Carbon, Nitrogen, and Water Cycle

What releases carbon dioxide into the atmosphere?

• Plants

• Animals

• Respiration

• Photosynthesis

• Factories

The burning of fossil fuels has led to a ________ in CO2 in the atmosphere.

• increase

• decrease

What organism removes Carbon Dioxide from the atmosphere?

(a)  

How is Carbon Dioxide removed from our atmosphere?

• Photosynthesis

• Cellular Respiration

How much Nitrogen gas is found in our atmosphere?

• 50-60%

• 60-70%

• 70-80%

• 80-90%

What do roots in legume plants do? (a)   Nitrogen gas.

What form of Nitrogen do non-legume plants use?

• Nitrogen

• Nitrates

• Nitrites

• Denitrification

What organisms in the Nitrogen cycle play a role in changing nitrogen to the various forms?

(a)  

What is the largest reservoir(holding tank) of water on Earth?

(a)  

_______________ is water vapor coming from plants.

• Transpiration

• Evaporation