Exam 26: Population Growth and Regulation

Interspecific competition is a density-independent factor. True or False?

-According to the graph, how long does it take the population of organisms represented by the middle line to reach 1,000 bacteria?

In countries where the number of children younger than 15 is approximately equal to the number between ages 15 and 45, the population is:

Predation is considered to be a density-________ factor that controls the size of the prey population.

Parasites affect their hosts' population sizes in a:

When mosquitoes are abundant, purple martins flock to the area and feed exclusively on them. When mosquito populations are not large, purple martins are similarly scarce and feed on other insects. This is an example of:

At present, Earth's human population is:

Which population represented on the graph has the highest biotic potential?

In the eighteenth and nineteenth centuries, people increased Earth's capacity to support more humans through ________ advances.

A measure of the ability of a population to grow under ideal circumstances is its ________.

An effective parasite is one that kills its host quickly. True or False?

In the United States today, there is a trend toward women having their first child in their late 30s or early 40s. In contrast, a few decades ago, most women started having children in their early 20s. What effect would you expect this change to have on population growth in the United States? Would it have any effect if the number of children per woman remains the same? Explain.

In a stable population with neither immigration nor emigration, the replacement-level fertility is one child per woman. True or False?

A population grows exponentially when:

A small country begins to experience stable economic prosperity after centuries of extreme poverty. The government uses the taxes generated for educating all members of the population and creating a comprehensive health care system for all its citizens. A social security system is established to support elderly members of the population. What demographic changes would you expect to see?

The United States has the lowest replacement-level fertility of the developed countries. True or False?

Exponential growth occurs:

If adults of reproductive age are having just enough children to replace themselves, then the population is said to have ________ fertility.

________ factors become more effective at limiting population growth as the size of the population increases.

Human populations have continued to grow because humans have increased Earth's ________ through agriculture, medicine, and technology.