Download Science department Quarter (2) Revision sheet 2014/2015 Grade 6

Science department
Quarter (2) Revision sheet
2014/2015
Grade 6
Name:
True/False
Class:
____
1. A food chain is the feeding relationships among all of the organisms in an ecosystem.
____
2. Competition occurs when organisms try to use the same limited resource.
____
3. Biomes are characterized by temperature, precipitation, and the plant and animal communities that
live there.
____
4. A habitat is the role of a population in its community, including its environment and its relationship
with other species.
____
5. A material resource is a renewable resource only that is used to make objects.
____
6. Rocks, water, air, minerals, forests, wildlife, and soil are all examples of a natural resource.
Multiple Choice
____
1. What is the primary role of decomposers in an ecosystem?
A.
B.
C.
D.
____
2. Some consumers, such as many flying insects, need large amounts of energy to grow and move from
one place to another. How do consumers get energy to function?
A.
B.
C.
D.
____
to control the population of producers and consumers
to compete with producers for energy and other resources
to provide a source of energy for the producers in the ecosystem
to recycle energy and materials from dead producers and consumers
Consumers obtain all of their energy by eating other organisms.
Consumers obtain some energy from other organisms and some from sunlight.
Consumers obtain most of their energy by absorbing it from their environments.
Consumers convert light energy from the sun into chemical energy stored in food.
3. The figure below shows a food chain that might exist in a field or meadow.
Which organism is the primary consumer in this food chain?
A.
B.
C.
D.
____
owl
toad
beetle
plant leaf
4. Which statement describes a difference between decomposers and consumers in an ecosystem?
A. Decomposers are types of plants, whereas consumers are types of animals.
B. Decomposers remain in one place, but consumers move around within the
ecosystem.
C. Decomposers get energy only from plant materials, and consumers eat both plants
and animals.
D. Decomposers can obtain energy by digesting chemical compounds that consumers
cannot digest.
____
5. Coal is a natural resource. Why is coal considered nonrenewable?
A.
B.
C.
D.
____
6. Which of the following statements best describes how natural resources benefit humans?
A.
B.
C.
D.
____
Coal will never run out.
No new coal is being produced on Earth.
Coal is used to produce energy and not materials.
Coal is being used faster than it is being produced.
Natural resources save us money.
Natural resources help us to survive.
Natural resources are readily available.
Natural resources exist in nearly unlimited supplies.
7. Why are decomposers an essential part of a healthy ecosystem?
A. Decomposers are a necessary part of the diet of most consumers.
B. Decomposers convert plant material into a form that primary consumers can use.
C. Decomposers make resources available to producers by breaking down waste
materials.
D. Decomposers extract energy from sunlight as they break down plant materials,
adding returning energy to the system.
____
8. Grizzly bears diet consists of roots, tubers, berries, nuts, fungus, insects, rodents, and fish. What
ecological role best describes grizzly bears?
A.
B.
C.
D.
carnivores
omnivores
herbivores
producers
____
9. Which of the following is an example of a predator-prey relationship?
A.
B.
C.
D.
A plant is a predator, and a fox is its prey.
A fox is a predator, and a bear is its prey.
A fox is a predator, and a rabbit is its prey.
A mouse is a predator, and a fox is its prey.
____ 10. The diagram below shows feeding relationships among some organisms in an ecosystem.
Based on the information shown in the diagram, which answer best describes the relationship
between hawks and coyotes?
A.
B.
C.
D.
Coyotes are parasites of hawks.
Coyotes are predators of hawks.
Coyotes and hawks are both prey.
Coyotes and hawks compete for the same food.
____ 11. Sometimes, a renewable resource can be considered nonrenewable because it is used up faster than it
can be replenished. Which of the following choices is an example of this?
A.
B.
C.
D.
Coal supply dwindling because it takes millions of years to form.
Forests being cut down at a quicker rate than they can grow.
Solar energy being used to provide electricity to a home.
Water in streams replaced by rainfall from the atmosphere.
____ 12. Which of the following is not a resource that two birds living in the same tree would likely compete
for?
A.
B.
C.
D.
oxygen in the air to breathe
other birds with which to mate
twigs with which to build a nest
seeds growing on the tree to eat
____ 13. A small fish called a cleaner wrasse, darts in and out of a larger fish’s mouth, removing and eating
parasites and dead tissue. Which term best describes the relationship between the cleaner wrasse and
the larger fish?
A.
B.
C.
D.
mutualism
commensalism
parasitism
competition
____ 14. After a mild winter and plenty of food, a deer population grew rapidly. What most likely happened
to the wolf population in that ecosystem?
A.
B.
C.
D.
The wolf population was unaffected.
The wolf population grew.
The wolf population shrunk.
The wolf population went extinct.
____ 15. How is an organism’s niche different from its habitat?
A.
B.
C.
D.
Its niche is the organism’s role within the habitat.
Its niche is the climate that exists within the habitat.
Its niche is the place where an organism lives within a habitat.
Its niche is the size of the population to which the organism belongs.
____ 16. Which of the following is a biotic factor in an ecosystem?
A.
B.
C.
D.
wind
tree leaves
small rocks
light from the sun
____ 17. Which of these statements describes a species?
A.
B.
C.
D.
A species is a group of organisms that are closely related.
A species is a group of organisms that live in the same habitat.
A species is a group of organisms that live in an area and interact.
A species is a group of organisms that are closely related and produce fertile
offspring.
____ 18. Which of the following determines where a population can live?
A.
B.
C.
D.
whether its needs are met by the biotic factors in the habitat
whether its needs are met by the abiotic factors in the habitat
whether its needs are met by the abiotic and biotic factors in the habitat
whether its needs are met by the other populations of organisms in the habitat
____ 19. Which of the following statements best describes the relationship between ecosystems and biomes?
A. A biome may contain many ecosystems, and ecosystems within the same biome
are typically home to similar species of organisms.
B. An ecosystem may contain many biomes, and biomes within the same ecosystem
are typically home to similar species of organisms.
C. Both biomes and ecosystems are characterized by their climate conditions and the
communities that live in them; however, biomes refer to land environments and
ecosystems refer to aquatic environments.
D. Both biomes and ecosystems are characterized by their climate conditions and the
communities that live in them; however, ecosystems refer to land environments
and biomes refer to aquatic environments.
____ 20. Which of the following organisms is most likely to be a pioneer species in an ecosystem?
A.
B.
C.
D.
a tall tree
moss
a shrub
a mouse
____ 21. How does natural eutrophication affect a pond ecosystem?
A.
B.
C.
D.
It causes nutrients to build up.
It causes temperatures to rise.
It causes the pond to become deeper.
It causes a change in the flow of water.
____ 22. Which statement best describes ecosystems?
A.
B.
C.
D.
They can never change once they are established.
They constantly change in different ways over time.
Ecosystems always revert back to their original state.
Each ecosystem can exist for only a specific length of time.
____ 23. How is secondary succession different from primary succession?
A. Secondary succession occurs after a disturbance in an area that was previously
uninhabited.
B. Secondary succession occurs after a disturbance in an area in which the soil has
remained intact.
C. Secondary succession occurs over a longer period of time than primary succession.
D. Secondary succession occurs when animals are introduced to an area that had only
plants.
____ 24. Which term best describes the number and variety of organisms in a given area during a specific
period of time?
A.
B.
C.
D.
carrying capacity
biodiversity
succession
eutrophication
____ 25. How do pioneer species make ecological succession possible on an island formed from volcanic
eruptions?
A.
B.
C.
D.
They use chemicals to produce food.
They establish homes in which animals can live.
They break down rock into soil in which plants can grow.
They adjust the climate by altering the average temperature in a region.
____ 26. How is the number of species in an ecosystem related to the stage of ecological succession?
A.
B.
C.
D.
The number of species increases as succession proceeds.
The number of species decreases as an ecosystem becomes mature.
The number of species present when succession begins remains the same.
The number of species increases and then decreases as succession proceeds.
____ 27. Which of the following would most likely be a pioneer species as an area undergoes succession?
A.
B.
C.
D.
mosses
squirrels
plankton
coniferous trees
____ 28. What does biodiversity indicate about an ecosystem?
A.
B.
C.
D.
the location of the ecosystem
the overall size of the ecosystem
the ability of the ecosystem to survive change
the identify of the organisms that began ecological succession in the ecosystem
____ 29. Which of the following might result from the process of natural eutrophication?
A.
B.
C.
D.
A pond becomes a meadow.
A rock breaks down into soil.
A glacier retreats to expose new land.
A non-native species takes resources from native species.
____ 30. The following table lists the number and variety of organisms in four different ecosystems.
Plants
Animals
# of
# of
# of
# of
Organisms
Species
Organisms
Species
Ecosystem 1
500
5
300
4
Ecosystem 2
300
10
100
7
Ecosystem 3
100
2
200
5
Ecosystem 4
50
6
30
4
Based on the table, which ecosystem is likely the most sustainable?
A. Ecosystem 1
B. Ecosystem 2
C. Ecosystem 3
D. Ecosystem 4
____ 31. What happens when resource depletion occurs?
A.
B.
C.
D.
chemicals are spilled or dumped into water
nutrients are added to an aquatic ecosystem
a large fraction of a specific resource is used up
materials are changed in form so they can be reused
____ 32. How does an increase in the human population affect ecosystems?
A.
B.
C.
D.
A larger human population increases Earth’s biodiversity.
A larger human population has a greater need for natural resources.
A larger human population produces more natural resources for living things.
A larger human population helps matter cycle through ecosystems more quickly.
____ 33. Which of the following strategies is most likely to help conserve natural resources?
A.
B.
C.
D.
spraying chemical fertilizers on crops
investing in power plants that burn fossil fuels
leaving electronic devices running when not in use
taking buses or subways to work rather than driving cars
____ 34. What will most likely happen to a native species if an exotic species outcompetes it for food?
A.
B.
C.
D.
The native species will become extinct.
The native species will adapt to less food.
The native species will find another food source.
The native species will use the exotic species for food.
____ 35. How might the channelization of rivers affect populations in river ecosystems?
A.
B.
C.
D.
Aquatic species might find new food sources.
Aquatic species might require different nutrients.
Aquatic species might adapt to land environments.
Aquatic species might lose the conditions they need to survive.
____ 36. Resource depletion, pollution, and habitat loss are all environmental problems caused by what
factor?
A.
B.
C.
D.
acid rain
eutrophication
introduced species
human activities
____ 37. Which of the following resources is considered inexhaustible?
A.
B.
C.
D.
____38.
minerals
trees
solar energy
fossil fuels
Which of the materials shown here could be classified as an inexhaustible natural resource?
A.
B.
C.
D.
trees
water
cattle
sunlight
____ 39. Trees can be classified as different kinds of resources. Which of these statements gives a reason for
classifying a tree as an energy resource?
A.
B.
C.
D.
It is a renewable resource.
It can be used to build a home.
It can be burned to provide heat.
It requires energy to grow a tree.
____ 40. Coal is a natural resource. Why is coal considered nonrenewable?
A.
B.
C.
D.
Coal will never run out.
No new coal is being produced on Earth.
Coal is used to produce energy and not materials.
Coal is being used faster than it is being produced.
Good Luck
____ 42. Which of the following statements best describes how natural resources benefit humans?
A.
B.
C.
D.
Natural resources save us money.
Natural resources help us to survive.
Natural resources are readily available.
Natural resources exist in nearly unlimited supplies.
____ 43. Which of the following would be considered a natural resource?
A.
B.
C.
D.
rock
glass
steel
concrete
____ 44. Hydroelectric dams like the one shown below are often used to produce electric power.
Which of these terms best describes the role of water in this power system?
A.
B.
C.
D.
a created resource
a material resource
an energy resource
a nonrenewable resource
____ 45. Trees can be classified as different kinds of resources.
Based on this figure, what is the best classification for these trees?
A.
B.
C.
D.
material resource
renewable resource
endangered resource
nonrenewable resource
____ 46. Sometimes, a renewable resource can be considered nonrenewable because it is used up faster than it
can be replenished. Which of the following choices is an example of this?
A.
B.
C.
D.
Coal supply dwindling because it takes millions of years to form.
Forests being cut down at a quicker rate than they can grow.
Solar energy being used to provide electricity to a home.
Water in streams replaced by rainfall from the atmosphere.
____ 47. Which of the following natural resources is renewed by non-living processes?
A.
B.
C.
D.
water
forests
wildlife
agricultural crops
____ 48. Why are fossil fuels such rich sources of energy for humans, but rocks are not?
A.
B.
C.
D.
Rocks are too old to contain energy.
Rocks are too difficult to extract from Earth.
Fossil fuels contain energy-rich carbon from once-living organisms.
Both rocks and fossil fuels contain carbon-based energy from dead organisms, but
fossil fuels are easier to burn.
____ 49. The line graph below shows the average amount of dissolved nutrients in a body of water each year
from 1998 to 2003.
Which human activity most likely affected this body of water between 2000 and 2003?
A.
B.
C.
D.
burning fossil fuels
dumping litter in the water
adding chemical fertilizers to water
discharging warm water into the body of water
____ 50. Over the course of many years, a rural farm town becomes more urban. Which of the following will
most likely happen in the town as a result of this urbanization?
A.
B.
C.
D.
The amount of rainfall will increase.
Rivers may be contaminated by sewage.
Light pollution in the town may decrease.
People will develop more farms in the town.