Nitrogen Cycle Worksheet
An 11th-grade science worksheet covering the key processes and components of the nitrogen cycle.
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Nitrogen Cycle Worksheet
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Read each question carefully and answer to the best of your ability. Refer to the diagram of the nitrogen cycle if needed.
1. Which process converts atmospheric nitrogen (N₂) into ammonia (NH₃) or ammonium (NH₄⁺)?
Nitrification
Denitrification
Nitrogen Fixation
Ammonification
2. What is the primary role of decomposers in the nitrogen cycle?
Nitrogen fixation
Ammonification
Denitrification
Nitrification
3. The conversion of nitrates (NO₃⁻) back into atmospheric nitrogen (N₂) is called .
4. Plants absorb nitrogen primarily in the form of and ions from the soil.
5. All nitrogen-fixing bacteria live in symbiotic relationships with plants.
True
False
6. Lightning can contribute to nitrogen fixation.
True
False
7. Describe the role of nitrifying bacteria in the nitrogen cycle.
8. Explain how human activities can disrupt the natural balance of the nitrogen cycle.