A consumer population is

a population that eats organisms from another population

a population that is eaten by organisms from another population

a population that uses up more energy than other populations

a population that gets it's energy all from plants

How can we define energy?

as the ability to make things move or change

as the ability to go up or down

as the ability to go in circles

What is a population?

a group of the same type of organism living in the same area

a group of similar organisms in an ecosystem

a group of people attending a movie

a group of different types of organisms in the same area

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?

More tigers were born than died.

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.

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.

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.

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? The size of the fox population will . . .

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.

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.

A population of bluefish lives in the Gulf of Mexico. Over the last 50 years, the size of the bluefish population has decreased . What best explains the decrease in the size of the bluefish population?

Fewer bluefish were born than died.

A lot of bluefish died and no new bluefish were born.

More bluefish were born than died.

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

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.

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

A large population of ducks lives in an area with a lake. In the last 40 years, the size of the duck population has stayed the same . What must be true about the duck population during the last 40 years?

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

No ducks were born and no ducks died.

Humans started protecting the duck population so they stopped dying.

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

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.

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

In the Arctic region, polar bears eat seals, and seals eat cod (a type of fish). In the last 7 years, the sizes of all the populations stayed stable, but recently the size of the polar bear population decreased. What will likely happen to the cod population? The size of the cod population will . . .

decrease. The smaller polar bear population will lead to more seals. The larger seal population will need more energy storage molecules to reproduce, so they will eat more cod. This will lead to more deaths than births in the cod population.

decrease. A decrease in the size of one population leads to a decrease in the sizes of all other populations in an ecosystem.

stay the same. Polar bears do not eat cod, so the number of births and deaths in the cod population will stay the same.

increase. The smaller polar bear population will leave more energy storage molecules available in the ecosystem for the cod population, so there will be more births in the cod population.

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.

What causes a population size to decrease?

The number of deaths is greater than the number of births.

The number of births is greater than the number of deaths.

The number of births and the number of deaths is equal.

What causes a population size to increase?

The number of births is greater than the number of deaths.

The number of deaths is greater than the number of births.

The number of births and the number of deaths is equal.

Within a population, organisms are always…

dying of old age and eating other things.

If the population size stays stable, does this mean that no organisms have been born or died?

No, because if some organisms are born and the same number of organisms die, then the total population size can stay constant.

Yes, because if organisms were born or died that would change the number of organisms in the population.

Yes, because some organisms never die, so they don't need to reproduce.

No, because all organisms will give birth and then die.

Based on this graph, what must be true about the US honeybee population?

There are more deaths than births occurring.

There are more births than deaths occurring.

There is an equal number of deaths and births occurring.

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

A molecule that organisms can use to release energy, and that is made up of carbon, hydrogen, and oxygen atoms

A group of atoms joined together in a particular way

A molecule that organisms can use to release energy, and that is made up of carbon, hydrogen, and oxygen atoms

the variable that you'll change. It is what you are trying to see the effect of.

the variable you'll observe and record. It's the result.

Populations and Resources

Authored by Emily Adams

Science, Biology

6th - 8th Grade

NGSS covered

Used 2+ times

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41 questions

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MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Which best describes what a food chain shows you?

Energy flow through an ecosystem

Food flowing through an ecosystem

Consumers going into other consumers

Who eats who

Tags

NGSS.MS-LS2-3

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

The arrows in a food chain or web represents what?

They point to the organism that is being eaten.

It shows how sunlight flows within an ecosystem.

They show what direction the energy is flowing between organisms.

They represent how water is transferred within a habitat.

Tags

NGSS.MS-LS2-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

all the living and nonliving things interacting in a particular area

ecosystem

ecologist

exosystem

ecology

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

MULTIPLE SELECT QUESTION

30 sec • 1 pt

Check all the things that could be found in an ecosytem.

animals

plants

rocks

streams

Tags

NGSS.MS-LS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

living things, such as plants, animals, and bacteria are called

organisms

organ systems

organ music

organizations

Tags

NGSS.MS-LS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

when two or more populations use the same resource, such as the same food source

competition

completion

cooperation

consumerism

Tags

NGSS.MS-LS2-1

MULTIPLE SELECT QUESTION

30 sec • 1 pt

Check all the following that are organisms.

elk

soil

bacteria

pine trees

Tags

NGSS.MS-LS1-1

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Populations and Resources

Which best describes what a food chain shows you?

The arrows in a food chain or web represents what?

all the living and nonliving things interacting in a particular area

Check all the things that could be found in an ecosytem.

living things, such as plants, animals, and bacteria are called

when two or more populations use the same resource, such as the same food source

Check all the following that are organisms.

A consumer population is

a scientist who studies interactions of organisms with each other and their environment

What type of scientist might be most likely to work with an ecologist?

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