question

Which processes increase a population's size?
- Births and deaths.
- Deaths and immigration.
- Births and immigration.
- Deaths and emigration.

answer

births and immigration

question

True or false? Factors that determine the per capita rate of increase of a population include the age of breeding and the number of offspring produced each year.

answer

True

question

Which factor does not affect a habitat's carrying capacity?
- Number of nesting sites.
- Maximum number of individuals in a population.
- Availability of food.
- Intensity of predation.

answer

maximum number of individuals in a population

question

Which equation represents the logistic growth rate of a population?
Î”NÎ”t=rmaxN
Î”NÎ”t=rMmaxN{(Kâˆ’N)/K}
Î”NÎ”t=rN
r=bâˆ’d

answer

Î”NÎ”t=rMmaxN{(Kâˆ’N)/K}

question

Which of the following statements about density-independent growth is true?
- Density-independent growth is also known as exponential growth.
- Density-independent growth can continue indefinitely in nature.
- The per-capita rate of increase may exceed rmax during density-independent growth.
- A population that is experiencing density-independent growth levels off at the environment's carrying capacity.

answer

Density-independent growth is also known as exponential growth.

question

Under which of the following conditions would a population most likely experience exponential growth?
- Large number of individuals in the starting population.
- Environment with a low carrying capacity.
- Young populations with few individuals.
- Habitat with limited resources.

answer

Young populations with few individuals

question

Which of the following statements about a population experiencing logistic growth is true?
- If the K and N values are similar, the amount of available resources is high.
- If N is greater than K, the population will shrink.
- If N is less than K, the population will not grow.
- If the K and N values are far apart, the population will grow very slowly.

answer

If N is greater than K, the population will shrink.

question

Which of the following statements are true of logistic growth? Select all that apply.
- When the population reaches carrying capacity, it stops growing.
- As the population approaches carrying capacity, it grows more slowly.
- As the population approaches carrying capacity, it grows more rapidly.
- The population grows at a steady rate.

answer

- When the population reaches carrying capacity, it stops growing.
- As the population approaches carrying capacity, it grows more slowly.

question

Which of the following statements are true of a population at carrying capacity? Select all that apply.
- The rate at which resources are used is equal to the rate at which they are supplied.
- The population growth rate equals zero.
- The population continues to grow at a constant rate.
- The birth rate equals the death rate.

answer

- The rate at which resources are used is equal to the rate at which they are supplied.
- The population growth rate equals zero.
- The birth rate equals the death rate.

question

As a population approaches carrying capacity, environmental resistance __________.
- remains constant
- cannot be determined from the graph
- increases
- decreases

answer

increases

question

Which of the following factors does not contribute to environmental resistance?
- competition for space
- birth rate
- likelihood of contracting a disease from others in population
- competition for food

answer

birth rate

question

pulations adapt to changing environmental conditions through the process of:
- natural selection.
- genetic drift.
- gene flow.
- mutation.

answer

natural selection

question

A species of beetle lives in habitats from 1200 feet to 5400 feet above sea level. Males living at the lower elevations tend to be very large and aggressive at sexual maturity. Males found higher in the mountains tend to be much smaller and nonaggressive once mature. Males in each region produce about the same number of surviving offspring each generation. On average, do males from the lower elevation or higher elevation habitats have greater fitness?

answer

All males appear to have equal fitness.