NITROGEN Cycle Quiz

What is the process by which nitrogen gas is converted into ammonia by nitrogen-fixing bacteria?

• Ammonia conversion

• Nitrogen fixation

• Nitrogen alteration

• Nitrogen transformation

Which process involves the conversion of ammonia into nitrites and then into nitrates by nitrifying bacteria?

• Nitrification

• Photosynthesis

• Ammonification

• Denitrification

What is the term for the process by which plants and animals take up nitrogen compounds to use in their biological processes?

• Hydrogen fixation

• Oxygen fixation

• Nitrogen fixation

• Carbon fixation

What is the process by which organic nitrogen compounds in dead organisms and waste products are converted into ammonia by decomposers?

• Ammonization

• Nitrogenation

• Decomposition

• Ammonification

Which process involves the conversion of nitrates back into nitrogen gas by denitrifying bacteria?

• Photosynthesis

• Nitrogen fixation

• Cellular respiration

• Denitrification

What is the main source of nitrogen for the nitrogen cycle?

• Ocean water

• Volcanic eruptions

• Coal combustion

• Atmospheric nitrogen (N2) gas

Which type of bacteria are responsible for nitrogen fixation?

• Nitrogen-fixing bacteria

• Hydrogen-fixing bacteria

• Oxygen-fixing bacteria

• Carbon-fixing bacteria

What are the two types of nitrifying bacteria involved in the nitrification process?

• Bacillus and Clostridium

• Nitrosomonas and Nitrobacter

• E. coli and Salmonella

• Streptococcus and Staphylococcus

What are the environmental factors that can affect the rate of denitrification?

• Soil color, plant species, and elevation

• Water quality, air pressure, and noise pollution

• Temperature, oxygen levels, pH, organic matter, and microbial activity

• Wind speed, humidity, and sunlight exposure