Changes in Population

Which statement BEST describes how limiting factors affect the organisms in an ecosystem?

• They destroy resources organisms need to survive.

• They provide what an organism needs to survive.

• They keep a population from getting too large.

• They have no effect on the organisms in an ecosystem.

The amount of deaths that occur within a certain time frame represents the __________.

• immigration

• birth rate

• emigration

• death rate

Which of the following is the amount of organisms in a given amount of space?

• Carrying capacity

• Limiting factor

• Emigration

• Population density

A disease kills most members of a predator population. What is the MOST LIKELY effect on the prey population?

• It will also be killed by the disease.

• It will decrease in size.

• It will greatly increase in size.

• It will not be affected by the change in the predator population.

Which of the following will help a population increase?

• limiting factors

• pollution

• poaching

• immigration

If the death rate is greater than the birth rate, the population will _____________.

• decrease

• increase

• stay the same

• go extinct

The amount of births that occur within a certain time frame represents the __________.

• immigration

• birth rate

• emigration

• death rate

What occurs when organisms leave a population to join another one?

• immigration

• death

• birth rate

• emigration

If animals cannot find enough places to build nests, which of the following could be a limiting factor?

• food

• space

• water

• disease

If an area has all the wolves that it can support, the wolf population has reached its _____________.

• carrying capacity

• population density

• immigration

• death rate