Chapter 2 Biogeochemical Cycles & Earth System Energy

Which is NOT a process of the water cycle?

• precipitation

• freezing

• transpiration

• evaporation

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

• condensation

• evaporation

• transpiration

• exhaling

Two atoms of nitrogen that is not combined with other elements and found in the atmosphere as gas is _____.

• free nitrogen

• nitrogen compounds

• ammonia

• nitrates

The type of nitrogen that can be used by producers is called _____.

• free nitrogen

• nitrous oxide

• nitrogen gas

• nitrogen compounds

Why do living things need nitrogen?

• To get energy
• To make amino acids
• To make proteins
• To make proteins AND amino acids

Where are denitrifying bacteria found?

• In the soil

• Root nodules

• In dead things

• In the atmosphere

Where are nitrogen-fixing bacteria found?

• In the soil

• Root nodules

• In dead things

• In the atmosphere

What happens during the process of nitrogen-fixation?

• Nitrogen compounds turn into free nitrogen

• Free nitrogen turns into nitrogen compounds

What happens during the process of denitrification?

• Nitrogen compounds turn into free nitrogen

• Free nitrogen turns into nitrogen compounds

What is the only process that removes carbon from the atmosphere?

• combustion

• cellular respiration

• photosynthesis

• decomposition