Unit 1 Lesson 2

In order to measure population density, what two factors are required?

• the birth and death rates

• carrying capacity and the area of the space

• area of the space and the number of individuals

• the perimeter of the area and the number of individuals

Which of these changes would most likely lead to exponential growth in a population?

• an increase in the predation on the population

• a decrease in the habitat size of the population

• an increase in the amount of food available to the population

• a decrease in the amount of water available to the population

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Refer to the illustration.

During which time period is the death rate higher than the birth rate?

• period A

• period B

• period C

• period D

A heard of Zebra's has more deaths than births and more emigration than immigration. What will most likely happen to the size of the herd long-term?

• It will increase.

• It will decrease.

• It will stay the same.

• It will increase and then decrease.

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As a population reaches its carrying capacity, resources become more scarce. Which of these would increase within the population?

• birthrate

• competition

• nesting sites

• food resources

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A scientist is using the mark-recapture technique on a population of American Alligators. She captures several individuals and marks them so they can be identified later. Then, after a period of time, she captures a second sample of the American Alligator population in the same location, and counts to see how many of them are tagged. For which purpose would the scientist most likely use this technique?

• to find out how far each alligator travels each day on average

• to find out how many offspring a single alligator can have in a year

• to determine the total number of individuals in the alligator population

• to determine the average size of an individual in the alligator population

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What is the carrying capacity of the Species 5 population?

• 2,500

• 2,000

• 1,500

• 1,000

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• .45 Bald Eagles/km

• 2.2 Bald Eagles/km

• 45 Bald Eagles/30 km

• 22 Bald Eagles/15 km

Which of these is an example of a density-independent limiting factor?

• a parasite

• a food shortage

• a natural disaster

• a decrease in prey

Are the change in moose numbers over time cause by a density dependent or independent factor?

• density dependent

• density independent

• neither of these

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