10BD 4-1 Describing Populations

What is the definition of population density?

• The total number of individuals in a population.

• The number of individuals per unit area or volume.

• The rate at which a population increases.

• The maximum population size an environment can sustain.

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DOK Level 1: Recall

As resources in a population become less available, population growth ____

• becomes positive.

• enters a phase of exponential growth.

• increases slowly.

• reaches carrying capacity.

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which of the following best describes exponential growth in a population?

• A population grows at a constant rate over time.

• A population grows rapidly and then stabilizes.

• A population grows at an increasing rate over time.

• A population decreases due to limited resources.

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DOK Level 1: Recall

Identify a biotic limiting factor in an ecosystem.

• Temperature

• Water availability

• Predation

• Soil composition

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DOK Level 1: Recall

Calculate the population density if there are 200 deer in a 50 square kilometer area.

• 2 deer per square kilometer

• 4 deer per square kilometer

• 5 deer per square kilometer

• 10 deer per square kilometer

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DOK Level 2: Skill/Concept

Which of the following scenarios is an example of a limiting factor affecting population growth?

• A population of rabbits reproduces without any predators.

• A forest fire reduces the available habitat for a population of birds.

• A population of fish increases due to an abundance of food.

• A population of insects migrates to a new area.

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DOK Level 2: Skill/Concept

Which statement best describes the population growth graph shown?

• The population has access to unlimited resources.

• The population has an indefinite amount of resources available to them.

• The population number increased exponentially over a short period of time.

• The population reached the maximum number for area.

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Analyze the impact of introducing a new predator into an ecosystem on the prey population.

• The prey population will increase due to more food availability.

• The prey population will decrease due to increased predation.

• The prey population will remain stable as predators do not affect them.

• The prey population will migrate to a new area to avoid predators.

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DOK Level 3: Strategic Thinking

Discuss how carrying capacity is related to limiting factors in an ecosystem.

• Carrying capacity is determined solely by the number of predators.

• Carrying capacity is the maximum population size that can be supported indefinitely by the available resources.

• Carrying capacity is unrelated to limiting factors.

• Carrying capacity is the minimum population size needed for survival.

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DOK Level 3: Strategic Thinking

Evaluate the effects of human activities on the population density of a species in a given area.

• Human activities always increase population density.

• Human activities have no effect on population density.

• Human activities can either increase or decrease population density depending on the nature of the activity.

• Human activities only decrease population density.

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DOK Level 3: Strategic Thinking