WorksheetsPopulations and Resources End of Unit Review
Total questions: 50
Worksheet time: 48mins
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.
Fewer tigers were born than died.
The tiger population is always increasing because no animal eats tigers.
More tigers were born than died.
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.
Fewer tigers were born than died.
The tiger population is always increasing because no animal eats tigers.
More 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 because there are less lizards eating them.
decrease because there are more lizards eating them.
stay the same
increase because there will be more energy storage molecules available for the fireflies to eat.
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 . . .
increase because there will be more rats to make energy.
decrease because the opossum population is taking more energy storage molecules from the rats.
stay the same because there are still energy storage molecules available.
decrease because the opossum population is using the fox population for energy storage molecules.
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?
A lot of bluefish died and no new bluefish were born.
Fewer bluefish were born than died.
More bluefish were born than died.
The bluefish population is always decreasing because bluefish are always being eaten.
Scientists have been studying the size of three populations in a region. In this ecosystem, lions eat wild pigs, and wild pigs eat frogs. The data showed that all three populations were stable. Then the frog population decreased suddenly. What will likely happen to the size of the wild pig population as a result?
The size of the wild pig population will . . .
increase because the wild pigs and lions will find energy storage molecules elsewhere.
decrease because there are less energy storage molecules available.
stay the same because the lions are still stable.
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
decrease
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.
Humans started protecting the duck population so they stopped dying.
No ducks were born and no ducks died.
The ducks did not have any baby ducks during these years.
Scientists have been studying the size of three populations in a swampland. In this ecosystem, herons (a type of bird) eat frogs, and frogs eat dragonflies. The data showed that all three populations were stable. Then the dragonfly population increased suddenly. What will likely happen to the frog population as a result?
The size of the frog population will . . .
increase
decrease
stay the same
In North America, both bears and eagles eat trout. The sizes of the populations have been stable for the last 9 years, but recently the size of the eagle population decreased. What will likely happen to the bear population?
The size of the bear population will . . .
increase
decrease
stay the same
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.
More 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.
Scientists have been studying the size of three populations in Peru. In this ecosystem, pumas (large wild cats) eat deer, and deer eat grass. The data showed that all three populations were stable. Then the puma population increased suddenly. What will most likely happen to the size of the deer population as a result?
The size of the deer population will . . .
increase
decrease
stay the same
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 . . .
increase because when one population increases, the others do too.
decrease because less seals are being eating, making them increase, and eating more cod.
stay the same
Define consumer population
when something becomes different over time
when two or more populations use the same resource, such as the same food source
a population that eats organisms from another population
población de consumidores
a scientist who studies the interactions of organisms with each other and their environment
Define change
when something becomes different over time
when something stays mostly the same over time
a small part that is meant to show what the whole is like
the result of one cause leading to an effect that causes one or more other effects
Define ecosystem
a scientist who studies the interactions of organisms with each other and their environment
a group of the same type of organism living in the same area
all the living and nonliving things interacting in a particular area
the process of creating offspring
Define competition
the ability to make things move or change
a molecule that organisms can use to release energy, and that is made of carbon, hydrogen, and oxygen atoms
a population that eats organisms from another population
when two or more populations use the same resource, such as the same food source
Define ecologist
the ability to make things move or change
a scientist who studies the interactions of organisms with each other and their environment
all the living and nonliving things interacting in a particular area
a molecule that organisms can use to release the energy needed to survive
Define energy
the ability to make things move or change
a molecule that organisms can use to release the energy needed to survive
a model that shows what eats what in an ecosystem
a molecule that organisms can use to release energy, and that is made of carbon, hydrogen, and oxygen atoms
Define population
a group of the same type of organism living in the same area
the process of creating offspring
a population that is eaten by organisms from another population
when two or more populations use the same resource, such as the same food source
Define food web
a model that shows what eats what in an ecosystem
the result of one cause leading to an effect that causes one or more other effects
a group of atoms joined together in a particular way
living things, such as plants, animals, and bacteria
Define sample
a population that is eaten by organisms from another population
when something stays mostly the same over time
a small part that is meant to show what the whole is like
the process of creating offspring
Define stability
when something stays mostly the same over time
when something becomes different over time
a scientist who studies the interactions of organisms with each other and their environment
a small part that is meant to show what the whole is like
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.
organism
An interacting group of various species in a common location
An individual animal, plant, or single-celled life form
A group of individuals of the same species inhabiting the same area.
A community of living organisms in conjunction with the nonliving components of their environment (things like air, water and mineral soil), interacting as a system.
community
An individual animal, plant, or single-celled life form
A group of individuals of the same species inhabiting the same area.
A community of living organisms in conjunction with the nonliving components of their environment (things like air, water and mineral soil), interacting as a system.
An interacting group of various species in a common location
population
A group of individuals of the same species inhabiting the same area.
An interacting group of various species in a common location
An individual animal, plant, or single-celled life form
A habitat supplying the necessary factors for existence
ecosystem
A habitat supplying the necessary factors for existence
An interacting group of various species in a common location
A group of individuals of the same species inhabiting the same area.
A community of living organisms in conjunction with the nonliving components of their environment (things like air, water and mineral soil), interacting as a system.
niche
living or once living organisms in an ecosystem
make their own food (plants)
non-living elements in an ecosystem
a habitat supplying the necessary factor for existence
consumer
Gets energy from eating other organisms.
Makes their own food (plants)
Gets energy from eating other organisms
An animal that naturally preys on others.
decomposer
Gets energy from eating other organisms
Recycle dead organisms into chemical nutrients used in soil, air, and water
Gets energy from eating other organisms
Make their own food (plants)
biotic
Living or once living organisms in an ecosystem.
Gets energy from eating other organisms
Non-living elements in an ecosystem.
Make their own food (plants)
producer
Make their own food (plants)
Gets energy from eating other organisms
Recycle dead organisms into chemical nutrients used in soil, air, and water
Living or once living organisms in an ecosystem.
abiotic
A habitat supplying the necessary factors for existence
Living or once living organisms in an ecosystem.
Gets energy from eating other organisms
Non-living elements in an ecosystem.
prey
Gets energy from eating other organisms
An animal that naturally preys on others.
Make their own food (plants)
An animal that is hunted and killed by another for food.
predator
Make their own food (plants)
An animal that naturally preys on others.
An animal that is hunted and killed by another for food.
An animal or plant on or in which a parasite lives.
parasite
An animal that naturally preys on others.
An animal or plant on or in which a parasite lives.
An animal that is hunted and killed by another for food.
An organism that lives in or on another organism (its host) and benefits by deriving nutrients at the host's expense.
host
An animal or plant on or in which a parasite lives.
An animal that is hunted and killed by another for food.
An animal that naturally preys on others.
An animal that is hunted and killed by another for food.
energy pyramid
Graphical model of energy flow in a community.
Make their own food (plants)
A network of food chains by which energy and nutrients are passed on from one living organism to another.
An animal or plant on or in which a parasite lives.
food web
An animal or plant on or in which a parasite lives.
Graphical model of energy flow in a community.
A network of food chains by which energy and nutrients are passed on from one living organism to another.
An organism that lives in or on another organism (its host) and benefits by deriving nutrients at the host's expense.
herbivores
eat both plants and meat
eat only meat
eat only plants
eat bodies of dead organisms
scavengers
eat bodies of dead organisms
eat only plants
eat only meat
eat both plants and meat
carnivores
eat only plants
eat only meat
eat both plants and meat
eat bodies of dead organisms
omnivores
eat both plants and meat
eat only plants
eat bodies of dead organisms
eat only meat
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.
increase. An increase in the size of any population leads to an increase in the sizes of all other populations in an ecosystem.
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.
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.
Scientists have been studying four populations in one area of the Atlantic Ocean. In this area, both tuna and dolphins eat squid, and squid eat herring (a type of fish). The data shows that recently the tuna population increased. How will the increase in the tuna population affect the other populations?
Increase Squid
Decrease Squid
Same Amount of Squid
Scientists have been studying four populations in one area of the Atlantic Ocean. In this area, both tuna and dolphins eat squid, and squid eat herring (a type of fish). The data shows that recently the tuna population increased. How will the increase in the tuna population affect the other populations?
Increase Dolphin
Decrease Dolphin
Same Amount of Dolphin
Scientists have been studying four populations in a swamp area. In this area, alligators eat gar (a type of large fish), and both gar and diving ducks eat crabs. The data showed that recently the alligator population has decreased. How could the decrease in the alligator population affect the other populations? The data showed that recently the alligator population has decreased. How could the decrease in the alligator population affect the other populations?
More Ducks
Fewer Ducks
Same amount of Ducks
Scientists have been studying four populations in a swamp area. In this area, alligators eat gar (a type of large fish), and both gar and diving ducks eat crabs. The data showed that recently the alligator population has decreased. How could the decrease in the alligator population affect the other populations? The data showed that recently the alligator population has decreased. How could the decrease in the alligator population affect the other populations?
More Crabs
Fewer Crabs
Same Amount of Crabs
