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Exam 15: Predation

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Question 31

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The sigmoidal relationship between prey density and per capita predation rate in a type III functional response can be explained by all of the following factors,except

A) prey access to refuge.
B) predator preference.
C) recognition of prey by predator.
D) predator density.

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Question 32

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Quantitative inhibitors

A) are produced in small quantities by a plant.
B) are toxic to herbivores.
C) reduce digestibility of plant material.
D) include cyanide and alkaloids.

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Question 33

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The ________ value theorem predicts the length of time an individual should stay in a resource patch before leaving and seeking another.

Acoustic mimicry by some nonvenomous snakes that rattle their tails like rattlesnakes is a form of Mullerian mimicry.

In a graph that plots prey population (Nprey) on the x-axis against the number of predator offspring produced per unit of time on the y-axis,the slope represents the

________ defenses are not permanently present but,rather,are brought about by the presence or action of predators.

Most grasses tolerate grazing and actually benefit from it.

In the Lotka-Volterra models of predator-prey interactions,prey density does not influence predator mortality.

A(n)________ is an organism that lives on or within another without killing the host.

Which of the following is a positive numerical response made by a predator in response to an increase in prey density?

________ mimicry occurs when a nontoxic species closely resembles a toxic species,both of which are avoided by predators.

In the basic Lotka-Volterra equations that describe predator-prey interactions,the growth rate of the prey population (dNprey / dt) is zero when the density of predators (Nprey) is equal to

One explanation for the shape of the type II functional response is that predators develop a search image for prey after they have encountered them.

The relationship between the per capita rate of consumption and the number of prey is known as the predator's ________ response.

Carnivores can have an indirect,positive effect on plants by reducing populations of herbivores.

Most predators are also ________ to other predatory species.

A shift in the phenotype of individual prey,induced by the presence and activity of predators,is termed ________.

Which animal does not employ protective armor for predator defense?

The cycle of change in the size of predator and prey populations in response of one to the other is known as ________.

Many plants use ________ defenses,such as hairy leaves,thorns,or spines to deter herbivory.