Question 1

Which of the following best describes mutualism in biological communities?

Accepted Answer

A relationship where both species benefit from the interaction.

Question 2

In the context of species interactions, what does the notation (+/-) represent?

Accepted Answer

One species benefits while the other is harmed.

Question 3

Which defense mechanism is always present in plants, regardless of herbivore attack?

Accepted Answer

Constitutive defense

Question 4

A harmless species mimics the appearance of a poisonous species. This is an example of:

Accepted Answer

Batesian mimicry

Question 5

Which of the following is a chemical defense used by plants against herbivores?

Accepted Answer

Nicotine

Question 6

What is the Competitive Exclusion Principle?

Accepted Answer

Two species competing for the same resources cannot coexist.

Question 7

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 8

Aposematic coloration is an adaptation that:

Accepted Answer

Warns predators of toxins or venom present in the animal.

Question 9

Which of the following is an example of amensalism?

Accepted Answer

Algae blocking sunlight for other plants, but algae are unaffected.

Question 10

What is the main difference between fundamental and realized niches?

Accepted Answer

Fundamental niche is the potential area a species could occupy, while realized niche is the area actually occupied due to competition.

Question 11

Which equation best represents the effect of predation on prey population growth?

Accepted Answer

$$N_{t+1} = N_t + rN_t - cN_tP_t$$

Question 12

Which of the following is a characteristic of keystone species?

Accepted Answer

Their removal has a disproportionately large effect on community structure.

Question 13

Which of the following best describes ecological succession?

Accepted Answer

The orderly pattern of species replacements until a climax community is reached.

Question 14

Which of the following is true about trophic webs?

Accepted Answer

They consist of all the food chains in a community and show complex feeding relationships.

Question 15

Character displacement is most likely to occur when:

Accepted Answer

Two species compete for similar resources in the same area.

Question 16

Which of the following is an example of an inducible defense in plants?

Accepted Answer

Production of alkaloids only after herbivore attack.

Question 17

Which of the following best describes commensalism?

Accepted Answer

One species benefits while the other is unaffected.

Question 18

Which of the following is NOT a way parasites can manipulate their hosts?

Accepted Answer

Causing host to produce toxins to deter predators.

Question 19

Which of the following is most likely to increase species diversity in a community?

Accepted Answer

Resource partitioning among species.

Question 20

Which of the following is true about primary succession?

Accepted Answer

It begins on bare rock or newly exposed surfaces.

Biological Communities and Species Interactions

Study Guide - Practice Questions