Exam 27: Population Growth and Regulation

A species that is transferred to a new environment where it has little environmental resistance and experiences an explosive population growth is called a(n)_________species.

The growth rate of a population is the difference between the population size and the death rate.

A measure of the ability of a population to grow under ideal circumstances (maximum birth rate and minimum death rate) is its _________.

Logistic population growth is characteristic of a population that moves into a new habitat, experiences a rapid increase in number, and then stabilizes.

Density-dependent factors become less effective as the population size increases.

How does environmental resistance affect a population?

Based on the data in the table, this population has a(n) _________growth pattern.

What percentage of Earthʹs productive land is currently used by the human population for crops and livestock?

In a maple forest in the spring, the ground is often covered with young maple seedlings, which compete for light and nutrients. By fall, most of the seedlings have died, leaving only a few survivors. This is an example of_________ life history pattern.

As a developing country passes through the demographic transition, which of the following will occur?

Deforestation increases the productivity of land.

When parents, on average, have just the number of children required to replace themselves, the natural increase of their population is at replacement level fertility (RLF).

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

The prediction, during the early 1800s, that our human population would eventually reach a point where we cannot sustain ourselves has not occurred. Why?

Which of the following correctly describes the effect parasites have on their hostʹs population size and on the host itself?

An ecologist is studying the painted turtle population in a small pond. At the beginning of the year, there are 100 individuals. Over the course of a year, 40 turtles are born and 60 die. There is no migration. What is the birth rate per year for this population?

A forest fire is a density-independent population control factor.

In areas that have a stable population, the number of children born in a period of time is

A random population distribution

If most of the individuals of a species die when they are young, that species exhibits a(n) _________survivorship curve.