Question 1

Which of the following best describes a disturbance in an ecological community?

Accepted Answer

An abiotic event that kills or removes individuals, creating space for other organisms.

Question 2

A volcanic eruption that destroys all living organisms and removes the soil initiates which type of succession?

Accepted Answer

Primary succession

Question 3

Which of the following is a characteristic of pioneer species in succession?

Accepted Answer

They are tolerant of harsh conditions and reproduce rapidly.

Question 4

According to the Intermediate Disturbance Hypothesis, when is community diversity expected to be greatest?

Accepted Answer

At intermediate levels of disturbance

Question 5

Which model of succession suggests that early species make the environment less suitable for later species?

Accepted Answer

Inhibition

Question 6

A forest fire that kills most trees but leaves the soil intact is an example of:

Accepted Answer

Secondary succession

Question 7

Which of the following statements about climax communities is supported by modern ecological understanding?

Accepted Answer

Climax communities can change over time and are not always the most diverse.

Question 8

Which historical ecologist described plant communities as a 'superorganism' with a life cycle ending in a stable climax stage?

Accepted Answer

Frederic Clements

Question 9

What is the main difference between primary and secondary succession?

Accepted Answer

Primary succession starts with no living organisms or soil; secondary succession starts with both present.

Question 10

Which of the following best illustrates the concept of 'alternative stable states' in ecological succession?

Accepted Answer

Multiple stable communities can exist under similar environmental conditions.

Question 11

Which of the following is an example of the facilitation model of succession?

Accepted Answer

Early colonizers improve soil fertility, allowing later species to establish.

Question 12

Which of the following best describes the tolerance model of succession?

Accepted Answer

Later species are unaffected by early species and eventually dominate due to their longevity.

Question 13

A glacier retreats, exposing bare rock. Which sequence of events is most likely to occur?

Accepted Answer

Primary succession: lichens and mosses → grasses → shrubs → trees

Question 14

Which of the following is a real-world application of succession theory in ecosystem restoration?

Accepted Answer

Introducing a mix of pioneer, intermediate, and climax species to attract pollinators and seed dispersers

Question 15

Which equation best represents the relationship between species diversity (D) and disturbance frequency (F) according to the Intermediate Disturbance Hypothesis?

Accepted Answer

$$D = -aF^2$ + bF + c$$

Question 16

Which of the following scenarios best demonstrates hysteresis in ecological succession?

Accepted Answer

A grassland remains a grassland even after conditions return to those that previously supported forest.

Question 17

Which scientist emphasized the role of both organisms (including animals) and the environment in shaping succession?

Accepted Answer

Charles Elton

Question 18

Which of the following is NOT a plausible outcome of succession in a disturbed ecosystem?

Accepted Answer

Permanent loss of all biodiversity

Question 19

Which of the following best describes the 'space for time substitution' method in studying succession?

Accepted Answer

Comparing different sites at various successional stages to infer temporal changes

Question 20

Which of the following statements about r-selected and K-selected species is correct in the context of succession?

Accepted Answer

r-selected species are common in pioneer communities, while K-selected species dominate climax communities.

8.2 Ecological Succession: Disturbance, Community Change, and Restoration

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