March 29 Part 3

Which of the following is not a form of particulate phosphorus?

• Adenosine diphosphate (ADP)

• Hydroxyapatite

• Phosphorus adsorbed in dead particulate organic matter

• Orthophosphate

Which of the following is not a form of dissolved phosphorus?

• Orthophosphate

• Polyphosphate

• Phosphate esters

• Hydroxyapatite

_____ is the least abundant element of the major nutrients required for algal growth in a large majority of fresh waters

• Carbon

• Nitrogen

• Phosphorus

• Hydrogen

The main reservoirs of phosphorus are _____

• Atmospheric deposition

• Rock deposits

• Volcanic eruptions

• Wetfall

Which of the following forms of phosphorus in soil is directly available for plant assimilation?

• Organic phosphorus

• Inorganic phosphorus

• Adsorbed phosphorus

• Mineralized phosphorus

Which of the following refers to the conversion of organic phosphorous to H₂PO₄^- or HPO₄^- by microbial activity?

• Mineralization

• Sedimentation

• Decomposition

• Weathering

Small amount of phosphorous is returned to lithosphere from ocean by marine birds’ excreta known as ______, which contains plenty of phosphorous

• Isinglass

• Orthophosphate

• Guano

• Phosphine

Which of the following refers to the movement of deep waters to the surface, bringing phosphates from the dark depths to shallow waters, where light is available to drive photosynthesis

• Tidal bore

• Salt wedge

• Upwelling

• Coriolis effect

The global phosphorus cycle is unique among the major biogeochemical cycles in having no significant atmospheric component except for ______

• Precipitation as rain

• Airborne transport in soil dust

• Volcanic eruption

• Internal cycling

The major source of free oxygen that supports life is the _____

• Atmosphere

• Ocean

• Sediment

• Respiration of autotrophs