Biogeochem cycles

What is the main form of atmospheric Nitrogen?

• N2

• NO3

• NH4

• NO2

Nitrogen needs to be 'fixed' so it can be used by organisms. How is this done?

• Lightning

• Photosynthesis

• Bacteria

• Lightning and Bacteria

• Photosynthesis and Bacteria

Which of the following is NOT considered a sink or source of Phosphorus?

• Minerals/soil

• Ocean water

• Atmosphere

• Artificial fertilizers

Phosphorus is important to living things because it

• is used in making bones and teeth

• makes up fats and carbohydrates

• is used in technology

• contains more energy than any other element

Carbon sinks and sources are most severely disturbed by

• recycling

• burning fossil fuels

• using artificial fertilizers

• using renewable resources

Carbon and Nitrogen cycles are similar because

• they both have air, water, and soil sinks/sources

• they both only have water and soil sinks/sources

• neither can be found in organisms

• they both include artificial fertilizers as a sink/source

Carbon is a main building block of which of the following?

• carbohydrates

• lipids

• proteins

• nucleic acids

• all of these

Of the following, which include organisms as part of their natural cycle?

• Nitrogen

• Carbon

• Phosphours

• All of these

When deforestation occurs, which cycle is most directly impacted?

• Nitrogen

• Carbon

• Phosphorus

• All of these

When fossils fuels are burned to make electricity, which of the following are most directly impacted

• Nitrogen

• Carbon

• Phosphorus

• All of these