WorksheetsNitrogen Cycle Quiz
Total questions: 10
Worksheet time: 5mins
What is nitrogen cycle?
A biochemical process through which nitrogen is converted into many forms.
A process that only occurs in plants.
A method of nitrogen storage in the atmosphere.
A chemical reaction that does not involve living organisms.
What makes it support life?
Nitrogen is essential for building important molecules.
Nitrogen is harmful to living organisms.
Nitrogen has no role in supporting life.
Nitrogen is only needed by plants.
What are the essential molecules that need nitrogen?
Proteins, DNA & RNA, Chlorophyll
Water, Carbohydrates, Lipids
Vitamins, Minerals, Sugars
Fats, Oils, Starches
What is the initial step of the nitrogen cycle?
Fixation
Nitrification
Assimilation
Ammonification
What happens during nitrification?
Ammonia is converted into nitrate.
Nitrogen is fixed into ammonia.
Organic matter is decomposed.
Plants absorb nitrogen.
What is assimilation in the nitrogen cycle?
Plants take in nitrogen compounds from the soil.
Nitrogen is released back into the atmosphere.
Bacteria convert ammonia into nitrate.
Decomposers break down organic matter.
What occurs during ammonification?
Nitrogen is released back into the soil.
Plants absorb nitrogen.
Nitrate is converted into ammonia.
Nitrogen is fixed into organic matter.
Which process in the nitrogen cycle converts atmospheric nitrogen (N₂) into a form usable by plants?
Denitrification
Nitrification
Nitrogen fixation
Ammonification
What is the role of nitrifying bacteria in the nitrogen cycle?
They convert ammonia into nitrogen gas.
They convert nitrates into nitrogen gas.
They convert ammonia into nitrites and nitrates.
They fix nitrogen from the atmosphere.
Which step of the nitrogen cycle returns nitrogen to the atmosphere?
Nitrogen fixation
Nitrification
Assimilation
Denitrification
