bottom, herbivores in the middle,

and carnivores at the top

• herbivores at the bottom, carnivores in the middle, and

primary producers at the top

• carnivores at the bottom, herbivores in the middle, and

primary producers at the top 1 / 4

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• primary producers at the bottom, carnivores in the middle,

and herbivores at the top - ANSWER-A

When top-down control occurs within an intertidal zone along the rocky coastline of the Pacific Ocean, which of the following species controls the abundance of other species?

• kelp
• mussels
• barnacles
• starfish - ANSWER-D

Plant community structure along an environmental gradient can often be explained by

• differences among species in their competitive abilities.
• differences among species in their abilities to tolerate stress.
• differences among species in their resistance to herbivores.
• a trade-off among species with respect to competitive ability

and stress tolerance - ANSWER-D

Environmental heterogeneity tends to be positively correlated with species diversity. - ANSWER-TRUE 2 / 4

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A food web is more complicated than a food chain - ANSWER- TRUE

The characteristics of a community are generally not dependent on the spatial scale at which the community is examined because communities are tightly integrated groups of species - ANSWER-FALSE

Which of the following groups of species represents a guild?

• species of birds that feed on nectar
• species of plants that use the C3 pathway of photosynthesis
• species of plants that tolerate shade
• species of plants or animals that are iteroparous - ANSWER-

A

In a forest community, the layer in which most photosynthesis occurs is the

• canopy
• midstory
• understory 3 / 4

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• 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

• canopy
• understory
• herb layer.
• forest floor - ANSWER-D

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

• epilimnion.
• metalimnion
• hypolimnion
• benthic zone - ANSWER-B

Zonation within a community is typically the result of differences in the

• patterns of predation among species within a community.
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