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WorksheetsEcology Cycling of Matter
Total questions: 21
Worksheet time: 11mins
Fossil fuels are part of which of these cycles?
carbon
oxygen
nitrogen
phosphorus
Which two biogeochemical cycles depend directly on photosynthesis?
the oxygen cycle and the carbon cycle
the carbon cycle and the phosphorus cycle
the nitrogen cycle and the phosphorus cycle
the water cycle and the oxygen cycle
Which process is part of the hydrologic cycle?
sedimentation
transpiration
nitrification
decomposition
Which statement describes a difference between the nitrogen & carbon cycles?
The carbon cycle involves only plants.
The nitrogen cycle requires a process called fixation that is carried out by certain bacteria
the nitrogen cycle occurs entirely in the ocean
the carbon cycle requires that temperatures be above 80 F
Elements such as carbon can move through the environment and organisms in a cycle because living and nonliving things interact in __________.
organisms
ecosystems
species
cells
Which cycle do humans have the biggest impact upon?
Water cycle
Carbon cycle
Nitrogen cycle
Phosphorus cycle
Which cycle does NOT involve death & decomposition of organisms?
Water cycle
Nitrogen cycle
Carbon cycle
Phosphorus cycle
The carbon cycle makes carbon compounds continuously available in an ecosystem and delivers:
water to all organisms
light energy to autotrophs
CO2 to animals within the ecosystem
chemical energy to organisms within the ecosystem
What happens during the process of nitrogen fixation?
Bacteria change ammonium into nitrate.
Bacteria convert gaseous nitrogen into ammonia.
Bacteria grow on nodules on plant roots
Bacteria absorb ammonia and excrete ammonium.
Bacteria are important in the nitrogen cycle because they __________.
produce sugars that plants can use
respire, returning carbon dioxide into the atmosphere
help convert nitrogen into a form that organisms can use
decay and eventually form fossil fuels
When humans and animals die, phosphorus __________.
returns to the soil
evaporates into the atmosphere
is dissolved in water
is decomposed by decomposers
Which of these is common to the carbon cycle, the nitrogen cycle, and the water cycle?
The largest reserves of the substance are always in organisms.
The substance must pass through organisms in order to complete its cycle
The ocean is a reservoir for all three substances.
Substance is required by all living things & is involved in many processes that occur in all living things.
Which is a possible effect of introducing too much nitrogen & phosphorus into an aquatic ecosystem?
Fish populations would increase
Water would become more clear
Aquatic life would die off
Oxygen levels would increase
Which cycle does not involve the hydrosphere?
Water cycle
Carbon cycle
Nitrogen cycle
Phosphorus cycle
The process of water loss by plants
Ammonification
Evaporation
Transpiration
Reservoir
The remains of living things that have been buried for millions of years
Assimilation
Fossil fuels
Gasoline
Glacier
seeping of water into the soil
reservoir
ground water
percolation
evaporation
the conversion of ammonium into nitrate
nitrification
combustion
transpiration
nitrogen fixation
the return of nitrogen to the soil as ammonium
nitrification
ammonification
nitrogen fixation
assimilation
conversion of gaseous nitrogen into ammonia
ammonification
nitrogen fixation
percolation
nitrification
What is eutrophication?
ponds getting dirty
the depletion of oxygen in a pond or lake
an overgrowth of algae in a pond or lake
the production of fertilizer or detergent
