4.3 Carbon Cycling

How much of the atmosphere is made up of carbon dioxide?

• 21%

• 78%

• 0.04%

• 1%

Which of the following do NOT release carbon dioxide into the atmosphere

• Planting new trees

• Cellular Respiration

• Burning of Fossil Fuels

• Deforestation

What does carbon dioxide react to become when dissolved in water?

• Bicarbonate and hydrogen ions

• Oxygen and methane

• Nitrous oxides and sulfuric acid

• Oxygen and hydrogen dioxide

How can early levels of carbon dioxide be predicted?

• Ice cores

• Measuring air pressure

• Swamps

• Examining ocean corals

Review: Which of the following is a saprotroph?

• A plant that lives in a symbiotic relationship with another organism

• A mushroom that feeds on dead objects

• photosynthetic bacteria

• An animal that eats only plants

Which of the following does NOT store carbon?

• Atmosphere

• Living organisms

• Clouds

• Ocean

• Fossil fuels

In the oceans; algae, plants, and other organisms use carbon from the atmosphere for ________________.

• respiration

• decomposition

• transpiration

• photosynthesis

Which of the following add carbon dioxide to the atmosphere?

• volcanoes
• combustion of fossil fuels
• animal and plant respiration
• all of these

What process occurs when coal (fossil fuel) is used for energy?

• Decomposition
• Combustion
• Pressurization 
• Respiration 

Organisms that die in the ocean may __________ to the bottom and form limestone rock of a period of time.

• sink

• float

• rise

• increase