Bacteria and the Nitrogen Cycle Quiz

Which group of bacteria is primarily responsible for the process of nitrogen fixation in the nitrogen cycle?

• Nitrifying bacteria

• Denitrifying bacteria

• Nitrogen-fixing bacteria

• Ammonifying bacteria

What is the role of nitrifying bacteria in the nitrogen cycle?

• Convert nitrogen gas into ammonia

• Convert ammonia into nitrites and nitrates

• Convert nitrates into nitrogen gas

• Decompose organic matter

Which bacteria convert nitrates back into nitrogen gas, completing the nitrogen cycle?

• Nitrogen-fixing bacteria

• Nitrifying bacteria

• Denitrifying bacteria

• Ammonifying bacteria

What is the primary function of ammonifying bacteria in the nitrogen cycle?

• Convert ammonia into nitrites

• Convert organic nitrogen into ammonia

• Convert nitrates into nitrogen gas

• Fix atmospheric nitrogen

Which of the following processes is NOT directly performed by bacteria in the nitrogen cycle?

• Nitrogen fixation

• Nitrification

• Denitrification

• Photosynthesis

In the nitrogen cycle, which form of nitrogen is directly usable by most plants?

Which group of bacteria is involved in the conversion of nitrites to nitrates?

• Nitrogen-fixing bacteria

• Nitrifying bacteria

• Denitrifying bacteria

• Ammonifying bacteria

What is the chemical formula for ammonia, a compound involved in the nitrogen cycle?

Which process in the nitrogen cycle is primarily responsible for returning nitrogen to the atmosphere?

• Nitrogen fixation

• Nitrification

• Denitrification

• Ammonification

What is the main source of nitrogen for nitrogen-fixing bacteria?

• Nitrates in the soil

• Nitrogen gas in the atmosphere

• Ammonia in the soil

• Organic matter