Question 1

Which of the following best describes the concept of an ecological niche?

Accepted Answer

The role and position a species has in its environment, including all the resources it uses and how it acquires them.

Question 2

According to the Competitive Exclusion Principle, what is the likely outcome if two species occupy the exact same niche in the same habitat?

Accepted Answer

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

Question 3

Which of the following is an example of mutualism?

Accepted Answer

A bee pollinating a flower while collecting nectar.

Question 4

In the context of coevolution, which scenario best illustrates this process?

Accepted Answer

A cheetah evolving to run faster to catch gazelles, while gazelles evolve to run faster to escape cheetahs.

Question 5

Which of the following equations best represents the relationship between predator and prey populations over time?

Accepted Answer

$$\frac{dN_{prey}}{dt} = rN_{prey} - aN$$_{prey}$$N_{predator}$$

Question 6

Which of the following is NOT a likely result of resource partitioning among coexisting species?

Accepted Answer

Complete overlap of ecological niches.

Question 7

A tick attaches to a dog and feeds on its blood, causing irritation and sometimes disease. This is an example of:

Accepted Answer

Parasitism

Question 8

Which of the following best explains why invasive species often cause ecological problems in their new environments?

Accepted Answer

They often lack natural predators or competitors, allowing their populations to grow rapidly.

Question 9

Which of the following is an example of warning coloration (aposematism)?

Accepted Answer

A brightly colored poison dart frog.

Question 10

Which of the following scenarios best illustrates convergent evolution?

Accepted Answer

Two unrelated desert plants evolving thick, fleshy stems to store water.

Question 11

If two bird species live in the same tree but feed on insects from different parts of the tree, this is an example of:

Accepted Answer

Resource partitioning

Question 12

Which of the following is a direct consequence of predation in a community?

Accepted Answer

Evolution of defensive adaptations in prey.

Question 13

Which of the following best describes the relationship between the lynx and hare populations shown in the classic population cycle graph?

Accepted Answer

The hare population increases first, followed by an increase in the lynx population.

Question 14

Which of the following is NOT a likely adaptation resulting from coevolution between a predator and its prey?

Accepted Answer

Prey and predator evolving identical feeding habits.

Question 15

Which of the following best explains why competition is usually more intense among members of the same species?

Accepted Answer

They have identical ecological niches and resource requirements.

Question 16

A fungus living in the roots of a tree helps the tree absorb nutrients, while the tree provides the fungus with carbohydrates. This is an example of:

Accepted Answer

Mutualism

Question 17

Which of the following best describes the effect of invasive species on native communities?

Accepted Answer

They often disrupt ecological balance by outcompeting native species.

Question 18

Which of the following equations represents the exponential growth of a population in the absence of limiting factors?

Accepted Answer

$$N_t = N_0$ e$$^{rt}$$

Question 19

Which of the following is a real-world example of the competitive exclusion principle?

Accepted Answer

Two species of barnacles occupying different zones on a rocky shore.

Question 20

Which of the following best describes the relationship between a parasite and its host?

Accepted Answer

The parasite benefits while the host is harmed.

Community Interactions and Species Relationships in Ecology

Study Guide - Practice Questions