Lesson 3: Matter Cycles

What is the main thing that carries out Nitrogen Fixation?

• Lightning

• Bacteria

• Plants

• Humans

What role do humans and other living things play in the nitrogen cycle?

• they burn fossil fuels releasing nitrogen into the atmosphere

• they store nitrogen in their bodies and release it into the ground when they die

• they consume large amounts of nitrogen, preventing it from reacting with other atoms in the atmosphere

• animals play no role in the nitrogen cycle

Which processes help to cycle carbon through ecosystems?

• cellular respiration and photosynthesis

• photosynthesis and transpiration

• transpiration and the calvin cycle

• calvin cycle and krebs cycle

The release of water vapor from plants is called

• combustion

• transpiration

• evaporation

• condensation

Clouds are formed from

• precipitation and evaporation.

• evaporation and condensation.

• transpiration and evaporation.

• infiltration and condensation.

The process that involves bacteria and fungi breaking down large compounds to return smaller molecules to the environment is called

• nitrification.

• decomposition.

• erosion.

• photosynthesis.

In the carbon cycle, producers take in the gas called__

• carbon dioxide
• oxygen
• nitrogen
• carbon monoxide

The process that changes atmospheric nitrogen into nitrogen compounds that are usable

• precipitation

• nitrogen fixation

• photosynthesis

• nitrogen conversion

Which of the following is NOT true about systems that cycle matter?

• Living things play a role in the cycling of matter

• Matter changes form as it cycles

• Some matter is destroyed as it cycles through the environment

• Matter is constantly cycling throughout the envirnoment

Describe how you are involved in both the carbon and oxygen cycles.

Answer explanation

When I breath in I am removing oxygen from the atmosphere and when I exhale I am putting carbon dioxide into the atmosphere.