Question 1

Which of the following would likely result from a decrease in the density of the golden apple snail in an area that previously had large snail populations?

Accepted Answer

A decrease in the density of the golden apple snail, which feeds on aquatic plants, would likely lead to an increase in the biomass of aquatic plants due to reduced grazing pressure.

Question 2

In Krebs and colleagues' study of snowshoe hare cycles, which of the following was a plausible reason for the failure of the "+Food/‒Predator" treatment to stop hare population declines late in the cycle?

Accepted Answer

The "+Food/‒Predator" treatment failed because only some predators were excluded, allowing others to still impact the hare population.

Question 3

Refer to the figure. What year was the +Food/-Predators hare density 400/km²and decreasing?

Accepted Answer

The answer of Refer to the figure.
 What year was...

Question 4

When animals are exposed to chronic stress, the stress response suppresses all of the following except

Accepted Answer

Chronic stress typically suppresses growth, reproduction, and the immune response, but it does not suppress the release of glucose; instead, it often increases glucose release to provide energy for the stress response.

Question 5

The hormone _______ stimulates the release of stored glucose to make it available to muscles.

Accepted Answer

Cortisol is a hormone that helps increase blood glucose levels by stimulating gluconeogenesis and glycogenolysis, making glucose available to muscles.

Question 6

Refer to the figure.
  You are studying the composition of the diet of a predator species. Among other prey, this predator preys upon species A. You collect data on how species A's abundance is related to the percent of the predator's diet composed of this species. Based on the figure, at which point would predator consumption patterns match the predicted consumption patterns if the predator's percent of consumption matched the percent of species A in terms of total prey base?

Accepted Answer

The answer of Refer to the figure.
  You are...

Question 7

Refer to the figure.
  You are studying the composition of the diet of a predator species. Among other prey, this predator preys upon species A. You collect data on how species A's abundance is related to the percent of the predator's diet composed of this species. Based on the figure, at what percent of species A is the predator's diet comprised of 50% species A and 50% other prey?

Accepted Answer

The answer of Refer to the figure.
  You are...

Question 8

The popular rhyme to distinguish the scarlet king snake (Lampropeltis elapsoides) from the venomous eastern coral snake (Micrurus fulvius) goes "red touching black - pat it on the back; red touching yellow - kills a fellow". Explain the type(s) of defense the scarlet king snake exhibits and an energetic advantage of this type of defense to the scarlet king snake.

Accepted Answer

The answer of The popular rhyme to distinguish the scarlet...

Question 9

Military camouflage is analogous to what type of biological defense against predation? Explain how camouflage works as a defense.

Accepted Answer

The answer of Military camouflage is analogous to what type...

Question 10

Department of Natural Resource managers, biologists, and foresters in many states work together to successfully manage game populations by determining the number of deer, bear or other animals that can be harvested each year. Harvest numbers can fluctuate based on climatic factors and natural events that affect plant production. For example, squirrels have been documented to have additional litters in masting years. Additionally, in the years following oak tree mastings, the number deer and squirrels that can be harvested tends to increase. Explain why mastings can influence deer and squirrel populations and the benefit of them to the oak tree.

Accepted Answer

The answer of Department of Natural Resource managers, biologists, and...

Question 11

You are studying two species in a community: a carnivorous predator and a herbivorous prey species. When analyzing the data, you realize the population size of the predators is very similar to the population size of the prey. What makes this unusual?

Accepted Answer

The answer of You are studying two species in a...

Question 12

Use the following simple predator-prey relationships to answer the question (assume no other interactions exist in this system): Mice eat grain grown by a farmer before it can be harvested. The mice are consumed by several species of snakes, which themselves are consumed by hawks. If the population of snakes was suddenly wiped out by disease, explain the short-term effects on the grain, mice, and hawk populations, and why these effects would be observed.

Accepted Answer

The answer of Use the following simple predator-prey relationships to...

Question 13

Use the following simple predator-prey relationships to answer the question (assume no other interactions exist in this system): Mice eat grain grown by a farmer before it can be harvested. The mice are consumed by several species of snakes, which themselves are consumed by hawks. If the population of snakes were suddenly wiped out by disease, explain the long-term effects on the grain, mice, and hawk populations, and why these effects would be observed.

Accepted Answer

The answer of Use the following simple predator-prey relationships to...

Question 14

Use the following simple predator-prey relationships to answer the question (assume no other interactions exist in this system): Mice eat grain grown by a farmer before it can be harvested. The mice are consumed by several species of snakes, which themselves are consumed by hawks. Local farmers would like to use a biological, as opposed to a chemical, means to protect their crop. What would be the most effective way for farmers in this area to protect their grain crop naturally? Why?

Accepted Answer

The answer of Use the following simple predator-prey relationships to...

Question 15

Suppose you are studying the effect of predation on levels of cortisol in a species of mouse in the lab. You set up an experiment in which you house some mice in cages with photographs of rabbits on the walls of their cages; others are housed with photographs of flowers on the walls of their cages; while others are housed with photographs of hawks. The cortisol level in mice blood plasma (nmol/L) after exposure to the photographs measures 190 for rabbits, 475 for hawks, and 185 for flowers. Why did you expose the mice to three different types of photographs? What type of relationship would an individual mouse have with the different plant/animal species pictured? Why did the hawk photograph result in the highest levels of cortisol?

Accepted Answer

The answer of Suppose you are studying the effect of...

Question 16

How does predation and herbivory differ from parasitism and parasitoidism?

Accepted Answer

Parasites and parasitoids typically spend their entire lives on or in a single host, whereas predators and herbivores consume multiple individuals over their lifetimes.

Question 17

Refer to the figure.
 The graphs show different relationships between the proportion of prey that are tubificids and the proportion that are eaten by predators (guppies). Based on research by Murdoch et al., which graph best represents the foraging habits of guppies?

Accepted Answer

The answer of Refer to the figure.
 The graphs show...

Question 18

Which statement about predators and herbivores is true?

Accepted Answer

Predators often have a broad diet because they can consume various prey species, whereas herbivores are more likely to specialize in certain types of plants.

Question 19

Which statement about garter snakes and TTX is true?

Accepted Answer

Some garter snakes have evolved resistance to TTX, a potent neurotoxin, due to mutations in their sodium channels, allowing them to prey on toxic newts that produce TTX.

Question 20

Which statement about the effects of herbivory on tobacco is false?

Accepted Answer

Tobacco plants do produce induced defenses, which are secondary compounds that are synthesized in response to herbivore attack. These compounds can deter herbivores directly or indirectly.

Quiz 12: Predation

Which of the following would likely result from a decrease in the density of the golden apple snail in an area that previously had large snail populations?

In Krebs and colleagues' study of snowshoe hare cycles, which of the following was a plausible reason for the failure of the "+Food/‒Predator" treatment to stop hare population declines late in the cycle?

Refer to the figure. What year was the +Food/-Predators hare density 400/km²and decreasing?

When animals are exposed to chronic stress, the stress response suppresses all of the following except

The hormone _______ stimulates the release of stored glucose to make it available to muscles.

Military camouflage is analogous to what type of biological defense against predation? Explain how camouflage works as a defense.

You are studying two species in a community: a carnivorous predator and a herbivorous prey species. When analyzing the data, you realize the population size of the predators is very similar to the population size of the prey. What makes this unusual?

How does predation and herbivory differ from parasitism and parasitoidism?

Refer to the figure. The graphs show different relationships between the proportion of prey that are tubificids and the proportion that are eaten by predators (guppies) . Based on research by Murdoch et al., which graph best represents the foraging habits of guppies?

Which statement about predators and herbivores is true?

Which statement about garter snakes and TTX is true?

Which statement about the effects of herbivory on tobacco is false?

Quiz 12: Predation

Which of the following would likely result from a decrease in the density of the golden apple snail in an area that previously had large snail populations?

In Krebs and colleagues' study of snowshoe hare cycles, which of the following was a plausible reason for the failure of the "+Food/‒Predator" treatment to stop hare population declines late in the cycle?

Refer to the figure. What year was the +Food/-Predators hare density 400/km2 and decreasing?

When animals are exposed to chronic stress, the stress response suppresses all of the following except

The hormone _______ stimulates the release of stored glucose to make it available to muscles.

Military camouflage is analogous to what type of biological defense against predation? Explain how camouflage works as a defense.

You are studying two species in a community: a carnivorous predator and a herbivorous prey species. When analyzing the data, you realize the population size of the predators is very similar to the population size of the prey. What makes this unusual?

How does predation and herbivory differ from parasitism and parasitoidism?

Refer to the figure. The graphs show different relationships between the proportion of prey that are tubificids and the proportion that are eaten by predators (guppies) . Based on research by Murdoch et al., which graph best represents the foraging habits of guppies?

Which statement about predators and herbivores is true?

Which statement about garter snakes and TTX is true?

Which statement about the effects of herbivory on tobacco is false?

Refer to the figure. What year was the +Food/-Predators hare density 400/km²and decreasing?