Phosphorus Cycle

What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?

• nitrogen composition
• ammonia 
• nitrogen fixation
• denitrification

What is the basis of open ocean food webs that provides the majority of the Earth’s oxygen supply?

• ocean coral reefs
• abyssal upwellings
• phytoplankton
• mangrove wetlands

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Phosphorus deposited from guano close to the shore that has been dissolved in the ocean by runoff, and deposited in the ocean floor can be brought to the surface by what phenomena?

• phytoplankton
• zooplankton
• nutrient upwellings
• chemical sublimation

Which nutrient cycle does not have the troposphere in it's processes?

• Nitrogen
• Carbon
• Phosphorus
• Hyrdologic

A large portion of the phosphorus used in fertilizer is derived from

• the guano of ocean-feeding birds
• the decomposition of detritus feeders.
• captured and dried mats of plankton from the Red Sea.
• algal chlorophyll.

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Human disruption often prevents phosphates absorbed by plants from returning to their original soil. Instead, these phosphates accumulate in

• sedimentary rocks
• nuclear waste
• uncultivated land.
• human sewage

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This process is responsible for most environmental problems of excess nitrogen and phosphorus entering streams, lakes and oceans.

• decomposition
• emissions from automobiles
• agriculture and house hold runoff
• photosynthesis

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Which of the following is known as the "sedimentary" cycle because its reservoir is sedimentary rock?

• Sulfur cycle
• Nitrogen cycle
• Phosphorus cycle
• Carbon cycle

In terms of geological time, most fossil fuels were deposited during the _______ period.

• Precambrian
• Jurassic
• Carboniferous
• Triassic

Phosphorous is needed in organisms for the production of

• ADP and ATP.
• Cellular membranes.
• Deoxyribonucleic and ribonucleic acids.
• All of the answers are correct