Question 1

Why is weather considered to be a density-independent factor?

Accepted Answer

The answer of Why is weather considered to be a...

Question 2

Deer mice have a high biotic potential.Therefore,they have a ______________.

Accepted Answer

Deer mice have a high biotic potential, which means they can reproduce rapidly and have many offspring. Therefore, they have a high birth rate. However, they also have a relatively low death rate compared to other animals, as they are not major predators and have few natural predators themselves. So, the best choice is (B) high birth rate and low death rate.

Question 3

Several decades ago,around 24 rabbits were introduced into the wild of Australia,a country with no native rabbit population,mild winters,and large rabbit-friendly food supplies.Where do you think the rabbit population is today,and was it a big deal that only 24 rabbits were released?

Accepted Answer

The answer of Several decades ago,around 24 rabbits were introduced...

Question 4

Which of the following is a density-independent factor?

Accepted Answer

Density-independent factors are environmental factors that affect population size regardless of the population's density, such as natural disasters (fire, avalanche, tornado). Therefore, choice D is the only correct option.

Question 5

A predator is an example of a(n)_____________.

Accepted Answer

A predator is a density-dependent factor because its impact on the population of its prey is directly related to the density of the prey population. As the prey population increases, the predator population also tends to increase, leading to a decrease in the prey population, which in turn leads to a decrease in the predator population. This results in a cyclical relationship between the predator and prey populations that is dependent on the density of the prey population.

Question 6

The term that describes a population growing at its biotic potential is ________________.

Accepted Answer

Exponential growth is the term used to describe population growth at its biotic potential, which is when the birth rate exceeds the death rate and there are unlimited resources to support the population. This type of growth is characterized by a J-shaped curve.

Question 7

_______________population growth produces an S curve when plotted over time.

Accepted Answer

Exponential population growth produces a J-shaped curve when plotted over time, while logistic population growth produces an S-shaped curve due to the limiting factors such as resources, competition, and predation that restrict population growth. Biotic population refers to the living organisms in a particular region, potential population refers to the maximum number of individuals that can be supported in a particular environment, and resistance refers to the ability of a population to withstand environmental stress.

Question 8

Which of the following influences population size?

Accepted Answer

All of the given answer choices can influence population size. Access to food and sufficient habitat can increase population size, while the presence of predators and pathogens can decrease population size. Therefore, all of these choices are correct.

Question 9

Early in the colonization of a new habitat,a population will show _____________,shifting to _____________ as the density of the population increases.

Accepted Answer

Early in colonization, populations often grow rapidly in an exponential manner due to abundant resources and less competition. As the population increases, resources become limited, leading to a shift towards logistic growth, where the population growth rate slows and stabilizes near the carrying capacity of the environment.

Question 10

Which of the following is true of r-selected species?

Accepted Answer

r-selected species have characteristics that allow them to thrive in unpredictable or seasonally changing environments. They have a short life span, reproduce quickly, and produce many offspring with little to no parental care. These traits allow them to adapt to changing conditions and rapidly colonize new habitats.

Question 11

What would happen to a large moose population if wolves were removed from the ecosystem? Explain your answer in terms of density-dependent or density-independent factors.

Accepted Answer

The answer of What would happen to a large moose...

Question 12

The biotic potential (r)of a population occurs when _____________.

Accepted Answer

Biotic potential refers to the maximum rate at which a population can grow in ideal conditions, with no environmental limits to survival or reproduction. Therefore, option C is the most accurate choice. Options A and D are incorrect, as having a birth rate of 100 or a death rate of 0 does not necessarily mean that the population is growing at its maximum potential.

Question 13

Which of the following factors affecting the human population is not density dependent?

Accepted Answer

Forest fires are not affected by the density of the human population.

Question 14

What are some biological characteristics of a species that determines its life-history strategy?

Accepted Answer

Life-history strategies are shaped by natural selection and influenced by various factors, including biological characteristics of a species such as its maturity rate, life span, and level of fecundity. These factors play a significant role in determining how organisms allocate their resources towards growth, reproduction, and survival, which in turn affects their life-history traits such as age at first reproduction, reproductive output, and lifespan. Therefore, the best choice is D, maturity rate, life span, and level of fecundity.

Question 15

Lions in a savanna will increase in population as the total population of their prey species in the ecosystem increases.The number of lions present in the ecosystem is _____________.

Accepted Answer

The number of lions present in the ecosystem is a density-dependent factor, meaning it is influenced by the density of their prey species. As the population of prey species increases, there will be more food available for the lions, allowing them to reproduce and increase in numbers. If the prey population decreases, the lion population will also decrease due to food scarcity.

Question 16

Which of the following is NOT a characteristic of r-selected species?

Accepted Answer

r-selected species are characterized by their short life, early maturity, rapid growth, and production of many small offspring. They are also typically niche generalists, able to adapt to various environments. Therefore, long life (option A) is not a characteristic of r-selected species.

Question 17

Why is it ultimately better for a population to have some resistance factors (that is,factors that reduce a population's size)?

Accepted Answer

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Question 18

A farm field becomes abandoned and milkweed plants grow up in numbers over time.Based on the shape of the graph below,what kind of growth is this population experiencing? Where is the population in its growth,and what does this mean?

Accepted Answer

The answer of A farm field becomes abandoned and milkweed...

Question 19

Bighorn sheep were introduced to an island in the Gulf of California in 2010.Originally,75 bighorns were introduced.When a census was taken in 2011,there were 100 bighorns found.What is the growth rate of the bighorns on the island?

Accepted Answer

The growth rate is calculated as ((100 - 75) / 75) * 100% = 33%.

Question 20

A good example of a K-selected species would be _______________.

Accepted Answer

K-selected species are those that have a low reproductive rate, long lifespans, and high parental investment in offspring. Wolves fit this description because they typically only produce a few offspring per year, have a relatively long lifespan, and invest a lot of time and energy into caring for their young. They also have a relatively stable population size and are well-adapted to their environment, which are additional traits of K-selected species.

Quiz 5: Population Ecology Gray Wolves Return to Yellowstone