7.2.2 The Carbon Cycle

• The carbon cycle involves the movement of carbon through the atmosphere, oceans, land, and living organisms
• Respiration releases carbon dioxide into the atmosphere and is essential for energy production
• Combustion releases carbon dioxide into the atmosphere and contributes to the greenhouse
• Atmospheric carbon dioxide is absorbed by plants during photosynthesis.

  True
• Order the processes in the carbon cycle based on their role:

  1️⃣ Photosynthesis (absorbs CO2)

  2️⃣ Respiration (releases CO2)

  3️⃣ Decomposition (releases CO2)

  4️⃣ Combustion (releases CO2)
• Respiration releases carbon dioxide and is essential for energy production.


  True
• Fossil fuels are carbon-rich deposits formed from ancient organic matter.


  True
• The carbon sequestered during photosynthesis is stored in the plant's biomass.


  True
• Respiration is a key process in the carbon cycle for returning carbon to the atmosphere.


  True
• What is the carbon cycle essential for on Earth?

  Sustaining life
• Photosynthesis absorbs carbon dioxide from the atmosphere and produces oxygen.

  True
• Decomposers release carbon dioxide into the atmosphere and soil
• Match the process with its role in the carbon cycle:

  Photosynthesis ↔️ Absorbs CO2 from the atmosphere

  Respiration ↔️ Releases CO2 into the atmosphere

  Decomposition ↔️ Returns carbon to the environment

  Combustion ↔️ Increases atmospheric CO2 levels
• Carbon stored in living and dead organisms is referred to as organic matter
• What is the process of carbon sequestration in photosynthesis?

  Removing CO2 from atmosphere
• Decomposers release carbon dioxide during decay.

  True
• Order the following processes in the carbon cycle based on their carbon flow:

  1️⃣ Atmospheric CO2 is absorbed by plants during photosynthesis

  2️⃣ Plants store carbon in glucose

  3️⃣ Organisms release CO2 during respiration

  4️⃣ Decomposers break down dead organic matter

  5️⃣ Fossil fuels release CO2 during combustion
• Organic matter stores carbon in living and dead organisms.


  True
• The carbon cycle involves the continuous cycling of carbon between the atmosphere, living organisms, and the Earth's surface
• Photosynthesis is a form of carbon sequestration.


  True
• Respiration releases carbon dioxide and water, consuming oxygen
• Which decomposers are involved in the decomposition process?

  Bacteria and fungi
• Decomposition transforms complex organic compounds into simpler forms, including carbon dioxide.

  True
• Combustion contributes to climate change by releasing excess CO2
• What is the primary human-caused source of carbon emissions?

  Fossil fuel combustion
• Ocean acidification is one consequence of an imbalanced carbon cycle.

  True
• Photosynthesis absorbs carbon dioxide from the atmosphere and produces oxygen.

  True
• Decomposition returns carbon to the environment and recycles nutrients.


  True
• Match the carbon source with its description:

  Atmospheric carbon dioxide ↔️ Primary form of carbon in the atmosphere

  Organic matter ↔️ Carbon stored in living and dead organisms

  Fossil fuels ↔️ Carbon-rich deposits formed from ancient organisms
• Fossil fuels are formed from the remains of ancient organisms
• Plants use sunlight during photosynthesis to convert CO2 into glucose
• Atmospheric carbon dioxide is the primary form of carbon in the atmosphere
• During photosynthesis, plants use sunlight to convert CO2 and water into glucose and oxygen
• Respiration releases carbon dioxide into the atmosphere, which can then be used by plants during photosynthesis
• Photosynthesis absorbs carbon dioxide from the atmosphere and produces oxygen
• The carbon cycle involves the movement of carbon through the atmosphere, oceans, land, and living organisms
• What gas is released into the atmosphere during respiration?

  Carbon dioxide
• Combustion increases atmospheric carbon dioxide levels.


  True
• What is the primary form of carbon in the atmosphere?

  Carbon dioxide
• Maintaining a balance between carbon sources is crucial for sustaining life on Earth.


  True