Biology I-1: Chapter 5 Test

About 500 years ago, the world's population started

• decreasing.

• growing more rapidly.

• to reach carrying capacity.

• to level off.

Which of the following could describe a population that is decreasing in size?

• The birthrate and the death rate remain the same.

• The death rate is becoming lower than the birthrate.

• The death rate is becoming higher than the birthrate?

• The death rate is constant and the birthrate is increasing.

In a logistic growth curve, exponential growth is the phase in which the population

• grows quickly.

• reaches carrying capacity.

• growth begins to slow down.

• growth stops.

If a population grows larger than the carrying capacity of the environment, which of these is most likely to happen?

• The death rate may rise.

• The birthrate may rise.

• The death rate must fall.

• The birthrate must fall.

Demographic transition is change from high birthrates and high death rates to

• low birthrates and low death rates.

• exponential growth.

• low birthrates and high death rates.

• indefinite growth.

Suppose that a species of toad is introduced into a new environment in an attempt to reduce the population of insects. The toad has no natural predators in the new environment. The toad population would most likely

• increase logistically.

• decrease rapidly and die out.

• increase exponentially.

• remain the same.

Sea otters live in the ocean. Which of the following is NOT likely to be a limiting factor on the sea otter population?

• predation

• drought

• disease

• competition

Which of the following gives you information about a population's age structure?

• There are 10 males and 15 females under the age of two.

• There are 25 individuals within a square kilometer.

• All individuals are found at least 10 meters away from others.

• Individuals live in rain forests in tropical South America.

Which factor might contribute to an exponential growth rate in a given population?

• less competition

• reduced resources

• higher death rates

• lower birthrates

The movement of organisms into a range is called

• immigration.

• emigration.

• population shift.

• carrying capacity.