Effects of Human Activities on the Carbon Cycle

How does deforestation affect the carbon cycle?

• Increases the movement of carbon from the atmosphere into biomass

• Reduces the movement of carbon from the atmosphere into biomass

• Has no effect on the carbon cycle

• Increases the absorption of dissolved carbon dioxide

What is one effect of marine pollution on the carbon cycle?

• Increases phytoplankton populations

• Reduces the absorption of dissolved carbon dioxide

• Enhances the movement of carbon into biomass

• Decreases atmospheric CO₂ levels

What happens to carbon in dead organic matter during aerobic respiration?

• It is gradually released as methane gas

• It is gradually released as CO₂

• It remains in the soil

• It is converted into fossil fuels

What is released during anaerobic respiration in the absence of oxygen?

• Carbon dioxide

• Methane gas

• Oxygen

• Nitrogen

What is the effect of increased dissolved CO₂ concentrations in the sea?

• It makes the sea less acidic.

• It increases the pH of the sea.

• It makes the sea more acidic.

• It has no effect on the sea.

Which of the following is a method to manage the carbon cycle sustainably?

• Increasing fossil fuel use

• Deforestation

• Conservation of biomass carbon stores

• Increasing landfill sites

What is carbon sequestration?

• The release of CO₂ into the atmosphere

• The process of planting trees to remove CO₂ from the atmosphere

• The burning of fossil fuels

• The increase of CO₂ emissions from factories

What is one impact of biomass movements by humans?

• Increase in soil organic matter

• Reduction in soil organic matter and soil erosion

• Decrease in CO₂ emissions

• Increase in water quality

What is the main purpose of Carbon Capture and Storage (CCS)?

• To increase carbon emissions

• To capture carbon and prevent its release into the atmosphere

• To enhance the combustion process

• To reduce water vapor in the atmosphere

Which technology involves capturing carbon before the fuel is used?

• Post-combustion technology

• Pre-combustion technology

• Cryogenic separation

• Graphene adsorption