What is the primary reservoir of phosphorus in the environment?

• Atmoshphere

• Ocean Water

• Sedimentary rocks

• Living Organisms

Which of the following processes releases phosphorus from rocks into the soil?

• Combustion

• Photosynthesis

• Weathering

• Respiration

Which of the following is a sustainable method of managing phosphorus use in agriculture?

• Applying excess fertilizers to ensure crop growth

• Using phosphorus-rich irrigation water

• Recycling animal manure

• Planting the same crop repeatedly

Phosphorus is a key component of which of the following biological molecules?

• Carbohydrates

• Proteins

• ATP

• Lipids

Which organisms help return phosphorus to the soil after the death of plants and animals?

• Herbivores

• Decomposers

• Predators

• Pollinators

Which of the following is NOT a common form of phosphorus in the soil?

• Phosphate ions (PO₄³⁻)

• Nitrite ions (NO₂⁻)

• Organic phosphorus compounds

• Insoluble mineral phosphates

Why is phosphorus considered a limiting nutrient in many ecosystems?

• It evaporates quickly

• It cycles slowly

• It is easily lost to the atmosphere

• It is abundant in all types of soil

What is one environmental concern associated with excess phosphorus from agriculture?

• Soil acidification

• Eutrophication

• Global warming

• Deforestation

Eutrophication due to phosphorus runoff primarily leads to:

• Decrease in atmospheric oxygen

• Algal blooms

• Decreased pH in oceans

• Increase in forest biodiversity

What happens to phosphorus that is not taken up by plants?

• It becomes airborne

• It binds to soil particles

• It leaches deep into groundwater

• It turns into nitrogen