Carbon Dioxide

Definition

Carbon dioxide (CO2) is a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis.

Related terms

Photosynthesis: The process used by plants, algae and certain bacteria to harness energy from sunlight into chemical energy.

Cellular Respiration: A set of metabolic reactions taking place in cells to convert biochemical energy from nutrients into adenosine triphosphate (ATP), releasing waste products including CO2.

Stomata: Tiny openings or pores in plant leaves where carbon dioxide can enter for photosynthesis.