Populations

Which of the following statements is correct?

• A population's density is the number of individuals that the population contains.

• A population's size is the number of individuals per unit area.

• A population's dispersion is the spatial pattern of individuals within the population.

• All of the above

Which of the following describes a clumped population distribution?

• individuals scattered randomly throughout their environment

• individuals bunched together in clusters

• individuals evenly spaced across an area

• individuals arranged in a radiating, spokelike pattern

 If the birth rate of a population is 0.060 and the death rate is 0.080, what is the growth rate for this population?

• 0.080

• 0.060

• 0.020

• -0.020

Which of the following would be considered a limiting resource for a population?

• Food

• Water

• Air

• All of the above

What is symbiosis?

• any type of relationship or association between two organisms

• an example of mutualism

• any type of competition between organisms

• a close, long-term association between two species

How does competition affect living communities?

• All organisms are in constant competition with each other, which makes resources increasingly scarce.

• Organisms that have overlapping niches may compete for resources if those resources are limited.

• Unless organisms share a need for certain common resources, intense competition between organisms will always exist.

• Competition is intense for the resources that are most abundant in an environment.

What is the difference between an animal's habitat and its niche?

• A habitat is the type of environment in which an organism lives. A niche is an animal's way of life within its habitat.

• Habitat is the general term for where an animal lives; niche is a more scientific term to describe where an animal lives.

• A niche is the type of environment in which an organism lives. A habitat is the way of life of that animal within its niche.

• The term habitat includes only the living parts of the environment. The term niche includes only the nonliving parts of the environment.

Which of the following has the greatest reproductive potential?

• a species that reproduces late in life and has few offspring

• a species that is already near its carrying capacity and produces many offspring

• a species that lives in a changing environment and produces many offspring

• a species that lives in a stable environment and has a long life span

Which of the following is most likely to have low reproductive potential?

• Mosquito

• Lion

• Cockaroach

• ragweed

Which of the following is a density-dependent factor that can slow population growth?

• food

• rainfall

• wildfire

• temperature