Water, Carbon, & Nitrogen Cycles

Front

What substance do organisms need to build proteins and DNA?

Back

Nitrogen

Front

Can plants and animals use nitrogen directly from the air?

Back

No, they cannot.

Front

What is the term for when rainwater contributes to the flow of rivers and streams?

Back

Runoff

Front

What is the process called when plants give off water vapor as a waste product?

Back

Transpiration

Front

What is one way nitrogen fixation occurs besides lightning?

Back

Bacteria.

Front

What is the main component of the water cycle?

Back

Evaporation, condensation, and precipitation.

Front

What role does carbon play in living organisms?

Back

It is a key component of organic molecules.

Front

What is the process by which plants absorb carbon dioxide?

Back

Photosynthesis.

Front

What is the term for the conversion of nitrogen gas into a usable form for plants?

Back

Nitrogen fixation.

Front

What is the significance of the nitrogen cycle in ecosystems?

Back

It recycles nitrogen, which is essential for life.