by alex
The nitrogen cycle is a fundamental process that sustains life on Earth by recycling nitrogen through the atmosphere, soil, and living organisms. Understanding this cycle is crucial for grasping how ecosystems function and how human activities impact the environment. Let’s see how much you know about this vital ecological process!
Nitrogen Cycle Quiz Questions Overview
1. What is the process called where atmospheric nitrogen is converted into a form usable by plants?
Nitrogen fixation
Nitrification
Denitrification
Ammonification
2. Which microorganisms are primarily responsible for nitrogen fixation?
Fungi
Bacteria
Algae
Protozoa
3. What is the term for the conversion of ammonia to nitrate?
Nitrification
Nitrogen fixation
Denitrification
Ammonification
4. Which process converts nitrates back into nitrogen gas, releasing it into the atmosphere?
Nitrification
Nitrogen fixation
Denitrification
Ammonification
5. What is the primary form of nitrogen absorbed by plants?
Nitrogen gas (N2)
Ammonia (NH3)
Nitrate (NO3-)
Nitrite (NO2-)
6. Which of the following is NOT a step in the nitrogen cycle?
Nitrogen fixation
Photosynthesis
Nitrification
Denitrification
7. What role do decomposers play in the nitrogen cycle?
Fix nitrogen from the atmosphere
Convert ammonia to nitrite
Break down organic matter to release ammonia
Convert nitrates to nitrogen gas
8. Which form of nitrogen is most commonly found in the atmosphere?
Nitrogen gas (N2)
Ammonia (NH3)
Nitrate (NO3-)
Nitrite (NO2-)
9. How do plants typically obtain the nitrogen they need?
Through nitrogen fixation
By absorbing nitrates from the soil
By absorbing nitrogen gas from the air
Through photosynthesis
10. What is ammonification?
The conversion of nitrate to nitrogen gas
The conversion of ammonia to nitrite
The conversion of organic nitrogen to ammonia
The conversion of nitrogen gas to ammonia
