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WorksheetsCAX IGCSE Biol The nitrogen cycle
Total questions: 20
Worksheet time: 10mins
What converts nitrogen gas into a usable form for plants and animals?
bacteria
rain
fungi
car exhaust
The process in which nitrogen circulates and is recycled is called
The nitrogen cycle
The carbon cycle
The water cycle
The phosphorus cycle
Organisms that need nitrogen to survive are....
only plants
only animals
only bacteria
all living things
How is nitrogen "fixed" into a usable form for plants?
Through action of bacteria only
Through lightning only
Through action of bacteria and lightning
Through photosynthesis
How do animals get the nitrogen they need?
From the air they breathe
From the water they drink
From the food they eat
From the sun
Gas that makes up 78% of our atmosphere.
Oxygen
Nitrogen
Hydrogen
Carbon Dioxide
What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?
nitrogen composition
nitrogen fixation
ammonia
denitrification
What is the formula for atmospheric nitrogen?
N
N2
NH3
NO3
What process occurs when dead plant and animal matter decomposes and nitrogen is released back into the atmosphere?
Assimilation
Fixation
Ammonification
Denitrification
Plants and animals cannot use nitrogen directly from the air.
True
False
According to this diagram, plants use nitrogen to make _________________________
bacteria
animals
proteins
decomposers
According to this diagram, plants absorb
nitrates
nitrogen fixing bacteria
animals
decomposers
According to this diagram, animals get proteins from eating ________________________
decomposers
bacteria
plants
sunlight
The process that allows organisms to use nitrogen
assimilation
denitrification
fixation
ammonification
A correct path that nitrogen could take would be
air -> animals -> plants -> bacteria
animals -> air -> bacteria -> plants
bacteria -> air -> plants -> animals
air -> bacteria -> plants -> animals
Bacteria fix nitrogen from the atmosphere into a form plants can use.
True
False
Bacteria create a form of nitrogen that animals can use directly.
True
False
What do free living bacteria in the soil do?
Make clouds
Turn atmospheric nitrogen into nitrates
Make carbon dioxide for plants to go through photosynthesis
Help plants take in water
In the nitrogen cycle, what does label A in the diagram represent?
Gas
Clouds
Carbon dioxide in the atmosphere
Nitrogen in the atmosphere
All plants have nitrogen fixing bacteria in their roots.
True
False
