Biogeochemical Cycles

What is this a picture of?

• Nitrogen cycle
• carbon cycle
• water cycle
• plant cycle

How does N2 get into soil?

• N2 diffuses into the pore spaces between the soil particles
• Legumes pull it in.
• gravity.  It's not just a good idea, it's the Law.
• 1st Law of Thermodynamics

How does carbon dioxide leave the atmosphere?

• Through transpiration
• Through photosynthesis
• Through factory emission
• Sunlight

Which process takes Carbon Dioxide from the air and converts it into a form of carbon used by living things?

• Precipitation
• Photosynthesis
• Respiration
• Bioremdiation

These gases, such as carbon dioxide, trap heat in the Earth's atmosphere causing global warming

• Global warming gases
• Hot House gases
• Green House gases
• Thermal pollution

The elements carbon, oxygen, hydrogen and nitrogen combined make up about 96% of our bodies (carbon is about 18%).  Carbon is necessary for life because it is a(n)

• uncommon element in all living things.
• element found only in the atmosphere
• excellent bonder
• is found mostly in dead things.

Respiration is the process by which ____________ is consumed and _______________ is produced.

• Carbon, Oxygen
• Oxygen, Carbon dioxide
• H20, oxygen
• Carbon, H2O

A particular golf course is using large amounts of nitrogen fertilizer. What process could move this nitrogen into a local stream?

• volatilization
• nitrogen fixation
• runoff
• ammonification

Growing legumes such as alfalfa or soy beans increases

• denitrification
• nitrogen fixation
• ammonification
• ammonium oxidation

Which of the following describes the role of nitrogen-fixing bacteria in the nitrogen cycle? Nitrogen-fixing bacteria convert

• nitrates intro nitrogen gas
• ammonia into proteins
• nitrogen gas into ammonia
• proteins into nitrates