Cycles of Matter Worksheet
Grade 12 Science worksheet covering the carbon, nitrogen, and phosphorus cycles, including their processes, components, and human impacts.
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Cycles of Matter
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Read each question carefully and answer to the best of your ability. Refer to your knowledge of biogeochemical cycles.
1. Which of the following processes releases carbon dioxide into the atmosphere?
Photosynthesis
Respiration
Carbon fixation
Decomposition of inorganic matter
2. The process by which atmospheric nitrogen is converted into ammonia by bacteria is called .
3. Plants absorb nitrogen in the form of nitrates and from the soil.
4. Describe two ways human activities impact the phosphorus cycle. Provide specific examples.
5. The water cycle is directly linked to the movement of carbon and nitrogen through ecosystems.
True
False
6. Analyze the diagram of the carbon cycle below. Identify and explain the role of two different reservoirs and two different fluxes.
7. Match each nitrogen cycle process on the left with its description on the right.
a. Nitrification
i. Conversion of nitrate to atmospheric nitrogen gas
b. Denitrification
ii. Conversion of ammonia to nitrate
c. Ammonification
iii. Decomposition of organic nitrogen into ammonia