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PCB 3043 Chapter 14 Questions and Correct
Answers
A plant species has defenses that make it unpalatable to most
herbivores. A generalist herbivore eats a variety of other plants
and seldom eats this plant. A specialist herbivore eats only the
well-defended plant species.
How might the abundance of the well-defended plant be affected
differently by the generalist herbivore and by the specialist
herbivore?
-The specialist herbivore may increase the abundance of the well-
defended plant by chasing other herbivores away from the plants.
-The generalist herbivore may decrease the abundance of the well-
defended plant if it eats the plant's competitors.
-The generalist herbivore may increase the abundance of the well-
defended plant by choosing to eat other plant species.
-The specialist herbivore may decrease the abundance of the well-
defended plant by feeding exclusively on that species. Ans: -The
generalist herbivore may increase the abundance of the well-
defended plant by choosing to eat other plant species.
-The specialist herbivore may decrease the abundance of the well-
defended plant by feeding exclusively on that species.
Carl Huffaker conducted an experiment using oranges and two
species of mites, a prey species that eats the oranges and a
predator species that eats the prey species. This work
demonstrates that predator and prey populations can persist in
© 2025 All rights reserved
, 2 | Page
nature when _____________________________. Ans: Carl Huffaker
conducted an experiment using oranges and two species of mites,
a prey species that eats the oranges and a predator species that
eats the prey species. This work demonstrates that predator and
prey populations can persist in nature when PREY DISPERSE MORE
EASILY THAN PREDATORS.
Why does an invasive species often have harmful effects on native
species?
-Humans cannot correct the negative effects that an invasive
species has on the fitness of native species.
-Native species are less competitive with or have fewer defensive
adaptations against an invasive species.
-An invasive species only causes harmful effects on native species
when it is introduced unintentionally.
-An invasive species always reduces the population sizes of native
species through heavy predation. Ans: -Native species are less
competitive with or have fewer defensive adaptations against an
invasive species.
Why do people sometimes introduce coevolved predators of
invasive species as biological control agents in invaded ranges?
-A coevolved predator species is more likely to survive in the
climate of the invaded range than other potential biological
control agents.
-A coevolved predator species of an invasive prey species will not
prey on or otherwise affect native species in the introduced range.
© 2025 All rights reserved
PCB 3043 Chapter 14 Questions and Correct
Answers
A plant species has defenses that make it unpalatable to most
herbivores. A generalist herbivore eats a variety of other plants
and seldom eats this plant. A specialist herbivore eats only the
well-defended plant species.
How might the abundance of the well-defended plant be affected
differently by the generalist herbivore and by the specialist
herbivore?
-The specialist herbivore may increase the abundance of the well-
defended plant by chasing other herbivores away from the plants.
-The generalist herbivore may decrease the abundance of the well-
defended plant if it eats the plant's competitors.
-The generalist herbivore may increase the abundance of the well-
defended plant by choosing to eat other plant species.
-The specialist herbivore may decrease the abundance of the well-
defended plant by feeding exclusively on that species. Ans: -The
generalist herbivore may increase the abundance of the well-
defended plant by choosing to eat other plant species.
-The specialist herbivore may decrease the abundance of the well-
defended plant by feeding exclusively on that species.
Carl Huffaker conducted an experiment using oranges and two
species of mites, a prey species that eats the oranges and a
predator species that eats the prey species. This work
demonstrates that predator and prey populations can persist in
© 2025 All rights reserved
, 2 | Page
nature when _____________________________. Ans: Carl Huffaker
conducted an experiment using oranges and two species of mites,
a prey species that eats the oranges and a predator species that
eats the prey species. This work demonstrates that predator and
prey populations can persist in nature when PREY DISPERSE MORE
EASILY THAN PREDATORS.
Why does an invasive species often have harmful effects on native
species?
-Humans cannot correct the negative effects that an invasive
species has on the fitness of native species.
-Native species are less competitive with or have fewer defensive
adaptations against an invasive species.
-An invasive species only causes harmful effects on native species
when it is introduced unintentionally.
-An invasive species always reduces the population sizes of native
species through heavy predation. Ans: -Native species are less
competitive with or have fewer defensive adaptations against an
invasive species.
Why do people sometimes introduce coevolved predators of
invasive species as biological control agents in invaded ranges?
-A coevolved predator species is more likely to survive in the
climate of the invaded range than other potential biological
control agents.
-A coevolved predator species of an invasive prey species will not
prey on or otherwise affect native species in the introduced range.
© 2025 All rights reserved
