The Phosphorus Cycle
An educational worksheet for Grade 9 Science students to understand the phosphorus cycle, its stages, and its importance in ecosystems.
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The Phosphorus Cycle
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Read each question carefully and provide your best answer. For multiple-choice questions, circle the correct option.
1. Which of the following is the primary reservoir for phosphorus on Earth?
Atmosphere
Oceans
Rocks and sediments
Living organisms
2. How does phosphorus primarily enter terrestrial ecosystems?
Atmospheric deposition
Volcanic eruptions
Weathering of rocks
Photosynthesis
1. The phosphorus cycle is unique among biogeochemical cycles because it does not involve a significant phase.
2. When organisms die and decompose, phosphorus is returned to the soil or water through the action of .
3. The process by which plants absorb phosphorus from the soil is called .
1. Eutrophication can be caused by an excess of phosphorus in aquatic ecosystems.
True
False
2. Phosphorus is a major component of DNA and RNA.
True
False
1. Briefly explain the role of weathering in the phosphorus cycle.
2. Describe two ways human activities impact the phosphorus cycle.