Biogeochemical Cycles (HB 22-23)

What is the most abundant gas in the atmosphere?

• hydrogen
• oxygen
• helium
• nitrogen

What happens during the process of denitrification?

• Nitrogen compounds turn into free nitrogen
• Free nitrogen turns into nitrogen compounds

What happens during the process of nitrogen-fixation?

• Nitrogen compounds turn into free nitrogen
• Free nitrogen turns into nitrogen compounds

Why is the phosphorus cycle different than the other cycles?

• It isnt different

• It does NOT cycle through the atmosphere.

• It only cycles through water

• It only cycles through the atmosphere

Snow, sleet, hail, and rain are all examples of  ________________. 

• evaporation
• condensation
• accumulation
• precipitation

What is it called when plants give off water vapor as a waste product?

• condensation
• evaporation
• sublimation
• transpiration

Matter is recycled within and between ecosystems in __________________ cycles

• biogeochemical

• ecological

• life

• weather

What is it called when water changes from liquid to atmospheric gas?

• transpiration

• condensation

• evaporation

• precipitation

What is it called when water vapor condenses to make clouds?

• transpiration

• condensation

• evaporation

• precipitation

Which of the following organisms plays a major role in all phases of the nitrogen cycle?

• Bacteria
• Fungi
• Plants
• Animals