Amplify Populations and Resources

The graph shows that the honeybee population was stable and then decreased. Which statement describes births and deaths when the honeybee population was stable?

• There was the same amount of births and deaths.

• There were more births than deaths.

• There were fewer births than deaths.

• There were no deaths.

A population of Mountain Lions lives in southern California. Over 20 years, the size of the Mountain Lion population in the region increased. What best explains the increase in the size of the Mountain Lion population?

• The Mountain Lions population is always increasing because no animal eats Mountain Lions

• More Mountain Lions were born than died.

• Fewer Mountain Lions were born than died.

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NGSS.MS-LS2-1

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When a populations is known to be STABLE, it:

• there are more deaths

• stays mostly the same, over time

• there are more births

• horses live there

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A resource population is:

• a population that is avoided by organisms

• a population that is traded between organisms

• a population that is eaten by organisms from another population

• a population that is never eaten because it doesn't taste good.

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NGSS.MS-LS2-1

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What do you think would happen to the lion population if the hyena population increases in size? Assume that the populations were stable before this change.

• The lion population would increase.

• The lion population would not change.

• The lion population would decrease.

• The hyena population would increase.

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NGSS.MS-LS2-1

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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.

• 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.

• 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.

• 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.

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NGSS.MS-LS2-1

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In the Arctic Ocean, sharks eat whales, and whales eat crabs. In the last 10 years, the sizes of the populations have been stable, but recently the size of the crab population increased. What will likely happen to the shark population?

The size of the shark population will . . .

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

• stay the same. Sharks do not eat crabs, so the number of births and deaths in the shark population will stay the same.

• increase. More energy storage molecules will be available to the shark population from the larger whale population, so the shark population will reproduce more. This will lead to more births than deaths in the shark population.

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

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NGSS.MS-LS2-1

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Foxes eat small animals called voles. In southern Sweden, scientists observed that when the vole population decreased, what will happen the fox population?

• Population will decrease

• Population will remain stable

• Population will increase

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

A population of Tule Elk lives in Bakersfield. Over 150 years, the size of the Tule Elk population decreased. What best explains the decreased in the size of the Tule Elk population?

• A lot of Tule Elk were born and none of them died.

• The Tule Elk population is always increasing because no animal eats Tule Elk.

• Fewer Tule Elk were born than died.

• More Tule Elk were born than died

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NGSS.MS-LS2-1

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?

The firefly population will . . .

• 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.

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

Tags

NGSS.MS-LS2-1

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