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?

More Mountain Lions were born than died.

Fewer Mountain Lions were born than died.

When a populations is known to be STABLE, it:

stays mostly the same, over time

Energy storage molecules are:

a molecule that organisms can use to release the energy needed to survive

molecules required only for the birth rate

a molecule organisms use to stabilize a population

An indirect effect is:

the result of one cause leading to an effect that causes one or more other effects

the result of one cause stopping a desired effect

the result of more than one cause leading to the death rate of a population

when there is a direct relationship between one organism and the next

A resource population is:

a population that is eaten by organisms from another population

a population that is avoided by organisms

a population that is traded between organisms

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

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 decrease.

The lion population would increase.

The lion population would not change.

The hyena population would increase.

There are 3 populations in a grassland ecosystem: lizards eating fireflies, and fireflies eating gnats (insects). Suddenly, the lizard population decreased. What will probably happen to the size of the population of fireflies

Increase due to fewer energy storage molecules needed by the lizards so they will eat fewer fireflies. Thus, leading to fewer deaths deaths than births in the firefly population

Decrease due to a decrease in any population causes a decrease in the sizes of all other populations in the ecosystem

Stay the same due to the size of the resource population not changing, so the amount of energy storage molecules available for the fireflies did not change. Thus, the number of births and deaths in the firefly population will be the same

Increase due to the lizard population leaving more energy storage molecules available for the firefly population to reproduce more. Thus, leading to more births in the firefly population

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?

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.

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.

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.

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 . . .

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.

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

Populations and Resources Final Test

Authored by J JeanJoseph

Science

6th - 7th Grade

NGSS covered

Used 28+ times

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20 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which statement describes births and deaths when the population was decreasing?

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.

Tags

NGSS.MS-LS2-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What ideas do you have about what could cause the number of births to increase in a population?

Increased number of deaths and birth rate remained the same.

Increased number of births and deaths

Decreased number of births and deaths

Decreased number of deaths and increased number of deaths.

Tags

NGSS.MS-LS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The diagram above is called a food web. It shows the relationship between foxes and voles. What does the food web show?

foxes eat voles

voles eat foxes

voles compete with foxes

foxes compete with voles

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Ecologists gather a lot of evidence from ecosystems. One useful piece of evidence is what each population eats. How do you think knowing “what eats what” helps ecologists to explain changes in population size?

Ecologists need to know what populations eat because changes to the size of consumer or resource populations can change the size of other populations.

Ecologists do not need to know what populations eat because changes to the size of populations can never change.

Ecologists need to know what populations eat because changes to the weather can change the size of populations.

Economist need to know what populations eat because changes to the food web can change the size of other populations.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

NGSS.MS-LS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

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Populations and Resources Final Test

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

Which statement describes births and deaths when the population was decreasing?

What ideas do you have about what could cause the number of births to increase in a population?

The diagram above is called a food web. It shows the relationship between foxes and voles. What does the food web show?

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

Ecologists gather a lot of evidence from ecosystems. One useful piece of evidence is what each population eats. How do you think knowing “what eats what” helps ecologists to explain changes in population size?

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 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?

Two organisms fighting for the same resources is known as:

When a populations is known to be STABLE, it:

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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?