Question 1

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

Accepted Answer

A)  decrease in predator mortality rate
B)  increase in predator survival rate
C)  immigration of predators to an area of high prey density
D)  decrease in predator reproduction rate C

Question 2

Discuss the costs and benefits of each of the three hunting methods employed by predators.

Accepted Answer

The three main hunting methods employed by predators are ambush hunting, pursuit hunting, and stalking hunting. Each method has its own costs and benefits.

Ambush hunting involves predators lying in wait for their prey and then quickly pouncing on them. The benefit of this method is that it requires minimal energy expenditure and can be very effective if the predator is well-camouflaged and patient. However, the cost is that it may require a long wait for the prey to come within striking distance, and there is no guarantee of success.

Pursuit hunting involves predators chasing down their prey over a distance. The benefit of this method is that it can result in a high success rate if the predator is fast and has good endurance. However, the cost is that it requires a lot of energy and can be risky if the prey is also fast and agile.

Stalking hunting involves predators stealthily approaching their prey before launching a surprise attack. The benefit of this method is that it can result in a high success rate if the predator is able to get close enough without being detected. However, the cost is that it requires patience and skill, and there is a risk of the prey escaping if the predator is not careful.

In conclusion, each hunting method has its own costs and benefits, and predators may employ a combination of these methods depending on their species and the specific characteristics of their prey. Ultimately, the success of a hunt depends on a predator's ability to adapt its hunting strategy to the circumstances and to capitalize on its strengths while minimizing its weaknesses.

Question 3

Unlike a scavenger, a predator is a heterotroph.

Accepted Answer

A) True 
 B)False  False

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

The Red Queen hypothesis refers to

Accepted Answer

A)  Hardy-Weinberg evolution.
B)  coevolution.
C)  directional selection.
D)  predator-prey oscillation.

Question 6

________ is the consumption of one living organism by another.

Accepted Answer

The answer of ________ is the consumption of one living...

Question 7

Which of the following is NOT considered an evolved defence of prey against predators?

Accepted Answer

A)  cryptic colouration
B)  Batesian mimicry
C)  flashing colouration
D)  character displacement

Question 8

Which of the following is NOT a class of plant secondary compounds?

Accepted Answer

A)  terpenoids
B)  phenolics
C)  nitrogen-based compounds
D)  alkanes

Question 9

How can predator-prey interaction result in niche compression?

Accepted Answer

The answer of How can predator-prey interaction result in niche...

Question 10

Predators can influence prey only through lethal, rather than nonlethal, effects.

Accepted Answer

A) True 
 B)False

Question 11

As lynx populations increase, snowshoe hare populations ________ and browse vegetation populations ________.

Accepted Answer

The answer of As lynx populations increase, snowshoe hare populations...

Question 12

What is the significance of the marginal value theorem?

Accepted Answer

The answer of What is the significance of the marginal...

Question 13

Quantitative inhibitors may constitute up to 60% of the dry weight of a leaf.

Accepted Answer

A) True 
 B)False

Question 14

A parasitoid

Accepted Answer

A)  is a true predator.
B)  actively pursues its prey.
C)  attacks the host indirectly by laying its eggs in or on the prey's body.
D)  only preys on animals.

Question 15

The response of a predator's consumption rate to prey density is a key factor as to whether a predator can regulate a prey population.

Accepted Answer

A) True 
 B)False

Question 16

According to the marginal value theorem, the amount of time a predator spends foraging in a patch will vary with resource quality and the time required to extract the resource.

Accepted Answer

A) True 
 B)False

Question 17

The trade-off between conflicting demands faced by a predator is described by the ________ theory.

Accepted Answer

The answer of The trade-off between conflicting demands faced by...

Question 18

Use a graph to illustrate the differences among the three types of functional responses. Explain the importance of the time a predator spends searching and handling prey to the different functional response types. In which functional responses can predators regulate prey populations and how?

Accepted Answer

The answer of Use a graph to illustrate the differences...

Question 19

According to the optimal foraging theory, a predator will select prey 1 (P₁)over prey 2 (P₂)when

Accepted Answer

A)  E₁ 
B)  Th₁ 
C)  E₁/Th₁ 
D)  Npᵣₑᵧ₁ > Npᵣₑᵧ₂.

Question 20

The recognition of a particular species by a predator is called the ________ image.

Accepted Answer

The answer of The recognition of a particular species by...

Exam 14: Predation

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

Discuss the costs and benefits of each of the three hunting methods employed by predators.

Unlike a scavenger, a predator is a heterotroph.

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

The Red Queen hypothesis refers to

________ is the consumption of one living organism by another.

Which of the following is NOT considered an evolved defence of prey against predators?

Which of the following is NOT a class of plant secondary compounds?

How can predator-prey interaction result in niche compression?

Predators can influence prey only through lethal, rather than nonlethal, effects.

As lynx populations increase, snowshoe hare populations and browse vegetation populations .

What is the significance of the marginal value theorem?

Quantitative inhibitors may constitute up to 60% of the dry weight of a leaf.

A parasitoid

The response of a predator's consumption rate to prey density is a key factor as to whether a predator can regulate a prey population.

According to the marginal value theorem, the amount of time a predator spends foraging in a patch will vary with resource quality and the time required to extract the resource.

The trade-off between conflicting demands faced by a predator is described by the ________ theory.

Use a graph to illustrate the differences among the three types of functional responses. Explain the importance of the time a predator spends searching and handling prey to the different functional response types. In which functional responses can predators regulate prey populations and how?

According to the optimal foraging theory, a predator will select prey 1 (P₁) over prey 2 (P₂) when

The recognition of a particular species by a predator is called the ________ image.