Understanding the Phosphorus Cycle

What is the primary source of phosphorus on Earth?

• The atmosphere

• Rocks and minerals

• Oceans

• Plants

Which process releases phosphorus from rocks into the soil?

• Photosynthesis

• Erosion and weathering

• Combustion

• Evaporation

How does phosphorus primarily enter aquatic ecosystems?

• Through atmospheric deposition

• Through runoff from land

• Through volcanic eruptions

• Through animal respiration

Tags

NGSS.MS-LS2-3

Why is phosphorus considered a limiting nutrient in many ecosystems?

• It is abundant in the atmosphere

• It is not required by most organisms

• It is often in short supply relative to demand

• It is toxic to most plants

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NGSS.MS-LS2-3

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which of the following is NOT a way phosphorus is cycled through Earth's systems?

• Through the water cycle

• Through the rock cycle

• Through the carbon cycle

• Through the food chain

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NGSS.MS-LS2-3

NGSS.MS-LS2-1

What role do decomposers play in the phosphorus cycle?

• They fix atmospheric phosphorus

• They release phosphorus from dead organisms back into the soil

• They convert phosphorus into nitrogen

• They store phosphorus in their bodies

Tags

NGSS.MS-LS2-3

Which of the following best explains why phosphorus is essential to life?

• It is a major component of DNA and RNA

• It is used in the formation of proteins

• It is a primary energy source for cells

• It is a key component of chlorophyll

In what form is phosphorus most commonly found in the soil?

Tags

NGSS.MS-LS2-3

How do plants typically absorb phosphorus?

• Through their leaves from the air

• Through their roots from the soil

• Through their stems from water

• Through symbiotic relationships with animals

Tags

NGSS.MS-LS2-1

What human activity is a major contributor to the disruption of the phosphorus cycle?

• Deforestation

• Industrial emissions

• Use of synthetic fertilizers

• Overfishing