BIO 320 FINAL EXAM NEWEST 2025 ACTUAL EXAM

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BIO 320 FINAL EXAM NEWEST 2025 ACTUAL EXAM

COMPLETE 200 QUESTIONS AND CORRECT

DETAILED ANSWERS (VERIFIED ANSWERS)

|ALREADY GRADED A+

As the degree of environmental heterogeneity of a community increases, the number of plant and animal species tends to

• decrease
• remain the same
• increase
• increase initially and then decrease - ANSWER-C

As the fertility of soil on the forest floor increases, the

• growth rate of plants increases
• size of plants decreases
• density of plants decreases
• number of species of plants increases - ANSWER-A
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In a food web, community complexity may be measured by the average number of feeding links per species, also referred to as

• trophic diversity
• food web diversity
• linkage density
• interconnectedness - ANSWER-C

Which of the following is true about the Shannon Index metric of diversity?

• it reflects both species richness and evenness
• it provides a metric of across ecosystem diversity
• it is used for systems which are not dominated by a top

predator

• it is used when there is a keystone species - ANSWER-A

• keystone species have an impact on a community
• in proportion to their numbers
• only when they are a top predator
• when they form the base of the food chain
• none of the above - ANSWER-D 2 / 4

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Top predators

• are always carnivores
• have no predator
• have a single predator
• are always a keystone species - ANSWER-B

In Robert Paine's experiment on the intertidal zone of the Pacific Northwest, the removal of the starfish demonstrated

• the influence of dessication
• coevolution between snails and mussels
• ther presence of apparent competition
• none of the above - ANSWER-C

Changes in community composition and structure over time are called

• succession.
• stratification.
• zonation.
• characterization - ANSWER-A 3 / 4

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An example of secondary succession is

• grasses colonizing sand dunes.
• lichens colonizing a rock.
• weeds colonizing a volcanic lava flow.
• crabgrass colonizing an abandoned wheat field. - ANSWER-

D

The inhibition model of succession proposes that

• early successional species modify the environment so that it

becomes more suitable for later successional species.

• the first species to arrive make the site less suitable for later

arriving species.

• later successional species are neither inhibited nor aided by

species of earlier stages.

• competition does not occur between early successional and

late successional species. - ANSWER-B

In succession, which type of environmental change occurs when the physical

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