Analyzing Populations (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

• the perimeter of the area and the number of individuals

• area of the space and the number of individuals

Which factor is most likely to change the carrying capacity of an area?

• a disease that affects one species

• a stable amount of resources

• emigration of a population

• a fire or a flood

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NGSS.MS-LS2-4

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

• a parasite

• a food shortage

• a natural disaster

• a decrease in prey

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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NGSS.MS-LS2-4

A herd of caribou has more births than deaths and more immigration than emigration. What will most likely happen to the size of the herd?

• It will increase.

• It will decrease.

• It will stay the same.

• It will decrease and then stabilize.

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

A scientist is using the mark-recapture technique on a population of snakes. 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 snake 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 snake travels each day on average

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

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

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

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NGSS.HS-LS2-2

Bobcats are generally solitary and establish territories of a certain size where they hunt for food. What type of population dispersion would you expect bobcats to have?

• random dispersion

• uniform dispersion

• clumped dispersion

• competitive dispersion

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

• birthrate

• competition

• nesting sites

• available shelter

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

If a population has no known predators and plenty of available resources, how might that population change?

• It would increase.

• It would decrease.

• It would spread out.

• It would remain the same.

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

During which time period are the birthrate and death rate equal?

• period A

• period B

• period C

• period D