AP BIOLOGY

Detailed explanation-1: -The phosphorus cycle is the biogeochemical cycle that describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere.

Detailed explanation-2: -The ocean sediments are therefore by far the greatest reservoirs of phosphorus. In terrestrial ecosystems, much of the available phosphorus moves in a closed cycle between living organisms and the organic debris in the soil.

Detailed explanation-3: -The reservoir of phosphorus in ecosystems is rock, where it is bound to oxygen in the form of phosphate. As phosphate-rich rocks are exposed and eroded, rainwater dissolves the phosphate.

Detailed explanation-4: -The Earth’s atmosphere, oceans, biosphere & lithosphere (crust + uppermost mantle) all act as major reservoirs for carbon. They store carbon and can exchange it with other reservoirs. The lithosphere is by far the Earth’s largest reservoir holding  100, 000, 000 Gt of carbon!

Detailed explanation-5: -The reservoir for gaseous type of nutrient and biogeochemical cycle (nitrogen and carbon cycle) exists in atmosphere while earth crust is the reservoir for sedimentry cycle. Whereas stratosphere ionosphere and lithosphere are the parts of atmosphere.