Nitrogen Cycle Quiz

What is the primary gas that makes up Earth's atmosphere?

• Oxygen

• Carbon Dioxide

• Nitrogen

• Hydrogen

What is the process called where nitrogen-fixing bacteria convert nitrogen gas into ammonia?

• Ammonification

• Nitrogen Fixation

• Assimilation

• Denitrification

Which enzyme is responsible for the conversion of nitrogen gas into ammonia?

• Amidase

• Dehydrogenase

• Nitrogenase

• Nitrase

During which step do plants consume nitrates to create amino acids?

• Assimilation

• Denitrification

• Nitrogen Fixation

• Ammonification

What is the final step of the nitrogen cycle?

• Denitrification

• Nitrogen Fixation

• Assimilation

• Ammonification

What can high concentrations of nitrogen compounds lead to?

• Decreased biodiversity

• Enhanced plant growth

• Toxicity

• Increased oxygen levels

What happens to nitrates during the denitrification process?

• They are absorbed by plants

• They are released as nitrogen gas

• They are converted to ammonia

• They are transformed into proteins

What is the role of nitrogen-fixing bacteria in the nitrogen cycle?

• To release nitrogen gas into the atmosphere

• To absorb nitrates from the soil

• To convert nitrogen gas into ammonia

• To decompose dead organisms

How do plants take up nitrates?

• Through their stems

• Through their flowers

• Through their leaves

• Through their roots

What can excessive nitrogen in ecosystems cause?

• Harm to other organisms

• Balanced growth of all organisms

• Increased oxygen levels

• Decreased plant growth