Question 1

Which of the following best describes the concept of 'character displacement' in ecological communities?

Accepted Answer

It is the evolutionary change that occurs in species due to competition, resulting in differences in traits where species overlap.

Question 2

In the context of competition, what does the 'competitive exclusion principle' state?

Accepted Answer

No two species can occupy the exact same niche in the same environment for a long time.

Question 3

Which equation best represents the concept of asymmetric competition between two species, where one species is a stronger competitor?

Accepted Answer

$$N_1(t+1$$) = $$N_1(t$$) + $$r_1$$ $$N_1(t$$) \left(1 - \frac{$$N_1(t$$) + \alpha $$N_2(t$$)}{$$K_1$$}\right)$$

Question 4

A population of birds is observed to have a shift in beak size when a competing species is present. What ecological phenomenon does this illustrate?

Accepted Answer

Character displacement

Question 5

Which of the following is an example of Batesian mimicry?

Accepted Answer

A harmless butterfly species resembling a toxic butterfly species to avoid predation.

Question 6

What is the main difference between fundamental and realized niche?

Accepted Answer

Fundamental niche is the theoretical range of environmental conditions a species could inhabit, while realized niche is the actual range occupied due to competition.

Question 7

Which of the following best describes mutualism?

Accepted Answer

An interaction where both species benefit.

Question 8

In a community, what role do 'keystone species' play?

Accepted Answer

They have a disproportionately large effect on community structure relative to their abundance.

Question 9

Which of the following is an example of parasitism?

Accepted Answer

A tapeworm living in the intestine of a mammal, absorbing nutrients.

Question 10

Which of the following equations best represents logistic population growth, which is often affected by competition?

Accepted Answer

$$\frac{dN}{dt} = rN \left(1 - \frac{N}{K}\right)$$

Question 11

Which of the following is NOT a type of competition described in ecological communities?

Accepted Answer

Mutualistic competition

Question 12

A parasite manipulates the behavior of its host to increase transmission to new hosts. This phenomenon is best described as:

Accepted Answer

Parasite ingenuity

Question 13

Which of the following is an example of Müllerian mimicry?

Accepted Answer

Two toxic butterfly species resembling each other.

Question 14

Which of the following best describes the effect of top-down control in a community?

Accepted Answer

Predators control the abundance of prey populations, which in turn affects lower trophic levels.

Question 15

Which of the following is a real-world example of brood parasitism?

Accepted Answer

A cuckoo bird laying its eggs in the nest of another bird species, leaving the host to raise its young.

Question 16

Which of the following is a defensive adaptation that reduces predation risk by making prey difficult to detect?

Accepted Answer

Cryptic coloration

Question 17

Which of the following statements about community structure is correct?

Accepted Answer

Community structure is influenced by species interactions, abundance, and diversity.

Question 18

Which of the following is an example of convergent evolution in mutualism?

Accepted Answer

Unrelated species developing similar mutualistic relationships with pollinators.

Question 19

Which of the following best describes the relationship between niche overlap and competition intensity?

Accepted Answer

As niche overlap increases, competition intensity increases.

Community Ecology: Species Interactions and Community Structure

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