Which of the following processes removes CO2 from the atmosphere?

A. Respiration
B. Photosynthesis
C. Transpiration
D. Excretion
E. Combustion

Correct Answer: Option B

B. Photosynthesis


Nature does have processes in place to keep atmospheric gases balanced. The respiration of animals adds carbon dioxide to the atmosphere, but photosynthesis removes it. Photosynthesis is the process by which plants create glucose to be used in cellular respiration for energy. Plants take in water and atmospheric carbon dioxide and use sunlight to convert the carbon dioxide and water into glucose, which can be used immediately or stored for later. Plants also produce oxygen as a by-product of photosynthesis. In fact, photosynthesis is the reason oxygen-breathing life was able to develop on Earth at all since Earth used to have no oxygen in the atmosphere before cyanobacteria began performing photosynthesis.