Lecture 4.1a

What does the Carbon Cycle describe?

• The movement and conversions of carbon through the environment and organisms

• The movement of water through the environment

• The conversion of nitrogen in the atmosphere

• The cycle of oxygen in the environment

Which natural processes move carbon through the cycle?

• Photosynthesis and respiration

• Evaporation and condensation

• Precipitation and transpiration

• Combustion and deposition

Where can carbon be stored in the environment?

• In carbon sinks such as the ocean and underground as fossil fuels

• In the atmosphere as oxygen

• In the soil as nitrogen

• In the water as hydrogen

What effect does anthropogenic activity have on carbon in the atmosphere?

• It releases more carbon into the atmosphere

• It reduces the amount of carbon in the atmosphere

• It has no effect on carbon levels

• It converts carbon into oxygen

What is the overall chemical equation for photosynthesis?

What type of reaction is photosynthesis?

• Photochemical

• Combustion

• Neutralisation

• Precipitation

What is the energy change (ΔH) for the photosynthesis reaction?

What is the main pigment involved in the photosynthesis process?

• Carotene

• Xanthophyll

• Chlorophyll

• Anthocyanin

What is the primary function of glucose produced in photosynthesis?

• It is used immediately for energy.

• It is converted to starch in plants and glycogen in animals for future use.

• It is released into the atmosphere.

• It is used to produce oxygen.

What is the enthalpy change (ΔH) for the aerobic respiration reaction?

• -2802 kJ/mol

• +2802 kJ/mol

• -1802 kJ/mol

• +1802 kJ/mol