[DIGITAL] Populations and Resources

A population of tigers lives in Bangladesh. Over 50 years, the size of the tiger population increased. What best explains the increase in the size of the tiger population?

• A lot of tigers were born and none of them died.

• The tiger population is always increasing because no animal eats tigers.

• Fewer tigers were born than died.

• More tigers were born than died.

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NGSS.MS-LS2-4

Scientists have been studying the size of three populations in a grassland. In this ecosystem, lizards eat fireflies, and fireflies eat gnats (a type of insect). The data showed that all three populations were stable. Then the lizard population decreased suddenly. What will most likely happen to the size of the firefly population as a result?

• increase. The smaller lizard population will need fewer energy storage molecules so they will eat fewer fireflies. This will lead to fewer deaths than births in the firefly population.

• increase. The smaller lizard population will leave more energy storage molecules available for the firefly population to reproduce more. This will lead to more births in the firefly population.

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

• decrease. A decrease in any population causes a decrease in the sizes of all other populations in the ecosystem.

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NGSS.MS-LS2-4

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Elephants eat grass. What is the consumer population?

• Elephants

• Grass

• Both are the consumer population

• Neither are the consumer population

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NGSS.MS-LS2-1

In Australia, both opossums and foxes eat rats. The sizes of the populations have been stable for the last 12 years, but recently the size of the opossum population increased. What will likely happen to the fox population?

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

• stay the same. Opossums and foxes do not eat each other, so the number of births and deaths in the fox population will stay the same.

• decrease. The larger opossum population will leave fewer energy storage molecules for all other populations in the ecosystem, so the fox population will reproduce less. This will lead to fewer births than deaths in the fox population.

• decrease. Fewer energy storage molecules will be available to the fox population from the smaller rat population, so the fox population will reproduce less. This will lead to fewer births than deaths in the fox population.

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NGSS.MS-LS2-4

NGSS.MS-LS2-1

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A population of mice lives in the northeastern United States. Over the last 50 years, the size of the mouse population decreased. What best explains the decrease in the size of the mouse population?

• Fewer mice were born than died.

• A lot of mice died and no new mice were born.

• More mice were born than died.

• The mouse population is always decreasing because mice are always being eaten.

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-1

Moon Jelly populations are decreasing. Why?

• There are more births than deaths

• There are less births than deaths

• The population is stable

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NGSS.MS-LS2-4

NGSS.MS-LS2-1

What do organisms use energy for?

• Digesting food

• Reproduction

• Moving around

• Everything they do to survive

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The Human population is increasing worldwide. What does that mean?

• More births than deaths

• Less births than deaths

• A lot of births and NO deaths

• There is an equal number of births and deaths

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NGSS.MS-ESS3-4

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?

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

• Fewer panthers were born than died.

• More panthers were born than died.

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

Tags

NGSS.MS-LS2-4

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?

• increase. The larger tiger population will lead to fewer wild pigs. The smaller wild pig population will need fewer energy storage molecules to reproduce, so they will eat fewer worms. This will lead to more births than deaths in the worm population.

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

• stay the same. Tigers do not eat worms, so the number of births and deaths in the worm population will stay the same.

• decrease. The larger tiger population will leave fewer energy storage molecules available in the ecosystem for the worm population, so there will be fewer births in the worm population.

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NGSS.MS-LS2-4

NGSS.MS-LS2-1

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