WorksheetsCarbon and Nitrogen Cycles
Total questions: 13
Worksheet time: 39mins
Which of the following most completely describes the role of nitrogen-fixing bacteria in the nitrogen cycle? Nitrogen-fixing bacteria convert
nitrates intro nitrogen gas
ammonia into proteins
molecular nitrogen gas into ammonia into nitrites and nitrates
nitrites into nitrates
Combustion
Respiration
Photosynthesis
Death
What do legumes have on their roots?
nodules full of nitrogen fixing bacteria
nodules full of seeds
nodules full of carbon dioxide
nodules full of trace gases
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
The process of breathing in oxygen and releasing carbon dioxide into the air (or water) is...
Assimilation
Decomposition
Photosynthesis
Respiration
Which of the following does NOT release carbon dioxide into the atmosphere?
volcanic activity
respiration
photosynthesis
fossil fuel combustion
Carbon
Nitrogen
Phosphorus
Water
Carbon
Nitrogen
Phosphorus
Water
