Nitrogen Cycle Worksheet
A comprehensive worksheet for Grade 10 students to assess their understanding of the nitrogen cycle, including its stages, organisms involved, and environmental impact.
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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 provided diagram where applicable.
Figure 1: The Nitrogen Cycle
1. Which of the following processes converts atmospheric nitrogen (N₂) into ammonia (NH₃)?
Nitrification
Denitrification
Nitrogen Fixation
Ammonification
2. What role do decomposers play in the nitrogen cycle?
Convert nitrates to atmospheric nitrogen
Fix atmospheric nitrogen into ammonia
Break down organic matter and release ammonia
Absorb nitrates directly from the soil
3. The process by which ammonia is converted to nitrites and then to nitrates is called .
4. Plants absorb nitrogen mainly in the form of from the soil.
5. bacteria are responsible for converting nitrates back into atmospheric nitrogen.
6. Lightning can convert atmospheric nitrogen into usable forms for plants.
True
False
7. Animals obtain nitrogen by directly absorbing it from the atmosphere.
True
False
8. Describe the importance of the nitrogen cycle for living organisms.
9. Explain how human activities can impact the natural nitrogen cycle.
Match each term on the left with its correct definition on the right.
10. Ammonification
a. Conversion of nitrates to atmospheric nitrogen
11. Nitrification
b. Conversion of ammonia to nitrites and nitrates
12. Denitrification
c. Decomposition of organic matter to ammonia
13. Assimilation
d. Absorption of nitrates by plants