Biogeochemical Cycles Test

Which of the following is a key process in the nitrogen cycle?

• Photosynthesis
• Nitrogen fixation
• Evaporation
• Carbon sequestration

Which human activity contributes most to the release of carbon dioxide?

• Agriculture
• Deforestation
• Burning fossil fuels
• Using fertilizers

How do animals contribute to the phosphorus cycle?

• By releasing phosphorus into the air
• By consuming plants and then excreting phosphorus in waste
• By fixing phosphorus in the soil
• By decomposing into phosphate

The process of converting nitrogen gas into ammonia by bacteria is called:

• Ammonification
• Nitrification
• Denitrification
• Nitrogen fixation

Phosphorus is a key element in which biological molecule?

• Proteins
• Carbohydrates
• DNA
• Lipids

What role do plants play in the carbon cycle?

• They decompose carbon
• They release carbon dioxide
• They absorb carbon dioxide during photosynthesis
• They store nitrogen

________ is the process where liquid water turns into water vapor due to heat from the sun.

• Condensation
• Transpiration
• Sublimation
• Evaporation

The only organisms that can fix atmospheric nitrogen into chemical compounds are _____________.

• humans
• legumes
• rocks
• bacteria

_________ is water released from clouds in the form of rain, freezing rain, sleet, snow, or hail.

• Condensation
• Precipitation
• Evaporation
• Sublimation

Most precipitation falls as _________.

• Snow
• Freezing Rain
• Rain
• Hail