WorksheetsMRSM NITROGEN CYCLE
Total questions: 24
Worksheet time: 11mins
Denitrification...
animals eat the plants and other animals that contain nitrogen and release it through their waste
Bacteria in the soil and lightning in the atmosphere “fix” the nitrogen
nitrogen is released back into the atmosphere from the animal’s waste or decomposers
plants absorb nitrogen through their roots and return it back to the atmosphere
What is Nitrogen support with life
Amino Acids and DNA
Phosphates
Sugars and fats
Oil
Which nitrogen cycle process is occurring when bacteria convert ammonium to nitrite and then into nitrate?
nitrogen fixation
nitrification
denitrification
ammonification
assimilation
Which of these nitrogen cycle processes converts atmospheric nitrogen to a soil form of nitrogen that is usable by plants?
nitrogen fixation
nitrification
denitrification
ammonification
assimilation
What is true about nutrients in the ecosystem (such as water, carbon, and nitrogen)?
They are not affected by humans in the ecosystem.
They cannot be recovered if they are lost in the ecosystem.
They cycle through the ecosystem in different forms to support life.
They are usually only found in one form in the ecosystem to support life.
Is nitrogen in the atmosphere?
YES
NO
Why is denitrification is important?
Removes harmful nitrates from environment
Uses up excess oxygen
Nitrogen is better in the soil than the atmosphere
Nitrates are better for the atmosphere
What need to happen so that the two nitrogen separate?
Wind
Lightning
Rain
Thunder
From where do plants absorb nitrogen?
Water
Air
Soil
Animals
A correct path that Nitrogen could take would be...
Air--> Animals--> Plants--> Bacteria
Air--> Bacteria--> Plants--> Animals
Organisms need nitrogen in order to...
To breathe
To obtain water for growth
To build proteins & DNA
To regulate temperature
Gas that makes up 78% of our atmosphere.
Oxygen
Nitrogen
Hydrogen
Carbon Dioxide
Based on the picture, what is the chemical formula for atmospheric nitrogen?
N
N2
NH3
NO3
Which of these nitrogen cycle processes converts atmospheric nitrogen to a soil form of nitrogen that is usable by plants?
nitrogen fixation
nitrification
denitrification
ammonification
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
Which of these nitrogen molecules would be present in the atmosphere?
NH3
NH4+
NO3-
N2
Which of these nitrogen cycle processes converts atmospheric nitrogen to a soil form of nitrogen that is usable by plants?
nitrogen fixation
nitrification
denitrification
ammonification
assimilation
