LEAP Review Unit 1 Concepts

Which term describes the maximum number of individuals of a species that an environment can support over time?

• Biodiversity

• Carrying capacity

• Limiting factor

• Population density

Which factor is most likely to decrease biodiversity in an ecosystem?

• Introduction of invasive species

• Increased rainfall

• Stable climate

• High genetic variation

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NGSS.MS-LS2-5

Which of the following best describes a stable ecosystem?

• One where the number and types of organisms remain relatively constant over time

• One where all organisms are the same species

• One with frequent, drastic changes in population sizes

• One with no interactions between species

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NGSS.MS-LS2-3

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Which human activity is most likely to reduce biodiversity in a forest ecosystem?

• Planting native trees

• Deforestation for agriculture

• Creating wildlife corridors

• Enforcing hunting regulations

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NGSS.MS-ESS3-4

NGSS.MS-LS2-5

A population of rabbits in a meadow increases rapidly until it reaches a plateau. Which factor most likely caused the population to stop increasing?

• Unlimited food supply

• Carrying capacity of the meadow

• Absence of predators

• Increased birth rate

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NGSS.MS-LS2-1

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A scientist observes that the population of fish in a lake decreases after a new species is introduced. Which factor is most likely affecting the fish population?

• Increased competition for resources

• Higher water temperature

• More sunlight

• Decreased oxygen levels

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If a population of deer exceeds the carrying capacity of its environment, what is the most likely outcome?

• The population will continue to grow indefinitely

• The population will decrease due to limited resources

• The population will remain stable

• The population will become extinct immediately

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

A researcher collects data showing that after a drought, the number of different species in a grassland decreases. What does this evidence suggest about the effect of changing conditions on biodiversity?

• Changing conditions can reduce biodiversity

• Changing conditions always increase biodiversity

• Biodiversity is unaffected by environmental changes

• Droughts have no impact on ecosystems

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NGSS.MS-LS2-1

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A student is given data on the population sizes of three species in a pond over five years. How could the student use this data to evaluate the stability of the pond ecosystem?

• By analyzing trends to see if populations remain relatively constant

• By measuring the temperature of the pond

• By counting the number of fish only

• By observing the color of the water

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NGSS.MS-LS2-1

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A city wants to reduce the negative impact of road construction on local wildlife. Which of the following is the best solution?

• Build wildlife corridors over or under roads

• Increase the number of roads

• Remove all vegetation near roads

• Allow unrestricted hunting

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NGSS.MS-LS2-4

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