Question 1

Which of the following best defines a biological community in the ecological sense?

Accepted Answer

All populations of different species interacting within a particular area.

Question 2

Which interaction is characterized by one species benefiting while the other is harmed?

Accepted Answer

Parasitism

Question 3

According to the competitive exclusion principle, what is the likely outcome when two species compete for the exact same resources?

Accepted Answer

One species will outcompete and exclude the other from the habitat.

Question 4

Which equation correctly represents the Simpson's Diversity Index?

Accepted Answer

$ D = 1 - \sum \left( \frac{n_i}{N} \right)^2 $

Question 5

A community contains 3 species with the following numbers of individuals: Species A: 10, Species B: 20, Species C: 30. Calculate the Simpson's Diversity Index for this community using $ D = 1 - \sum \left( \frac{n_i}{N} \right)^2 $.

Accepted Answer

0.611

Question 6

Which of the following best describes resource partitioning?

Accepted Answer

Species evolve to use different resources or use resources in different ways to reduce competition.

Question 7

Which of the following is an example of mutualism?

Accepted Answer

Bees pollinating flowers while obtaining nectar.

Question 8

Which statement about keystone species is correct?

Accepted Answer

Keystone species exert strong control on community structure relative to their abundance.

Question 9

Disturbance in a community typically leads to which of the following outcomes?

Accepted Answer

Changes in species diversity and composition, often favoring opportunistic species.

Question 10

Which of the following best explains how biogeography affects community diversity?

Accepted Answer

Communities closer to the equator tend to have higher species diversity due to favorable climate and longer evolutionary history.

Question 11

Which of the following is NOT a type of interspecific interaction?

Accepted Answer

Photosynthesis

Question 12

Which scenario best illustrates the concept of competitive exclusion?

Accepted Answer

Two species of bacteria compete for the same sugar source, and one species eventually disappears.

Question 13

Which of the following is an example of commensalism?

Accepted Answer

A remora fish attaching to a shark and feeding on scraps without harming or benefiting the shark.

Question 14

Which of the following best describes the relationship between species richness and relative abundance in determining community diversity?

Accepted Answer

Both species richness and relative abundance contribute to overall community diversity.

Question 15

Which of the following is a plausible effect of a pathogen on community diversity?

Accepted Answer

Pathogens can reduce diversity by selectively affecting certain species.

Question 16

Which of the following best describes the difference between primary and secondary succession?

Accepted Answer

Primary succession begins on bare rock or soil with no previous life, while secondary succession occurs in areas where a disturbance has left the soil intact.

Question 17

Which of the following is a real-world example of a foundation species affecting community structure?

Accepted Answer

Coral reefs providing habitat for many marine species.

Question 18

Which of the following best explains why island communities often have lower species diversity than mainland communities?

Accepted Answer

Islands have fewer available niches and are more isolated, limiting immigration and increasing extinction rates.

Question 19

Which of the following is a plausible outcome of high species diversity in a community?

Accepted Answer

Increased stability and resilience to disturbances.

Question 20

Which of the following best describes the role of trophic structure in community organization?

Accepted Answer

Trophic structure refers to the feeding relationships among organisms, which influence energy flow and community dynamics.

Community Ecology: Interactions, Diversity, and Structure

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