WorksheetsCarbon and Nitrogen Cycles
Total questions: 20
Worksheet time: 10mins
What process converts nitrogen gas into a biologically useful (fixed) form?
Respiration
Assimilation
Denitrification
Nitrogen fixation
Which organisms play the largest role in converting nitrogen into various usable forms and back to a gas form?
rabbits
bacteria
plants
worms
How do animals get nitrogen to make important biological molecules?
Breathe it in through the air
Fix it from nitrogen gas
Consume other organisms
Assimilate it through the soil
Which of the following cannot fix nitrogen?
lightning
fertilizer production
combustion
rain
Which of the following is not a possible process that results in ammonification?
photosynthesis
decomposition
nitrogen fixation
fertilizer production
Carbon moves between which two reservoirs through the process of diffusion?
atmosphere & biosphere
atmosphere & lithosphere
lithosphere & biosphere
hydrosphere & atmosphere
What happens to carbon during the process of photosynthesis?
CO2 is released by plants
CO2 is taken up by plants
organic carbon is taken up through plant roots
carbon is lost through heat
All the gases surrounding Earth are known collectively as the...
hydrosphere
biosphere
atmosphere
lithosphere
The process of breathing in oxygen and releasing carbon dioxide into the air (or water) is...
Assimilation
Decomposition
Photosynthesis
Respiration
Which of the following best describes weathering and erosion?
when it rains on rocks
decay of dead organisms
break down of rocks that wash into the water
when a volcano erupts
Which of the following best describes the Greenhouse Effect?
when solar radiation reflects off the atmosphere
heat is retained in Earth's atmosphere by greenhouse gases
plants grow better when a greenhouse is filled with CO2
when solar radiation hits Earth's surface directly
Which gas is most abundant in the atmosphere?
carbon dioxide
methane
nitrous oxide
nitrogen gas
Which of the following does NOT release carbon dioxide into the atmosphere?
volcanic activity
respiration
photosynthesis
fossil fuel combustion
The most abundant Greenhouse Gas in the atmosphere is...
carbon dioxide
nitrogen gas
nitrate
oxygen
The process of making nitrites and nitrates is...
denitrification
nitrogen fixation
nitrification
ammonification
What does denitrification do?
converts fixed nitrogen into nitrogen gas
converts nitrogen gas into fixed nitrogen
makes nitrates
makes ammonia
Which of the following is not a form of fixed nitrogen?
ammonia
nitrogen gas
nitrate
nitrite
Which of the following best describes the movement of nitrogen between reservoirs in the process of assimilation?
from the soil into plants
from the air into plants
from the air into soil
from soil into animals
The process that releases carbon and nitrogen into the soil through decay is...
erosion
photosynthesis
decomposition
assimilation
Which of the following would not be included in the hydrosphere?
ocean
trees
surface water
groundwater
