9.2.1 Carbon Cycle

• Fossil fuels are part of the geosphere and contain carbon.


  True
• Steps in the carbon cycle

  1️⃣ Photosynthesis

  2️⃣ Respiration

  3️⃣ Decomposition

  4️⃣ Combustion
• The atmosphere contains carbon dioxide as a key source of carbon
• Match the processes in the carbon cycle with their descriptions:

  Photosynthesis ↔️ Converts CO2 into organic compounds

  Respiration ↔️ Releases CO2 from organic compounds

  Decomposition ↔️ Breaks down dead organic matter

  Combustion ↔️ Releases CO2 from burning fossil fuels
• Photosynthesis uses sunlight to convert carbon dioxide into organic compounds
• Respiration releases carbon dioxide as a byproduct
• Combustion releases stored carbon as CO2 into the atmosphere.

  True
• Why can cold water dissolve more CO2 than warm water?

  Lower molecular energy
• What role do plants play in the carbon cycle through photosynthesis?

  Store carbon in biosphere
• What is the carbon cycle responsible for in the Earth's system?

  Interchanging carbon compounds
• Which reservoir contains carbon in rocks, minerals, and fossil fuels?

  Geosphere
• The burning of fossil fuels releases stored carbon as CO2
• What type of organisms are primarily responsible for decomposition in the carbon cycle?

  Bacteria and fungi
• Which temperature of water can dissolve more CO2: cold or warm?

  Cold
• What is the primary role of plants in the carbon cycle?

  Photosynthesis
• What type of carbon compounds are produced by plants during photosynthesis?

  Organic carbon compounds
• Match the process with its input and output in animals:

  Respiration ↔️ Organic compounds, oxygen → Carbon dioxide, energy

  Decomposition ↔️ Dead animal bodies → Carbon dioxide, minerals
• Increased atmospheric CO2 levels contribute to global climate change
• The biosphere is a source of carbon in the form of living organisms
• Respiration releases carbon dioxide back into the atmosphere
• Which four reservoirs are involved in the carbon cycle?

  Biosphere, geosphere, hydrosphere, atmosphere
• What type of carbon source is present in the atmosphere?

  Carbon dioxide
• What is the role of photosynthesis in the carbon cycle?

  Removes CO2 from atmosphere
• Henry's Law states that the amount of gas dissolved is proportional to its partial pressure
• Match the aspect with its description:

  Dissolution ↔️ CO2 dissolves into the ocean

  Henry's Law ↔️ Relates gas concentration and pressure

  Temperature ↔️ Cold water dissolves more CO2

  Equilibrium ↔️ Balanced exchange of CO2
• The continuous cycling of carbon is essential for regulating the planet's climate.


  True
• Match the compartment with its primary carbon compounds:

  Atmosphere ↔️ CO2

  Biosphere ↔️ Organic molecules

  Geosphere ↔️ Fossil fuels

  Hydrosphere ↔️ Dissolved CO2
• What is the process called when decomposers break down organic matter and release stored carbon as CO2?

  Decomposition
• Respiration releases CO2 back into the atmosphere.


  True
• The amount of CO2 that can dissolve into ocean water is directly proportional to its partial pressure in the atmosphere.


  True
• Increased CO2 absorption in oceans can increase their acidity.


  True
• Plants act as carbon sinks by storing CO2 in their tissues.

  True
• Decomposition of dead animal bodies releases carbon back into the atmosphere or soil.


  True
• Deforestation reduces the ability of the biosphere to act as a carbon sink.

  True
• What is the carbon cycle defined as?

  Interchange of carbon compounds
• What do plants convert carbon dioxide into during photosynthesis?

  Glucose
• The combustion of fossil fuels releases carbon dioxide into the atmosphere.


  True
• Photosynthesis stores carbon in the biosphere.


  True
• Arrange the following processes in the carbon cycle in the correct order:

  1️⃣ Photosynthesis

  2️⃣ Respiration

  3️⃣ Decomposition

  4️⃣ Combustion
• Decomposition releases carbon dioxide back into the atmosphere or soil.


  True