How would an increase in the opossum population affect the fox population?

No effect on the fox population

Cause the fox population to migrate

If the lizard population decreases, what will most likely happen to the firefly population?

The firefly population will increase.

The firefly population will decrease.

The firefly population will remain the same.

The firefly population will become extinct.

If the gnat population increased, what could happen to the lizard population?

The lizard population will increase.

The lizard population will decrease.

The lizard population will remain the same.

The lizard population will become extinct.

In an experiment where 2 groups of crickets were given different amounts of sugar in their food, which group reproduced more and why?

Group A, because they had more energy from sugar.

Group B, because they had less energy from sugar.

Both groups reproduced equally.

A population of panthers lives in the southeastern United States. Over 50 years, the size of the panther population in the region increased. What best explains the increase in the size of the panther population?

More panthers were born than died.

The panther population is always increasing because no animal eats panthers.

Fewer panthers were born than died.

A lot of panthers were born and none of them died.

Scientists have been studying the size of three populations along the coast of Antarctica. In this ecosystem, penguins eat sardines, and sardines eat zooplankton. The data showed that all three populations were stable. Then the penguin population decreased suddenly. What will likely happen to the size of the sardine population as a result?

The sardine population will increase.

The sardine population will decrease.

The sardine population will remain stable.

The sardine population will become extinct.

In a mountain region, tigers eat wild pigs, and wild pigs eat worms. In the last 5 years, the sizes of the populations have been stable, but recently the tiger population has increased. What will likely happen to the worm population?

The worm population will decrease because there are fewer wild pigs to eat them.

The worm population will increase because there are more tigers.

The worm population will stay the same because the tigers do not eat worms.

The worm population will increase because the wild pigs will eat more worms.

A population of deer lives in Canada. Over 50 years, the size of the deer population decreased. What best explains the decrease in the size of the deer population?

Fewer deer were born than died.

A lot of deer died and no deer were born.

The deer population is always decreasing because deer are always being eaten.

Scientists have been studying the size of three populations in a grassland. In this ecosystem, hawks eat sparrows, and sparrows eat seeds from buckwheat. The data showed that all three populations were stable. Then the hawk population increased suddenly. What will likely happen to the size of the sparrow population as a result?

decrease. The larger hawk population will need more energy storage molecules, so they will eat more sparrows. This will lead to more deaths than births in the sparrow population.

stay the same. The size of their resource population did not change, so the amount of energy storage molecules available for the sparrows did not change. There will be the same number of births and deaths in the sparrow population.

decrease. The larger hawk population will leave fewer energy storage molecules available for the sparrows, so the sparrow population will reproduce less. This will lead to fewer births in the sparrow population.

increase. The sparrow population will have more food available, leading to more births than deaths.

In a rainforest, anteaters eat ants, and ants eat aphids. The sizes of the populations have been stable for the last 10 years, but recently the size of the aphid population decreased. What will likely happen to the anteater population?

decrease. Fewer energy storage molecules will be available to the anteater population from the smaller ant population, so the anteater population will decrease.

stay the same. Anteaters do not eat aphids, so the number of births and deaths in the anteater population will stay the same.

increase. An increase in any population leads to an increase in the sizes of all other populations in the ecosystem.

A large population of squirrels lives in a forest. In the last 50 years, the size of the squirrel population has stayed the same. What must be true about the squirrel population during the last 50 years?

The number of squirrels that were born was the same as the number of squirrels that died.

Humans started protecting the squirrel population so they stopped dying.

The squirrels did not have any baby squirrels during these years.

No squirrels were born and no squirrels died.

Scientists have been studying the size of three populations in a grassland. In this ecosystem, snakes eat rats, and rats eat grasshoppers. The data showed that all three populations were stable. Then the grasshopper population decreased suddenly. What will likely happen to the size of the rat population as a result?

decrease. A decrease in any population leads to a decrease in the sizes of all other populations in the ecosystem.

stay the same. The size of their consumer population did not change, so the number of deaths in the rat population did not change. There will be the same number of births and deaths in the rat population.

increase. The smaller grasshopper population will need fewer energy storage molecules so there will be more energy storage molecules available for the rat population to reproduce. This will lead to more births in the rat population.

fluctuate randomly without any pattern.

A population of sharks lives in the Atlantic Ocean. Over the last 50 years, the size of the shark population increased. What best explains the increase in the size of the shark population?

More sharks were born than died.

A lot of sharks were born and no sharks died.

The shark population is always increasing because no animal eats sharks.

Fewer sharks were born than died.

Scientists have been studying the size of three populations in a river in Ireland. In this ecosystem, pike (a type of big fish) eat perch (a type of small fish), and perch eat snails. The data showed that all three populations were stable. Then the snail population increased suddenly. What will likely happen to the size of the perch population as a result?

The perch population will increase.

The perch population will decrease.

The perch population will remain stable.

The perch population will become extinct.

The size of the perch population will . . .

increase. The larger snail population will provide more energy storage molecules for the perch population, so they will reproduce more. This will lead to more births than deaths in the perch population.

increase. An increase in any population within an ecosystem will lead to an increase in the sizes of all other populations in the ecosystem.

stay the same. The size of its consumer population did not change, so the number of deaths in the perch population did not change. There will be the same number of births and deaths in the perch population.

decrease. The larger snail population will take more energy storage molecules from the ecosystem, leaving fewer available for the perch population. This will lead to more deaths than births in the perch population.

In a rainforest, both spiders and frogs eat flies. The sizes of the populations have been stable for the last 10 years, but recently the size of the frog population decreased. What will likely happen to the spider population?

Increase. The smaller frog population will leave more energy storage molecules for all other populations in the ecosystem, so all populations will reproduce more. This will lead to more births in the spider population.

Decrease. The smaller frog population will lead to less competition for flies, reducing the spider population.

Stay the same. The change in frog population does not affect the spider population.

Disappear. The spider population will not survive without the frog population.

Why will the spider population reproduce more if the fly population is larger?

More energy storage molecules are available

Populations and Resources - Study Guide

Authored by Cody Napier

Science

8th Grade

NGSS covered

Used 2+ times

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45 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An ecosystem is made up of __________________ and non-living things.

Plants

Animals

Living

Water

Tags

NGSS.MS-LS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

True or False: A system can be stable even as things are being added to and removed from it.

True

False

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A __________________ population is the population that gets eaten by others.

Predator

Consumer

Resource

Producer

Tags

NGSS.MS-LS2-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An organism is best defined as:

Many individuals of the same species living in the same area.

All of the living and nonliving things in a particular area.

An individual plant, animal, fungus, or single-celled life form.

A creature that is large enough to see without using a microscope.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

True or False: The less energy storage molecules available to a population, the more the organisms within the population can reproduce.

True

False

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-3

NGSS.MS-LS1-6

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If the consumer population decreases, then the resources population will __________.

decrease

increase

remain the same

disappear

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-3

NGSS.MS-LS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If a population is decreasing, then this means there are births than .

more, deaths

fewer, deaths

more, resources

fewer, resources

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-1

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Populations and Resources - Study Guide

An ecosystem is made up of __________________ and non-living things.

True or False: A system can be stable even as things are being added to and removed from it.

A __________________ population is the population that gets eaten by others.

An organism is best defined as:

True or False: The less energy storage molecules available to a population, the more the organisms within the population can reproduce.

If the consumer population decreases, then the resources population will __________.

If a population is decreasing, then this means there are births than .

If a population is increasing, then this means there are births than .

When 2 or more populations use the same resource, such as a food source, they are in __________________________.

How would an increase in the opossum population affect the fox population?

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Discover more resources for Science

Populations and Resources - Study Guide

An ecosystem is made up of __________________ and non-living things.

True or False: A system can be stable even as things are being added to and removed from it.

A __________________ population is the population that gets eaten by others.

An organism is best defined as:

True or False: The less energy storage molecules available to a population, the more the organisms within the population can reproduce.

If the consumer population decreases, then the resources population will __________.

If a population is decreasing, then this means there are __________ births than __________.

If a population is increasing, then this means there are __________ births than __________.

When 2 or more populations use the same resource, such as a food source, they are in __________________________.

How would an increase in the opossum population affect the fox population?

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Discover more resources for Science

If a population is decreasing, then this means there are births than .

If a population is increasing, then this means there are births than .