AnswersPA Human Anatomy Physiology A 2026-2027 SMITH ICScientific Inquiry

Succession Answers

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How is a climax community different than a primitive community?

A
The types of organisms present in a climax community are more complex.
B
Primitive communities tend to have less biodiversity than climax communities.
C
Climax communities are more stable than primitive communities.
D
All of the above
2
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Succession is affected by _______.

A
climate
B
soil
C
geography
D
all of the above
3

Succession is always caused by natural events.

A
T
B
F
4

How are primary and secondary succession similar?

A
Both primary and secondary succession involve ecosystems that have no soil.
B
Both primary and secondary succession involve ecosystems recovering from a disruptive event.
C
Both types of succession require a pioneer species to aid recovery of ecosystems.
D
Primary and secondary succession have no similarities.
5

Succession performs a variety of functions within ecosystems. What is the main reason that succession is important in maintaining ecosystems?

A
Succession allows the earth to change.
B
Succession ultimately leads to climax communities, which are stable and sustainable.
C
Succession keeps pollution from harming ecosystems.
D
Succession allows simple organisms to play a larger role in ecosystems than normal.
6

Human impact on ecosystems would most likely lead to secondary succession over primary succession.

A
T
B
F
7

Which of the following is the most likely cause of succession in ecosystems?

A
arrival of new species
B
rain
C
loss of an animal species
D
wildfires
8

Succession is a process, with each new community paving the way for the next.

A
T
B
F
9

Which of the following is not a characteristic of a climax community?

A
high levels of biodiversity
B
presence of complex organisms
C
conditions suitable for all organisms
D
experiences no change
10

Which of the following about secondary succession is not true?

A
It occurs in ecosystems without soil.
B
It occurs in ecosystems that are already established.
C
It reduces the number of species in an ecosystem.
D
It is initiated by a disruptive event.
11

Which of the following could be both a natural and a human cause of succession?

A
lava flow
B
overcutting
C
fire
D
wind
12

Which of the following would most likely be a cause of primary succession?

A
farming
B
overhunting
C
volcano
D
defoliation
13

Which of the following is an example of a pioneer species?

A
fungus
B
trees
C
shrubs
D
grass
14

Secondary succession can happen after primary succession or independently of primary succession.

A
T
B
F
15

Different types of changes take place in ecosystems after they experience a disturbance. From June to September 1988, 51 different wildfires started in Yellowstone Park. By the end of the summer, approximately 794,000 acres of the park were affected, including about 24 percent of the whitebark pine forest population, many lodgepole pine stands, and a variety of other plants and animals. Photo by National Park Service Which type of change was seen in the ecosystems affected by the 1988 fires in Yellowstone Park?

Question illustration
A
primary succession
B
secondary succession
C
a climax community
D
species extinction
16

What is likely to happen to the ecosystem pictured below after a period of time?

Question illustration
A
The ecosystem will undergo only primary succession.
B
The ecosystem will undergo only secondary succession.
C
The ecosystem will undergo primary succession followed by secondary succession.
D
The ecosystem will never recover.

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