Unit 1

Due to stress, large numbers of female lemmings miscarry their young and fail to reproduce.

• Density-Dependent

• Density-Independent

Many fish die due to a drastic change in water temperature.

• Density-Dependent

• Density-Independent

An extensive drought in the plains threatens wildebeest, giraffe, zebra, and springbok populations.

• Density-Dependent

• Density-Independent

Which of the following is a density-dependent limiting factor?

• human activities

• unusual weather

• competition

• natural disaster

Which of the following is a density-independent limiting factor?

• natural disaster
• predation
• disease
• parasitism

Which of the following would NOT be an example of a density dependent limiting factor?

• fire

• disease

• lack of food

• space

Which of the following would NOT be an example of a density independent factor?

• predation

• tornado

• hurricane

• fire

Which of the following are examples of a density independent factors?

• forest fire

• seasonal cycles

• storms

• disease

Which of the following are density dependent factors?

• competition for resources

• predation

• disease

• natural disasters

Excessive amounts of rain caused a flood in the southwest United States that resulted in substantial amounts of deaths in the rabbit population? This situation is an example of a density _____________ limiting factor.

• density-independent
• density-dependent
• density- too high
• density- too low