Phosphorus cycle

What is the phosphorus cycle?

The movement of phosphorus through the biosphere, lithosphere, hydrosphere, and organisms.

Why is phosphorus important for living organisms?

It is essential for DNA, RNA, ATP, cell membranes, plant growth, and strong bones and teeth in animals.

How does phosphorus naturally enter the soil?

Through the weathering of rocks which releases phosphate minerals into soil and water.

What is eutrophication?

The overgrowth of algae in water bodies due to excess nutrients, particularly phosphorus.

What impact does eutrophication have on aquatic ecosystems?

It causes rapid algae growth, deoxygenation when algae die and decompose, which can kill fish.

What role do decomposers play in the phosphorus cycle?

Decomposers break down organic matter, returning phosphorus to the soil.

How does human agriculture impact the phosphorus cycle?

Farmers use phosphate-based fertilizers that can wash into water bodies, causing eutrophication.

What is the main form of phosphorus in the phosphorus cycle?

Phosphate (PO₄³⁻) is the main form of phosphorus in the cycle.

What occurs during sedimentation in the phosphorus cycle?

Phosphates settle to form new sedimentary rocks.

What happens during geological uplift in the phosphorus cycle?

Phosphorus-rich rocks are brought back to the surface over millions of years.

What distinguishes the phosphorus cycle from the carbon and nitrogen cycles?

Phosphorus does not have a gaseous form and mainly cycles through soil, water, and living organisms.

What are the major components of the phosphorus cycle?

Weathering of rocks, absorption by plants, consumption by animals, decomposition, and sedimentation.

How does plant absorption relate to the phosphorus cycle?

Plants absorb phosphorus from the soil, which is essential for building organic molecules like DNA and ATP.

What is the effect of deforestation on the phosphorus cycle?

It removes plants that hold phosphorus in the soil, leading to increased soil erosion and nutrient loss.