Biogeochemical Cycles

In the nitrogen cycle, the bacteria that replenish the atmosphere with N2 are

• Denitrifying bacteria

• Nitrogen-fixing bacteria

• Nitrifying bacteria

• Ammonifying bacteria

Carbon dioxide is returned to the atmosphere primarily by

• consumption by animals

• combustion and cellular respiration by consumers

• elimination of waste by animals

• photosynthesis by producers

How does carbon dioxide return to the atmosphere?

• Photosynthesis

• Combustion and Cellular Respiration

• Consumption

• Decomposition

Which one of these is not a way that carbon cycles?

• Transpiration

• Photosynthesis

• Cellular Respiration

• Burning Fossil Fuels

What is the main thing that carries out Nitrogen Fixation?

• Lightning

• Bacteria

• Plants

• Humans

How do non-human living things affect the carbon cycle (fill in the blank/short answer)

• animals do cellular respiration

• plants do photosynthesis

• Fires release carbon into the atmosphere

• All of the above

Describe how human's negatively impact the water cycle (short answer- need detail)

• Pollution

• Deforestation

• Building on and paving areas

• All of the above

How do non-human living things participate in the nitrogen cycle? (fill in the blank/short answer)

• Bacteria decompose organic matter (decomposition)

• animals move nitrogen during consumption

• Bacteria convert waste into ammonia (ammonification)

• All of the above

Describe how humans negatively impact the Carbon Cycle (short answer- need detail)

• Cutting down trees

• Eating plants

• Combustion (putting CO2 into the atmosphere)

• Cellular Respiration

The process of plants losing water through their leaves is called ____.

• condensation
• evaporation
• transpiration
• exhaling