Chapter 5 Quiz

There are 150 Saguaro cacti plants per square kilometer in a certain area of Arizona desert. To which population characteristic does this information refer?

• geographic distribution

• age structure

• population density

What can cause a population to grow?

• The birthrate becomes higher than the death rate.

• The birthrate stays the same, and the death rate increases.

• The birthrate becomes lower than the death rate.

When individuals in a population reproduce at a constant rate, it produces a growth pattern called

• logistic growth.

• growth density.

• exponential growth.

Which are two ways a population can decrease in size?

• increased death rate and immigration

• decreased birthrate and emigration

• emigration and increased birthrate

As resources in a population become less available, population growth

• decreases rapidly

• increases slowly.

• reaches carrying capacity.

Which will reduce competition within a species’ population?

• fewer individuals

• higher birthrate

• fewer resources

Which would be least likely to be affected by a density-dependent limiting factor?

• a small, scattered population

• a large, dense population

• a population with a high immigration rate

Which density-dependent factors, other than the predator/prey relationship, affected the populations of moose and wolves on Isle Royale?

• parasitic wasps for the wolves and clear-cut forest for the moose

• a hurricane followed by drought for both moose and wolves

• food availability for the moose and disease for the wolf

About 500 years ago, the world’s population started

• to reach carrying capacity.

• growing more rapidly.

• to level off.

In Rwanda, there are more young children than teenagers, and more teenagers than adults. This age structure indicates a population that

• has stopped growing.

• will double in 30 years.

• has a steady growth rate.