Carbon Cycle

More CO₂ is released in the atmosphere today than in the past because of the ___________________________.

• oil

• greenhouse

• burning of fossil fuels

• respiration

The __________ is the main regulator of CO₂ in the atmosphere because CO₂ dissolves easily in it.

• coal

• ocean

• natural gas

• greenhouse

Plants use CO₂ in the process of __________ to make _________ and oxygen.

• respiration, methane

• photosynthesis, sugar

• respiration, sugar

• photosynthesis, methane

All of the carbon in existence is continually recycled in the carbon cycle

• True
• False

Which of the following removes carbon from the atmosphere?

• Combustion
• Respiration
• Photosynthesis
• Death

Carbon molecules cannot be created or destroyed

• True

• False

At which number does photosynthesis take place?

• 1

• 2

• 3

• 4

At which number does the burning of fossil fuels take place?

• 4

• 5

• 6

• 7

At which number does the animal respiration take place?

• 1

• 2

• 3

• 4

At which number does the decomposition of living organisms take place?

• 1

• 2

• 3

• 4