Carbon Cycle

What is the primary role of photosynthesis in the carbon cycle?

• To release CO2 into the atmosphere

• To store carbon in plants

• To break down sugar for energy

• To turn carbon into fossil fuels

Which process releases stored carbon back into the atmosphere as CO2?

• Photosynthesis

• Respiration

• Decomposition

• Combustion

What happens to carbon when plants and animals die?

• It is released into the atmosphere

• It is stored in the soil

• It turns into sugar

• It becomes oxygen

Why does an increase in CO2 cause the atmosphere to heat up?

• CO2 traps heat like a blanket

• CO2 increases oxygen levels

• CO2 decreases sunlight

• CO2 cools the Earth's surface

What human activity in the 19th century significantly increased CO2 levels in the atmosphere?

• Deforestation

• Combustion of fossil fuels

• Photosynthesis

• Decomposition