Analyze Ecosystem Change Data - Middle School Life Science
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What does the term "limiting factor" mean in a population data set?
What does the term "limiting factor" mean in a population data set?
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A resource or condition that restricts population growth. Examples include food, water, space, or predators that control population size.
A resource or condition that restricts population growth. Examples include food, water, space, or predators that control population size.
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What is the definition of carrying capacity ($K$) in an ecosystem?
What is the definition of carrying capacity ($K$) in an ecosystem?
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The maximum population an environment can sustainably support. Determined by available resources and environmental conditions.
The maximum population an environment can sustainably support. Determined by available resources and environmental conditions.
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What is the difference between density-dependent and density-independent factors?
What is the difference between density-dependent and density-independent factors?
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Density-dependent varies with density; density-independent does not. Competition and disease are density-dependent; weather is density-independent.
Density-dependent varies with density; density-independent does not. Competition and disease are density-dependent; weather is density-independent.
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Which option is a density-independent population limiter: drought, disease, or competition?
Which option is a density-independent population limiter: drought, disease, or competition?
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Drought. Weather events affect populations regardless of their density.
Drought. Weather events affect populations regardless of their density.
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What is a trophic cascade in population data after a predator is removed?
What is a trophic cascade in population data after a predator is removed?
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A chain of population changes across multiple trophic levels. Removing top predators causes ripple effects through food webs.
A chain of population changes across multiple trophic levels. Removing top predators causes ripple effects through food webs.
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What does a population boom followed by a crash most strongly suggest about resources?
What does a population boom followed by a crash most strongly suggest about resources?
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Resources were exceeded, then scarcity caused a decline. Overshoot occurs when populations exceed carrying capacity temporarily.
Resources were exceeded, then scarcity caused a decline. Overshoot occurs when populations exceed carrying capacity temporarily.
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Which relationship is shown when two species both decrease as they use the same resource?
Which relationship is shown when two species both decrease as they use the same resource?
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Competition. Both species need the same limited resource to survive.
Competition. Both species need the same limited resource to survive.
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Which relationship is shown when predator numbers rise shortly after prey numbers rise?
Which relationship is shown when predator numbers rise shortly after prey numbers rise?
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Predator-prey relationship with a time lag. Predators need time to reproduce in response to prey abundance.
Predator-prey relationship with a time lag. Predators need time to reproduce in response to prey abundance.
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Identify the dependent variable when a graph shows rabbit population versus time.
Identify the dependent variable when a graph shows rabbit population versus time.
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Rabbit population. The dependent variable (y-axis) changes in response to time.
Rabbit population. The dependent variable (y-axis) changes in response to time.
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Identify the independent variable when a graph shows algae population versus nitrate level.
Identify the independent variable when a graph shows algae population versus nitrate level.
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Nitrate level. The independent variable (x-axis) is manipulated to observe effects.
Nitrate level. The independent variable (x-axis) is manipulated to observe effects.
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Which option best describes this trend: prey rises first, then predator rises, then prey falls?
Which option best describes this trend: prey rises first, then predator rises, then prey falls?
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Predator increase caused prey decline after a time lag. Classic predator-prey cycle showing population oscillations.
Predator increase caused prey decline after a time lag. Classic predator-prey cycle showing population oscillations.
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A fish kill occurs after dissolved oxygen drops from $8$ to $2$ mg/L. What change most likely caused it?
A fish kill occurs after dissolved oxygen drops from $8$ to $2$ mg/L. What change most likely caused it?
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Reduced oxygen availability limited fish survival. Fish require $>4$ mg/L dissolved oxygen to survive.
Reduced oxygen availability limited fish survival. Fish require $>4$ mg/L dissolved oxygen to survive.
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A lake’s phosphorus increases and algae rises sharply; underwater plants decline. What process is shown?
A lake’s phosphorus increases and algae rises sharply; underwater plants decline. What process is shown?
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Eutrophication. Excess nutrients cause algae blooms that block light to plants.
Eutrophication. Excess nutrients cause algae blooms that block light to plants.
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A pollutant reduces insect population; bird population falls two months later. What is the likely link?
A pollutant reduces insect population; bird population falls two months later. What is the likely link?
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Food shortage caused the bird decline. Birds depend on insects as their primary food source.
Food shortage caused the bird decline. Birds depend on insects as their primary food source.
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After wolves are reintroduced, deer decrease and young trees increase. What interaction explains this?
After wolves are reintroduced, deer decrease and young trees increase. What interaction explains this?
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Predation reduced herbivory, allowing plant recovery. Wolves control deer numbers, reducing browsing pressure on trees.
Predation reduced herbivory, allowing plant recovery. Wolves control deer numbers, reducing browsing pressure on trees.
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Choose the best claim: If average temperature rises, a cold-adapted species’ range shifts toward what direction?
Choose the best claim: If average temperature rises, a cold-adapted species’ range shifts toward what direction?
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Toward cooler areas (higher latitude or higher elevation). Species track their optimal temperature zones as climate changes.
Toward cooler areas (higher latitude or higher elevation). Species track their optimal temperature zones as climate changes.
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Identify the most supported conclusion when a population stabilizes near a horizontal line labeled $K$.
Identify the most supported conclusion when a population stabilizes near a horizontal line labeled $K$.
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The population reached carrying capacity ($K$). Growth stops when resources become limiting at carrying capacity.
The population reached carrying capacity ($K$). Growth stops when resources become limiting at carrying capacity.
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What is the term for a relationship in which both species benefit (+/+)?
What is the term for a relationship in which both species benefit (+/+)?
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Mutualism. Both organisms gain advantages from their interaction, like bees and flowers.
Mutualism. Both organisms gain advantages from their interaction, like bees and flowers.
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What is the term for a relationship in which one benefits and the other is unaffected (+/0)?
What is the term for a relationship in which one benefits and the other is unaffected (+/0)?
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Commensalism. One organism benefits while the other experiences no harm or help.
Commensalism. One organism benefits while the other experiences no harm or help.
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What is the term for a relationship in which both species are harmed (−/−) due to shared needs?
What is the term for a relationship in which both species are harmed (−/−) due to shared needs?
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Competition. Both organisms suffer when competing for the same limited resources.
Competition. Both organisms suffer when competing for the same limited resources.
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What is the term for a nonliving environmental factor such as temperature, rainfall, or pH?
What is the term for a nonliving environmental factor such as temperature, rainfall, or pH?
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Abiotic factor. Non-living components that influence living organisms in an ecosystem.
Abiotic factor. Non-living components that influence living organisms in an ecosystem.
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What is the term for a living environmental factor such as predators, prey, or disease organisms?
What is the term for a living environmental factor such as predators, prey, or disease organisms?
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Biotic factor. Living components that interact with and affect other organisms.
Biotic factor. Living components that interact with and affect other organisms.
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What is the term for a limiting factor whose impact increases as population density increases?
What is the term for a limiting factor whose impact increases as population density increases?
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Density-dependent limiting factor. Effects intensify in crowded populations, like disease spread or competition.
Density-dependent limiting factor. Effects intensify in crowded populations, like disease spread or competition.
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What is the term for a limiting factor that affects populations regardless of density?
What is the term for a limiting factor that affects populations regardless of density?
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Density-independent limiting factor. Affects all individuals equally, like natural disasters or climate events.
Density-independent limiting factor. Affects all individuals equally, like natural disasters or climate events.
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What is the term for the movement of individuals into a population, increasing its size?
What is the term for the movement of individuals into a population, increasing its size?
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Immigration. New individuals join from outside, adding to population numbers.
Immigration. New individuals join from outside, adding to population numbers.
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