Week 21: The Carbon Cycle

What is the likelihood that the carbon atoms in your body have been part of someone else before?

• Very likely

• Unlikely

• Impossible

• Rare

What is the term for the conversion of organic material into fossil fuels?

• Respiration

• Photosynthesis

• Fossilization

• Decomposition

Which process in the carbon cycle involves the conversion of organic compounds back into carbon dioxide?

• Photosynthesis

• Respiration

• Feeding

• Dissolving

What is the role of combustion in the carbon cycle?

• To release CO₂ into the atmosphere

• To convert CO₂ into organic matter

• To dissolve CO₂ in water

• To break down dead organisms

What is the role of respiration in the carbon cycle?

• It removes carbon from the atmosphere.

• It returns carbon to the atmosphere.

• It dissolves carbon in water.

• It converts carbon into fossil fuels.

Which process in the carbon cycle involves the breakdown of dead organisms?

• Photosynthesis

• Respiration

• Decay

• Combustion

Which process in the carbon cycle is directly associated with animals eating plants?

• Respiration

• Feeding

• Decay

• Combustion

What is the process by which carbon is returned to the atmosphere through the decomposition of organic matter?

• Photosynthesis

• Respiration

• Decay

• Combustion

What is the role of photosynthesis in the carbon cycle?

• It releases carbon into the atmosphere.

• It converts carbon dioxide into organic compounds.

• It dissolves carbon in water.

• It breaks down dead organisms.

Which process in the carbon cycle involves the conversion of organic matter into fossil fuels?

• Combustion

• Respiration

• Fossilisation

• Decay